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  • Latency in TCP/IP-over-Ethernet networks

    - by aix
    What resources (books, Web pages etc) exist out there that: explain the causes of latency in TCP/IP-over-Ethernet networks; mention tools for looking out for things that cause latency (e.g. certain entries in netstat -s); suggest ways to tweak the Linux TCP stack to reduce TCP latency (Nagle, socket buffers etc). The closest I am aware of is this document, but it's rather brief. Alternatively, you're welcome to answer the above questions directly.

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  • Plesk Postfix Mail Server 9.5.4 very heavy load, 1000s of processes

    - by Eugene van der Merwe
    Our Plesk Linux Ubuntu 64-bit mail server has extremely high load and we don't know how to isolate it. The load was okay will two weeks ago but in the last two weeks it's seriously deteriorated. The mail server has been running for years and we have had sporadic performance issues. Normally we reduce the load by turning off all SPAM checks until the problem is sorted (which sometimes resolves itself). Currently we have turned of real time block lists, SPF checking and we have attempted to turn off SpamAssassin. No matter what we do the SpamAssassin check box stays ticked in the GUI. Out of desperation we have done /etc/init.d/psa-spamassassin stop. For years we haven't been able to do SpamAssassin because it kills the server. We would like to use it but performance is more important for now. We cannot turn off Greylisting. The moment we turn off Greylisting our help desk is inandated with calls. Out of desperation we investigated truncating the Greylisting database which is now 2.5 GB big but we abandoned this after noticing turning of Greylisting doesn't improve the performance at all. We have no anti-virus. It's just more load and Dr. Web never really worked that well for us. But we'll try that if it will make a difference. We have implemented Postfix Anvil. This seems to have made the situation worse so we disabled it. We’re not sure if this is the case. Our current mail server is configured to forward all SMTP to a relay server. We did so to reduce the load. This helped a lot because outgoing queues are generally empty. We are running in an Expand configuration. The mail server has about 12 000 accounts of which maybe half are active. We have read through this document: http://www.postfix.org/STRESS_README.html but there are too many settings and we don’t know which ones to choose. Please assist urgently. We need advice on how to fix this problem before all our clients abandon is. The only clue we have is that there are 100s of these processes: 30 13205 1 0 13:18 ? 00:00:00 /usr/lib/plesk-9.0/postfix-queue 127.0.0.1 10027 before-queue 30 13207 1 0 11:38 ? 00:00:00 /usr/lib/plesk-9.0/postfix-queue 127.0.0.1 10027 before-queue 30 13208 1 0 13:18 ? 00:00:00 /usr/lib/plesk-9.0/postfix-queue 127.0.0.1 10026 before-remote 30 13209 1 0 11:38 ? 00:00:00 /usr/lib/plesk-9.0/postfix-queue 127.0.0.1 10026 before-remote 30 13213 1 0 13:18 ? 00:00:00 /usr/lib/plesk-9.0/postfix-queue 127.0.0.1 10027 before-queue

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  • What can be done in Windows 7 that can't be done in Windows XP?

    - by emddudley
    In Jeff Atwood's latest blog entry on Windows 7 he talks about getting people to move off Windows XP. What, specifically, can be done in Windows 7 that cannot be done in Windows XP? I'm not looking for usability or GUI improvements, unless they happen to significantly reduce the time that it takes to perform tasks that were previously prohibitively time consuming.

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  • overusage of RAM in Hypervm VPS

    - by Mac Taylor
    hey guys I have a VPS running on hypervm in proceses list i have something like this > /usr/libexec/mysqld --basedir=/usr > --datadir=/var/lib/mysql --user=mysql --pid-file=/var/run/mysqld/ user : mysql which takes 150 mb RAM and then /usr/sbin/named -u named -t /var/named/chroot user : Named 50 mb RAM taken by this process how can i solve this overusage of RAM and reduce it . I have access to root and SSH

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  • Offline web font optimization tool

    - by avok00
    I have a few web fonts on my web site that I want to reduce in size. I tried http://www.fontsquirrel.com/fontface/generator with very good results, but I need an offline professional tool to rely on. Can somebody recommend such a tool? I am not a specialist font creator, so I need something like a wizard that can guide me through font optimization. Any suggestion is much appretiated! EDIT: To make myself more clear, I need a font subsetting tool

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  • Can the users can apply Windows update without local administrator rights?

    - by AAA-Super
    My users are running on windows XP 32bit. normally WSUS automatically download and notify them to select which update want to install in the past they were in local administrator rights,now I reduce them to user rights so now they can't see the yellow notification said updated are available. Is there a way to give users permission to see the yellow notification and they can select updates by hand without local admin rights or power users? Any advice would be appreciated Thanks

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  • Diagnostic high load sys cpu - low io

    - by incous
    A Linux server running Ubuntu 12.04 LTS with LAMP has a strange behaviour since last week: - cpu %sys higher than before, nearly equal %usr (before that, %sys just little compare with %usr) - IO reduce by half or 1/3 compare with the week before I try to diagnostic the process/cpu by some command (top/vmstat/mpstat/sar), and see that maybe it's a bit high on interrupt timer/resched. I don't know what that means, now open to any suggestion.

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  • Database Snapshots of Mirrored databases affect performance of Principal database?

    - by yrushka
    I have 2 servers set in Mirroring High-safety. One is Principal and another in Mirror. Currently I have 2 snapshots of a Production database (100 GB size) created on Principal server (for no_lock purpose of massive select processes) and 2 snapshots on the mirror server for the same database for reporting purposes. I know snapshots reduce performance of source databases but I am not sure if snapshots from mirror server have any impact on principal server's performance. thanks,

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  • Do I still need to send the "Expires" header, or can I assume that web caches understand "Cache-Cont

    - by chris_l
    I want to reduce the overhead caused by HTTP headers to a minimum, so I'd like to avoid the "Expires" header, and use "Cache-Control" only - or maybe the other way around (I'm planning to send very short HTTP responses to browsers, so the answer to this question doesn't fully apply here: My headers account for a significant percentage). AFAIK, the "Cache-Control" header was standardized in HTTP 1.1, but are there still web caches/proxies, that don't understand it? Note: This is a sub-question to my stackoverflow (bounty) question

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  • How do I change colors on-the-fly in mintty?

    - by Thomas L Holaday
    How do I change the colors in a Cygwin mintty session which is already open? Is it possible? Use case: Under environment-imposed time constraints, multiple terminal windows have been opened without forethought. In order to reduce the risk of typing the commands for system A into the terminal for system B, it would be nice if they were different colors. Is there some escape sequence or whatnot that can change the color scheme for a running session?

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  • Is there a way to download all google webfonts in web font formats

    - by wayne
    They simple just have ttf in the repository and i am looking for a less painful way then just do change the browser referrer and download them one by one. As far as i understand it the conversation, as described in the google wiki takes effort and steps to reduce filesize ... so i just can't batch convert them. I simple want the exact files that google serves browsers for localhost (without internet) use. woff, sot, svg ...

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  • Firewall - Preventing Content Theft & Rogue Crawlers

    - by drodecker
    Our websites are being crawled by content thieves on a regular basis. We obviously want to let through the nice bots and legitimate user activity, but block questionable activity. We have tried IP blocking at our firewall, but this becomes to manage the block lists. Also, we have used IIS-handlers, however that complicates our web applications. Is anyone familiar with network appliances, firewalls or application services (say for IIS) that can reduce or eliminate the content scrapers?

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  • 500 MB Avi video from CD lagging/glitching when reproduced

    - by Caki Esther
    I created an extra cd with Nero Burning that contains both audio tracks (I can hear them correctly) and a .avi presentation (pretty big one, 540 MB on a 700 MB cd). The audio is fine but the problem is that when the video is played from the cd (with whatever media player: Windows Media Player, VLC, etc..) it lags/glitches/stutters. I'd like the video to be smooth, how should I burn the video to reduce this effect? I mean: what kind of compression/format and why?

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  • domino script to do housekeeping of email

    - by PA
    I need to provide my users with an action to clean their mailboxes. Specifically they want to be able to reduce the size of the email without compromising their contents. I have come out with some three actions to do: (1) remove pictures, (2) remove signatures and (3) remove chained emails. In addition to the already existent actions to remove the attachments. Do you know where can I find such script or tool?

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  • Beginner server local installation

    - by joanjgm
    Here's the thing I own a small business and currently my emails are being managed by some regular hosting using cpanel and that I bought a small server and installed windows server and exchange Can you tell what I did wrong here Installed and configured my current existing domain Configured all email address Installed noip in case my public address change In the cpanel of the domain I've added an MX record to the noip domain of the server with priority 0 so now emails are being received by my own server Now whenever I send an email to anyone gmail hotmail etc I get a response that cannot be delivered since may be junk This didn't happen when I sent emails from the hosting What's missing what did I do wrong heres the code mx.google.com rejected your message to the following e-mail addresses: Joan J. Guerra Makaren ([email protected]) mx.google.com gave this error: [186.88.202.13 12] Our system has detected that this message is likely unsolicited mail. To reduce the amount of spam sent to Gmail, this message has been blocked. Please visit http://support.google.com/mail/bin/answer.py?hl=en&answer=188131 for more information. cn9si815432vcb.71 - gsmtp Your message wasn't delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept e-mail from certain senders, or another restriction may be preventing delivery. Diagnostic information for administrators: Generating server: SERVERMEGA.megaconstrucciones.com.ve [email protected] mx.google.com #550-5.7.1 [186.88.202.13 12] Our system has detected that this message is 550-5.7.1 likely unsolicited mail. To reduce the amount of spam sent to Gmail, 550-5.7.1 this message has been blocked. Please visit 550-5.7.1 http://support.google.com/mail/bin/answer.py?hl=en&answer=188131 for 550 5.7.1 more information. cn9si815432vcb.71 - gsmtp ## Original message headers: Received: from SERVERMEGA.megaconstrucciones.com.ve ([fe80::9096:e9c2:405b:6112]) by SERVERMEGA.megaconstrucciones.com.ve ([fe80::9096:e9c2:405b:6112%10]) with mapi; Thu, 29 May 2014 11:32:19 -0430 From: prueba <[email protected]> To: "Joan J. Guerra Makaren" <[email protected]> Subject: Probando correos Thread-Topic: Probando correos Thread-Index: Ac97V1eW4OBFmoqJTRGoD7IPTC2azg== Date: Thu, 29 May 2014 16:04:35 +0000 Message-ID: <[email protected]> Accept-Language: en-US, es-VE Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: Content-Type: multipart/alternative; boundary="_000_000f42494487966276f7b241megaconstruccionescomve_" MIME-Version: 1.0

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  • About memory cache of Linux

    - by cheneydeng
    I'm running a python script to do some statistics and the actually memory which used is low,about 10%.And no other process cost more memory.However,when i use free -m and it shows that almost 95% memory has been used.The point is that my script should do a lot of read from files,so i wonder if there's any mechanism of Linux memory cache that caused the problem?echo 1 >> /proc/sys/vm/drop_caches works,but it seems manually.How can i reduce the memory cost and doesn't make a bad effect on reading files?

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  • Ubuntu is not detecting my LCD properly , how do I fix the problem ?

    - by Nishant
    I want to reduce the brightness of my monitor as per my wish . But ubuntu System-Prefernce-Monitor doesn't have options and I think that coz it uses generic drivers . How do I fix this problem ? Model is Acer One Zg5 , Ubuntu 10.10 OS . Do I load the LCD driver ? I think it has a intel based inbuilt GFX card . /proc/acpi/video/OVGA/LCD$ cat * device_id: 0x0400 type: UNKNOWN known by bios: no state: 0x1d query: 0x00

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  • dual boot with windows and linux

    - by nuttynibbles
    hi, i have windows xp installed. Recently i installed suse linux and afterwhich suse linux is the main OS to be booted up. However suse rovide options to boot windows 1 (window xp) during boot up. If i uninstall suse linux (i've tried), windows won't be able to be booted up as the grub master boot will be corrupted. my question is: is there a software tool which can be booted on cd to modify the master boot record so as to reduce much effort??

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  • dual boot with windows and linux

    - by nuttynibbles
    hi, i have windows xp installed. Recently i installed suse linux and afterwhich suse linux is the main OS to be booted up. However suse rovide options to boot windows 1 (window xp) during boot up. If i uninstall suse linux (i've tried), windows won't be able to be booted up as the grub master boot will be corrupted. my question is: is there a software tool which can be booted on cd to modify the master boot record so as to reduce much effort??

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  • IIS6 - Classic ASP - "out of memory"/"out of string space"

    - by glaucon
    We have a classic ASP application that's under significantly more load than usual. We are from time to time been getting "out of memory" and "out of string space" in the httperr. We do not usually see these errors. For the moment we cannot change the application. Is there anything we can do to the IIS config which will help to reduce or stop these errors occurring ? The application pool is set to default values currently.

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  • Do’s and Don’ts Building SharePoint Applications

    - by Bil Simser
    SharePoint is a great platform for building quick LOB applications. Simple things from employee time trackers to server and software inventory to full blown Help Desks can be crafted up using SharePoint from just customizing Lists. No programming necessary. However there are a few tricks I’ve painfully learned over the years that you can use for your own solutions. DO What’s In A Name? When you create a new list, column, or view you’ll commonly name it something like “Expense Reports”. However this has the ugly effect of creating a url to the list as “Expense%20Reports”. Or worse, an internal field name of “Expense_x0x0020_Reports” which is not only cryptic but hard to remember when you’re trying to find the column by internal name. While “Expense Reports 2011” is user friendly, “ExpenseReports2011” is not (unless you’re a programmer). So that’s not the solution. Well, not entirely. Instead when you create your column or list or view use the scrunched up name (I can’t think of the technical term for it right now) of “ExpenseReports2011”, “WomenAtTheOfficeThatAreMen” or “KoalaMeatIsGoodWhenBroiled”. After you’ve created it, go back and change the name to the more friendly “Silly Expense Reports That Nobody Reads”. The original internal name will be the url and code friendly one without spaces while the one used on data entry forms and view headers will be the human version. Smart Columns When building a view include columns that make sense. By default when you add a column the “Add to default view” is checked. Resist the urge to be lazy and leave it checked. Uncheck that puppy and decide consciously what columns should be included in the view. Pick columns that make sense to what the user is trying to do. This means you have to talk to the user. Yes, I know. That can be trying at times and even painful. Go ahead, talk to them. You might learn something. Find out what’s important to them and why. If they’re doing something repetitively as part of their job, try to make their life easier by including what’s most important to them. Do they really need to see the Created *and* Modified date of a document or do they just need the title and author? You’ll only find out after talking to them (or getting them drunk in a bar and leaving them in the back alley handcuffed to a garbage bin, don’t ask). Gotta Keep it Separated Hey, views are there for a reason. Use them. While “All Items” is a fine way to present a list of well, all items, it’s hardly sufficient to present a list of servers built before the Y2K bug hit. You’ll be scrolling the list for hours finally arriving at Page 387 of 12,591 and cursing that SharePoint guy for convincing you that putting your hardware into a list would be of any use to anyone. Next to collecting the data, presenting it is just as important. Views are often overlooked and many times ignored or misused. They’re the way you can slice and dice the data up so that you’re not trying to consume 3,000 years of human evolution on a single web page. Remember views can be filtered so feel free to create a view for each status or one for each operating system or one for each species of Information Worker you might be putting in that list or document library. Not only will it reduce the number of items someone sees at one time, it’ll also make the information that much more relevant. Also remember that each view is a separate page. Use it in navigation by creating a menu on the Quick Launch to each view. The discoverability of the Views menu isn’t overly obvious and if you violate the rule of columns (see Horizontally Scrolling below) the view menu doesn’t even show up until you shuffle the scroll bar to the left. Navigation links, big giant buttons, a screaming flashing “CLICK ME NOW” will help your users find their way. Sort It! Views are great so we’re building nice, rich views for the user. Awesomesauce. However sort is not very discoverable by the user. For example when you’re looking at a view how do you know if it’s ascending or descending and what is it sorted on. Maybe it’s sorted using two fields so what’s that all about? Help your users by letting them know the information they’re looking at is sorted. Maybe you name the view something appropriate like “Bogus Expense Claims Sorted By Deadbeats”. If you use the naming strategy just make sure you keep the name consistent with the description. In the previous example their better be a Deadbeat column so I can see the sort in action. Having a “Loser” column, while equally correct, is a little obtuse to the average Information Worker. Remember, they usually don’t use acronyms and even if they knew how to, it’s not immediately obvious to them that’s what you’re trying to convey. Another option is to simply drop a Content Editor Web Part above the list and explain exactly the view they’re looking at. Each view is it’s own page so one CEWP won’t be used across the board. Be descriptive in what the user is seeing but try to keep it brief. Dumping the first chapter of I, Claudius might be informative to the data but can gobble up screen real estate and miss the point of having the list. DO NOT Useless Attachments The attachments column is, in a word, useless. For the most part. Sure it indicates there’s an attachment on the list item but in the grand scheme of things that’s not overly informative. Maybe it is and by all means, if it makes sense to you include it. Colour it. Make it shine and stand like the Return of Clippy on every SharePoint list. Without it being functional it can be boring. EndUserSharePoint.com has an article to make the son of Clippy that much more useful so feel free to head over and check out this blog post by Paul Grenier on the task (Warning code ahead! Danger Will Robinson!) In any case, I would suggest you remove it from your views. Again if it’s important then include it but consider the jQuery solution above to make it functional. It’s added by default to views and one of things that people forget to clean up. Horizontal Scrolling Screen real estate is premium so building a list that contains 8,000 columns and stretches horizontally across 15 screens probably isn’t the most user friendly experience. Most users can’t figure out how to scroll vertically let alone horizontally so don’t make it even that more confusing for them. Take the Steve Krug approach in your view designs and try not to make the user think. Again views are your friend. Consider splitting up the data into views where one view contains 10 columns and other view contains the other 10. Okay, maybe your information doesn’t work that way but humans can only process 7 pieces of data at a time, 10 at most (then their heads explode and you don’t want to clean that mess up, especially on a Friday night before the big dance). It drives me batshit crazy when I see a view with 80 columns of data. I often ask the user “So what do you do with all this information”. The response is usually “With this data [the first 10 columns] I decide if I’m going to fire everyone, and with this data [the next 10 columns] I decide if I’m going to set the building on fire and collect the insurance”. It’s at that point I show them how to create two new views “People Who Are About To Get The Axe” and “Beach Time For The Executives”. Again, talk to your users and try to reason with them on cutting down the number of columns they see at once. Vertical Scrolling Another big faux pas I find is the use of multi-line comment fields in views. It’s not so bad when you have a statement like this in your view: “I really like, oh my god, thought I was going to scream when I saw this turtle then I decided what I was going to have for dinner and frankly I hate having to work late so when I was talking to the customer I thought, oh my god, what if the customer has turtles and then it appeared to me that I really was hungry so I'm going to have lunch now.” It’s fine if that’s the only column along with two or three others, but once you slap those 20 columns of data into the list, the comment field wraps and forms a new multi-page novel that takes up your entire screen. Do everyone a favour and just avoid adding the column to views. Train the user to just click through to the item if they need to see the contents. Duplicate Information Duplication is never good. Views and great as you can group data together. For example create a view of project status reports grouped by author. Then you can see what project manager is being a dip and not submitting their report. However if you group by author do you really need the Created By field as well in the view? Or if the view is grouped by Project then Author do you need both. Horizontal real estate is always at a premium so try not to clutter up the view with duplicate data like this. Oh  yeah, if you’re scratching your head saying “But Bil, if I don’t include the Project name in the view and I have a lot of items then how do I know which one I’m looking at”. That’s a hint that your grouping is too vague or you have too much data in the view based on that criteria. Filter it down a notch, create some views, and try to keep the group down to a single screen where you can see the group header at the top of the page. Again it’s just managing the information you have. Redundant, See Redundant This partially relates to duplicate information and smart columns but basically remember to not include the obvious in a view. Remember, don’t make me think. If you’ve gone to the trouble (and it was a lot of trouble wasn’t it?) to create separate views of your data by creating a “September Zombie Brain Sales”, “October Zombie Brain Sales”, etc. then please for the love of all that is holy do not include the Month and Product columns in your view. Similarly if you create a “My” view of anything (“My Favourite Brands of Spandex”, “My Co-Workers I Find The Urge To Disinfect”) then again, do not include the owner or author field (or whatever field you use to identify “My”). That’s just silly. Hope that helps! Happy customizing!

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