How to troubleshoot latency between 2 linux hosts

Posted by Jimm on Server Fault See other posts from Server Fault or by Jimm
Published on 2012-11-03T15:01:13Z Indexed on 2012/11/03 17:05 UTC
Read the original article Hit count: 251

Filed under:

networking

|

linux-networking

|

latency

The latency between 2 linux hosts is about .23ms. They are connected by one switch. Ping & Wireshark confirm the latency number. But, i dont have any visibility into what is causing this latency. How can i know if the latency is due to NIC on host A or B or the switch or the cables?

UPDATE: The .23 ms latency is bad for my existing application, which sends messages at very high frequency and i am trying to see if it can be brought down to .1ms

© Server Fault or respective owner

Related posts about networking

Networking stopped working on Ubuntu

as seen on Super User - Search for 'Super User'
I installed Ubuntu 10.04 through the Wubi installer (Funny, I installed it today and thought I would have gotten 10.10). I had a network connection and everything was working fine. I rebooted my coumputer a couple of times and then suddenly, I could not connect to the network and when I click the… >>> More
Troubles with start up defenition of networking service in Ubuntu

as seen on Super User - Search for 'Super User'
I use Ubuntu 12.04.1. I put attention that networking script starting in runlevel 0: user@comp:/etc/rc0.d$ chkconfig -l networking networking 0:on 1:off 2:off 3:off 4:off 5:off 6:off When I try to move it working to appropriate run levels I get error: user@comp:/etc/rc0… >>> More
Installing the Elgg Social Networking CMS

as seen on Internet.com - Search for 'Internet.com'
One Open Source CMS that stands out above the rest for small businesses and personal networks is the Elgg open source "social engine," which can be used to create social applications. Scott Clark shows you how to install and get started with this social networking CMS. >>> More
OAuth: Token-Based Authorization for the Social Networking Age

as seen on Internet.com - Search for 'Internet.com'
The OAuth token-based authorization system allows users to grant third-party access to their resources without sharing their usernames and passwords. It's perfect for the age of data scattered across many social networking sites. >>> More
OAuth: Token-Based Authorization for the Social Networking Age

as seen on Internet.com - Search for 'Internet.com'
The OAuth token-based authorization system allows users to grant third-party access to their resources without sharing their usernames and passwords. It's perfect for the age of data scattered across many social networking sites. >>> More

Related posts about linux-networking

Tutorial: 7 Useful Linux Networking Commands

as seen on Internet.com - Search for 'Internet.com'
Eric Geier introduces us to to seven powerful commands for troubleshooting and configuring Linux networking, both wired and wireless. >>> More
Linux networking "jail" for a single process

as seen on Server Fault - Search for 'Server Fault'
I need to tune up a networking app for network specific things like: make it use a DNS server different than the default one from /etc/resolv.conf make sure it does not try to connect to certain hosts/ports using tcp/udp connections I know I can get away with just modifying /etc/resolv.conf and… >>> More
What do "Unknown SSAP" and "Unknown DSAP" mean in tcpdump?

as seen on Server Fault - Search for 'Server Fault'
While trying to fix a problem with intermittently losing internet connection on a machine with a wireless connection to a router, I ran tcpdump and noticed packets with "Unknown SSAP" and "Unknown DSAP" errors coming at a rate of a few per second. 20:27:21.703178 00:24:a5:af:24:f6 (oui Unknown) Unknown… >>> More
Dual NIC Networking CentOS 5.3 (losing connection)

as seen on Server Fault - Search for 'Server Fault'
I have a CentOS System with two NICs on it. One is Ethernet the other is Wireless. The Ethernet has an address of 192.168.1.110 and is tied to a LAN. (The LAN provides DHCP and DNS for its domain of 192.168.1.*) The Wireless card should have an address of 131.238.. and is tied to the WAN. For… >>> More
Linux e1000e (Intel networking driver) problems galore, where do I start?

as seen on Server Fault - Search for 'Server Fault'
I'm currently having a major problem with e1000e (not working at all) in Ubuntu Maverick (1.0.2-k4), after resume I'm getting a lot of stuff in dmesg: [ 9085.820197] e1000e 0000:02:00.0: PCI INT A disabled [ 9089.907756] e1000e: Intel(R) PRO/1000 Network Driver - 1.0.2-k4 [ 9089.907762] e1000e: Copyright… >>> More