How to tune Windows 2008r2 and IIS to maximize single file download speeds?

Posted by uSlackr on Server Fault See other posts from Server Fault or by uSlackr
Published on 2013-06-28T13:05:25Z Indexed on 2013/07/02 23:08 UTC
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windows-server-2008-r2

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iis

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tcp

We recently put up an IIS site (on WinSvr 2008r2) that is used almost exclusively for downloading files over the internet. The data exists as a large collection of .zip files ranging from 1MB - 35GB in size. We want to allow a lot of downloads during a day (more than 500GB) but have implemented an outbound ASA throttle at 60mbps in order to preserve bandwidth for other uses. The total link speed is 100mbps.

Here's the interesting part: While we can serve up multiple downloads to hit the 60mbps cap, we cannot get any single download to exceed 2.5M bytes/sec (20 Mbits/s). Is there any TCP or IIS tuning we can do to push up individual download speeds? Or something else to look at?

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