client keepalive on high trafic site

Poul-Henning Kamp phk at
Tue Sep 8 12:41:56 CEST 2009

In message <4AA633E3.6030508 at>, =?UTF-8?B?VsOhY2xhdiBCw61sZWs=?= writes:

>I think that is not the problem... when I disable keepalive by seting
>"connection: close" header then i get 4x higher throughput ( but works
>bad in IE6)
>... till the 8K established connection everithing works fine (low
>latency responses, only 10%cpu usage on server, load around 1-2)

Why don't you restrict "connection: close" to non-IE6 then ?

You can test the User-Agent header in your VCL code

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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