sendfile() and Varnish2.0.2

Paras Fadte plfgoa at
Wed Dec 3 11:10:07 CET 2008

Hi Poul,

Can you please shed some light on the mail that I had sent regarding
varnish performance  ? In the same mail I have attached a mrtg graph
of CPU utilisation which is very spiky.

Thank you.


On Wed, Dec 3, 2008 at 3:28 PM, Poul-Henning Kamp <phk at> wrote:
> In message <75cf5800812030153h762711f3q1ff2b31819970d70 at>, "Paras
>  Fadte" writes:
>>Hi Poul,
>>Thanks for the response. So  "thread_pools" parameter should be
>>increased or the "thread_pool_max" or both should be increased ?
>>Currently I have "thread_pools" as 4 and "thread_pool_max" as 750
> You should only increase thread_pools if you have performance
> problems due to lock-contention.
> You should only increas thread_pool_max if you regularly have
> bursts of dropped sessions.
> --
> 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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