Varnish Performance Issue

Paras Fadte plfgoa at
Wed Dec 3 11:47:54 CET 2008

Hi Poul,

What I wanted to know was whether the sudden spikes would be  caused
due to cache management by varnish which it could be doing

Thank you.


On Wed, Dec 3, 2008 at 4:07 PM, Poul-Henning Kamp <phk at> wrote:
> In message <75cf5800812030230v62dccd54m6e1538ad28795916 at>, "Paras
>  Fadte" writes:
>>The traffic is steady and the server is not directly externally
>>available , It acts as a caching server behind a load balancer for the
>>origin servers. I have attached bandwidth graph for our perusal. What
>>confuses is the sudden Spike in CPU usage .
> As I said, I don't see anything abnormal, you said yourself that
> the spikes match times with lower hit rates.  Picking up things
> from the backend takes significantly more effort than just
> serving them out of the cache.
> --
> 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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