Varnish Performance Issue

Poul-Henning Kamp phk at
Wed Dec 3 11:37:54 CET 2008

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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