Varnish Performance Issue
phk at phk.freebsd.dk
Wed Dec 3 11:13:07 CET 2008
In message <75cf5800812022248n6704cef5k44ea4ba44876a31c at mail.gmail.com>, "Paras
>I am faced with following performace issue with respect to Varnish.
>Load on Varnish increases suddenly at times. When this happens ,
>"varnishhist" shows a high number of misses and the cache hit ratio
>decreases and the response time increases.
I think this sounds pretty normal, try examining the traffic pattern
and see if coincides with the arrival of robots/spiders at your
If you want to, you can return a temporary error in vcl_miss if the
user-agent indicates a robot or spider, that way they don't pull
your entire site content into 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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