Varnish Performance Issue
plfgoa at gmail.com
Wed Dec 3 07:48:41 CET 2008
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. Also there is a gradual
increase in the number of "overflowed work requests" over a period of
time. I have attached mrtg of CPU utilisation for perusal. It shows a
very spiky graph.
What could be the issue ? What parameters do I need to adjust to
overcome this load issue ?
The settings used are :
lru_interval = 30
thread_pool_max = 750 (initially I had set this to 300 but the load
issue was the same)
overflow_max = 100000
sess_timeout = 2
listen_depth = 4096
Cache size is 3GB ( ramdisk)
Varnish Version:2.0.2 (built from source)
OS:SUSE LINUX 10.1 (X86-64)
CPU: Intel(R) Xeon(R) CPU E5430 @ 2.66GHz
Thanks in Advance.
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