Hi, 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) RAM:20GB CPU: Intel(R) Xeon(R) CPU E5430 @ 2.66GHz Thanks in Advance. -Paras
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