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performance drop moving from 3.0 to 3.1?

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I'm using squid in a pure access control mode (all caching disabled) and am looking to move from 3.0 to 3.1, but when I'm doing lab tests with it I am seeing a significant performance drop.

when doing a simple small request test (using ab to hammer the proxy retrieving 40 byte pages) 3.0 is reaching 4200 request/sec while under the exact same conditions 3.1.11 is barely topping 1400 requests/sec.

if I request larger pages (100K), 3.0 does ~650 requests/sec while 3.1 only manages ~480 requests/sec. going up to 1M pagess, 3.0 does 90 requests/sec while 3.1 does 60

this is with identical configuration except that 3.0 has the null disk cache driver configured while 3.1 has that line commented out.

In all of these cases, squid is maxing out at 100% of the single core it has available to it.

David Lang


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