2 x quad-core system is slower that 2 x dual core on FreeBSD
lol at chistydom.ru
Tue Nov 20 03:27:20 PST 2007
Kris Kennaway wrote:
>>>>>> CPU states: 9.5% user, 0.0% nice, 82.0% system, 0.5%
>>>>>> interrupt, 8.0% idle
>>>>> A wild idea that might not help: try reducing kern.hz in
>>>>> loader.conf to
>>>>> something like 100 and see if something significant changes.
>> Usually on PHP backends slow PHP code eats most of the CPU time. I
>> have %user much bigger than %system in CPU states.
>> But now %system is much bigger than %user and I can conclude that on
>> 8-core server FreeBSD consumes more CPU time than PHP.
> That is one possibility, but you still need to look at the actual
> throughput on these machines before making conclusions about which is
> performing better. Can you please provide those numbers for 6.x, 7.x
> with ULE and 4BSD on the 4-core and 8-core systems?
Ok, here's results of practical research. The following is approximate
maximum qps that backends can survive with my workload:
7-STABLE quad ULE 20
7-STABLE quad 4BSD 17
6-STABLE quad 14
6-STABLE dual 21
Linux CentOS 5 quad >50
With best regards,
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