Hi.
Ivan Voras wrote:
CPU states: 5.9% user, 0.0% nice, 81.3% system, 0.0% interrupt, 12.8% idle
CPU states: 82.2% user, 0.0% nice, 13.8% system, 0.0% interrupt, 4.0% idle
Interesting coincidence: 1 CPU generates almost 8x less "sys time" then 8 CPUs.
But it seems that you have found something real. Inspired by your
problem I've done a simple measurement ("ab") on a 4-CPU (2x2 core
Opterons 2216 HE, PAE) machine I maintain, under these circumstances:
- a "heavy" PHP application
- FastCGI
- in this case, load of 4 clients
- on 6-STABLE
and I'm reporting similar findings:
CPU states: 38.8% user, 0.0% nice, 48.4% system, 3.2% interrupt, 9.6% idle
We are not so performance bound as you so I didn't do measurements
earlier. I cannot "play" with settings on this machine as it is in
production, but ~~50% sys time (the measurement changes around 45% +/-
10%) seems too much.
Thank you for your research. I think you can get more %sys with 4-core
processors. For me 2xquad-core systems are now completely unusable as
PHP backends.
Anyway I'm happy that I'm not alone with this problem. But what can we
do about it?
With best regards,
Alexey Popov
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