Ivan Voras wrote:
Some time ago I reported that pagezero kernel thread sometime takes (what seems to me) a too large chunk of available CPU (30%) on a very busy web server. There were no replies :( Since then, I've reconfigured apache to use PHP as a fastcgi module and the problem seems to have gotten worse - now it *always* takes ~25-30% CPU, and my "System" time stat shows it (its almost always ~30%).

From what I can understand, pagezero thread fills kernel's pool of zeroed pages. This looks non-threteaning, but what would cause such high demand of zeroed pages on my system?

Generally, a whole bunch of processes that are demanding a lot or memory and/or swapping would do it.
What does "vmstat 1" look like...?

--
-Chuck

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