Date: Fri, 12 May 2006 18:14:14 -0400 From: Chuck Swiger <cswiger@mac.com> To: Ivan Voras <ivoras@fer.hr> Cc: stable@freebsd.org Subject: Re: pagezero again Message-ID: <446508B6.4000305@mac.com> In-Reply-To: <4464FA8D.5060309@fer.hr> References: <4464FA8D.5060309@fer.hr>
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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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