Date: Mon, 14 Nov 2011 12:51:35 -0800 From: Doug Barton <dougb@FreeBSD.org> To: freebsd-stable@FreeBSD.org Cc: Daniil Cherednik <dcherednik@masterhost.ru> Subject: Re: 8.2 + apache == a LOT of sigprocmask Message-ID: <4EC17F57.5030008@FreeBSD.org> In-Reply-To: <4EC17AAF.9050807@FreeBSD.org> References: <4EC17AAF.9050807@FreeBSD.org>
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On 11/14/2011 12:31, Doug Barton wrote: > Trying to track down a load problem we're seeing on 8.2-RELEASE-p4 i386 > in a busy web hosting environment I came across the following post: > > http://lists.freebsd.org/pipermail/freebsd-questions/2011-October/234520.html > > That basically describes what we're seeing as well, including the > "doesn't happen on Linux" part. > > Does anyone have any ideas about this? > > With incredibly similar stuff running on 7.x we didn't see this problem, > so it seems to be something new in 8. Just took a closer look at our ktrace, and actually our pattern is slightly different than the one in that post. In ours the second option is null, but the third is set: 74195 httpd 0.000017 RET sigprocmask 0 74195 httpd 0.000013 CALL sigprocmask(SIG_BLOCK,0,0xbfbf89d4) 74195 httpd 0.000009 RET sigprocmask 0 74195 httpd 0.000013 CALL sigprocmask(SIG_BLOCK,0,0xbfbf89d4) 74195 httpd 0.000009 RET sigprocmask 0 74195 httpd 0.000012 CALL sigprocmask(SIG_BLOCK,0,0xbfbf89d4) But repeated hundreds of times in a row. -- "We could put the whole Internet into a book." "Too practical." Breadth of IT experience, and depth of knowledge in the DNS. Yours for the right price. :) http://SupersetSolutions.com/
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