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From: John Baldwin <jhb@freebsd.org>
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	(bigwig.baldwin.cx); Mon, 14 Nov 2011 15:56:13 -0500 (EST)
Cc: Daniil Cherednik <dcherednik@masterhost.ru>,
	Doug Barton <dougb@freebsd.org>, Konstantin Belousov <kib@freebsd.org>
Subject: Re: 8.2 + apache == a LOT of sigprocmask
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On Monday, November 14, 2011 3:31:43 pm 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.

I suspect it has to do with some of the changes to rtld such that it now
always blocks signals while resolving symbols (or something along those
lines IIRC).  It makes throwing exceptions slow as well.

-- 
John Baldwin