From owner-freebsd-stable@FreeBSD.ORG Mon Nov 14 20:51:36 2011 Return-Path: Delivered-To: freebsd-stable@FreeBSD.org Received: from mx2.freebsd.org (mx2.freebsd.org [IPv6:2001:4f8:fff6::35]) by hub.freebsd.org (Postfix) with ESMTP id 226C31065675 for ; Mon, 14 Nov 2011 20:51:36 +0000 (UTC) (envelope-from dougb@FreeBSD.org) Received: from 172-17-198-245.globalsuite.net (hub.freebsd.org [IPv6:2001:4f8:fff6::36]) by mx2.freebsd.org (Postfix) with ESMTP id E6045155652; Mon, 14 Nov 2011 20:51:35 +0000 (UTC) Message-ID: <4EC17F57.5030008@FreeBSD.org> Date: Mon, 14 Nov 2011 12:51:35 -0800 From: Doug Barton Organization: http://SupersetSolutions.com/ User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:8.0) Gecko/20111110 Thunderbird/8.0 MIME-Version: 1.0 To: freebsd-stable@FreeBSD.org References: <4EC17AAF.9050807@FreeBSD.org> In-Reply-To: <4EC17AAF.9050807@FreeBSD.org> X-Enigmail-Version: undefined OpenPGP: id=1A1ABC84 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: Daniil Cherednik Subject: Re: 8.2 + apache == a LOT of sigprocmask X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 14 Nov 2011 20:51:36 -0000 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/