From owner-freebsd-stable@FreeBSD.ORG Tue Dec 13 21:52:35 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 2675C1065670 for ; Tue, 13 Dec 2011 21:52:35 +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 207FA14D93A; Tue, 13 Dec 2011 21:52:33 +0000 (UTC) Message-ID: <4EE7C920.3010109@FreeBSD.org> Date: Tue, 13 Dec 2011 13:52:32 -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: <4EE29D3F.2030009@gridfury.com> In-Reply-To: <4EE29D3F.2030009@gridfury.com> X-Enigmail-Version: undefined OpenPGP: id=1A1ABC84 X-Forwarded-Message-Id: <4EE29D3F.2030009@gridfury.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: Subject: kernel: negative sbsize for uid = 0 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: Tue, 13 Dec 2011 21:52:35 -0000 I'm running 8.2-RELEASE-p4 i386 on some web servers that are generally lightly-moderately loaded, but occasionally see some heavy spikes where load average goes way up. When that is happening, but sometimes even when it's not, I get hundreds of this message spewing into the logs: kernel: negative sbsize for uid = 0 I haven't found anything particularly useful by searching for that message, the one reference was to mbufs, but that seems not to be the problem. Here is the output of 'netstat -m' during one of the load spikes: 598/1712/2310 mbufs in use (current/cache/total) 559/1533/2092/32768 mbuf clusters in use (current/cache/total/max) 559/1105 mbuf+clusters out of packet secondary zone in use (current/cache) 0/528/528/16384 4k (page size) jumbo clusters in use (current/cache/total/max) 0/0/0/8192 9k jumbo clusters in use (current/cache/total/max) 0/0/0/4096 16k jumbo clusters in use (current/cache/total/max) 1267K/5606K/6873K bytes allocated to network (current/cache/total) 0/0/0 requests for mbufs denied (mbufs/clusters/mbuf+clusters) 0/0/0 requests for jumbo clusters denied (4k/9k/16k) 0/2239/6656 sfbufs in use (current/peak/max) 0 requests for sfbufs denied 0 requests for sfbufs delayed 809790 requests for I/O initiated by sendfile 0 calls to protocol drain routines So is this message something to worry about? If so, how can I diagnose what's happening, and how do I fix it? Doug