From owner-freebsd-stable@freebsd.org Thu Oct 29 10:09:13 2015 Return-Path: Delivered-To: freebsd-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id D4B6EA1F33E for ; Thu, 29 Oct 2015 10:09:13 +0000 (UTC) (envelope-from jdc@koitsu.org) Received: from resqmta-po-12v.sys.comcast.net (resqmta-po-12v.sys.comcast.net [IPv6:2001:558:fe16:19:96:114:154:171]) (using TLSv1.2 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (Client CN "Bizanga Labs SMTP Client Certificate", Issuer "Bizanga Labs CA" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id A61B91BB6 for ; Thu, 29 Oct 2015 10:09:13 +0000 (UTC) (envelope-from jdc@koitsu.org) Received: from resomta-po-16v.sys.comcast.net ([96.114.154.240]) by resqmta-po-12v.sys.comcast.net with comcast id ay9B1r0035BUCh401y9Buq; Thu, 29 Oct 2015 10:09:11 +0000 Received: from jdc.koitsu.org ([69.181.142.213]) by resomta-po-16v.sys.comcast.net with comcast id ay9A1r0074cTVs501y9AEn; Thu, 29 Oct 2015 10:09:11 +0000 Received: by icarus.home.lan (Postfix, from userid 1000) id 5E7801AF13D; Thu, 29 Oct 2015 03:09:10 -0700 (PDT) Date: Thu, 29 Oct 2015 03:09:10 -0700 From: Jeremy Chadwick To: Miroslav Lachman <000.fbsd@quip.cz> Cc: freebsd-stable@freebsd.org Subject: Re: stable/10: high load average when box is idle Message-ID: <20151029100910.GA52255@icarus.home.lan> References: <20151027050508.GA7612@icarus.home.lan> <5631EE40.3020404@quip.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5631EE40.3020404@quip.cz> User-Agent: Mutt/1.5.24 (2015-08-30) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=comcast.net; s=q20140121; t=1446113351; bh=sYV+6ea9x8bsRKdti9b46z+27wP/SuA5NP8v93rYAiY=; h=Received:Received:Received:Date:From:To:Subject:Message-ID: MIME-Version:Content-Type; b=INjCnUn2RNwjIWa2uMQsGLolAgDzQ6gkAbA5Jdg7UjtHkiV5YQH5pOGMGE1ZvQtqV mNuq7KZivXL16obV56XZN8Sql2ZW1hncpVseVtz51QJfZPmaXShQkmd4ispc2k/Q6F 9pJ0ofoqZLkhSgp9iH/FhX0M2+8mnCVX/zHvUo13pmls8AAOOB/d9ABU80vEf+xN3n PIXuyi24/oQqUtrToNQG0jv0sjOa/SYEGboSPxIlxYdJX8W36cDXVnevWE7zCQVsh9 WCu2eQjs2EI2qTrG3gyl0mRP0YWF+qnju2eV9ugDZBpjX/oqgzxmoxIhOcUEr5kRGl qD2F3P405nJuQ== X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Oct 2015 10:09:14 -0000 On Thu, Oct 29, 2015 at 11:00:32AM +0100, Miroslav Lachman wrote: > Jeremy Chadwick wrote on 10/27/2015 06:05: > >(I am not subscribed to the mailing list, please keep me CC'd) > > > >Issue: a stable/10 system that has an abnormally high load average (e.g. > >0.15, but may be higher depending on other variables which I can't > >account for) when the machine is definitely idle (i.e. cannot be traced > >to high interrupt usage per vmstat -i, cannot be traced to a userland > >process or kernel thread, etc.). > > > >This problem has been discussed many times on the FreeBSD mailing lists > >and the FreeBSD forum (including some folks seeing it on 9.x, but my > >complaint here is focused on 10.x so please focus there). > > > >I'd politely like to request that anyone experiencing this, or who has > >experienced it (and if you know when it stopped or why, including what > >you may have done, include that), to chime in on this ticket from 2012 > >(made for 9.x but style of issue still applies; c#5 is quite valid): > > > >https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=173541 > > > >For those still experiencing it, I'd suggest reading c#8 and seeing if > >sysctl kern.eventtimer.periodic=1 relieves the problem for you. (At > >this time I would not suggest leaving that set indefinitely, as it does > >seem to increase the interrupt rate in cpuX:timer in vmstat -i. But for > >me kern.eventtimer.periodic=1 "fixes" the issue) > > Is it on real HW server or in some kind of virtualization? I am seeing load > 0.5 - 1.2 on three virtual machines in VMware. The machines are without any > traffic. Just fresh instalation of FreeBSD 10.1 and some services without > any public content. I've seen it on both bare-metal and VMs. Please see c#8 in the ticket; there's an itemised list of where I've seen it, but I'm sure it's not limited to just those. -- | Jeremy Chadwick jdc@koitsu.org | | UNIX Systems Administrator http://jdc.koitsu.org/ | | Making life hard for others since 1977. PGP 4BD6C0CB |