From owner-freebsd-stable@freebsd.org Thu Oct 29 10:00:39 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 AFC50A1EFB3 for ; Thu, 29 Oct 2015 10:00:39 +0000 (UTC) (envelope-from 000.fbsd@quip.cz) Received: from elsa.codelab.cz (elsa.codelab.cz [94.124.105.4]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 7054215CC for ; Thu, 29 Oct 2015 10:00:38 +0000 (UTC) (envelope-from 000.fbsd@quip.cz) Received: from elsa.codelab.cz (localhost [127.0.0.1]) by elsa.codelab.cz (Postfix) with ESMTP id D3C0328436; Thu, 29 Oct 2015 11:00:34 +0100 (CET) Received: from illbsd.quip.test (ip-89-177-49-111.net.upcbroadband.cz [89.177.49.111]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by elsa.codelab.cz (Postfix) with ESMTPSA id D229428422; Thu, 29 Oct 2015 11:00:32 +0100 (CET) Message-ID: <5631EE40.3020404@quip.cz> Date: Thu, 29 Oct 2015 11:00:32 +0100 From: Miroslav Lachman <000.fbsd@quip.cz> User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:35.0) Gecko/20100101 Firefox/35.0 SeaMonkey/2.32 MIME-Version: 1.0 To: Jeremy Chadwick , freebsd-stable@freebsd.org Subject: Re: stable/10: high load average when box is idle References: <20151027050508.GA7612@icarus.home.lan> In-Reply-To: <20151027050508.GA7612@icarus.home.lan> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit 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 10:00:39 -0000 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. Miroslav Lachman