Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753403Ab0FZQrN (ORCPT ); Sat, 26 Jun 2010 12:47:13 -0400 Received: from mail-fx0-f46.google.com ([209.85.161.46]:42695 "EHLO mail-fx0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753081Ab0FZQrM (ORCPT ); Sat, 26 Jun 2010 12:47:12 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=S2NtLFg+baBRdlda989p+8AdA+jnAm4C3mXjnAfbPkmDoV+TVPZF/cE8w21nVfLxHO gszv/UEYd+bAIpR2wwU6HRPLHemBgSyI8QxBgxS68CRfitd7gXG4kDRhJe+ScKyU3Qq2 e8KvSB7Xl0L2HrzjTuK9ll8OYS87vw6t36WRY= MIME-Version: 1.0 In-Reply-To: <4C2620F4.7030900@colorfullife.com> References: <20100621200118.GA4021@nb-core2.darkstar.lan> <4C223657.3030507@colorfullife.com> <4C251AFF.70803@colorfullife.com> <4C2620F4.7030900@colorfullife.com> Date: Sat, 26 Jun 2010 18:47:09 +0200 Message-ID: Subject: Re: 2.6.35-rc3: System unresponsive under load From: Luca Tettamanti To: Manfred Spraul Cc: Christoph Lameter , linux-kernel@vger.kernel.org, Julia Lawall , Andrew Morton , maciej.rutecki@gmail.com Content-Type: multipart/mixed; boundary=001485f2c1807c19570489f1a338 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 21686 Lines: 315 --001485f2c1807c19570489f1a338 Content-Type: text/plain; charset=UTF-8 On Sat, Jun 26, 2010 at 5:47 PM, Manfred Spraul wrote: > Hi Luca, > > On 06/26/2010 02:52 PM, Luca Tettamanti wrote: >> >> They don't seem really hung as before, I see two different behaviours: >> * Near the end of the run ab is frozen for a few seconds, but in the >> end all requests are processed; however I see a few "length" errors, >> meaning that the received page does not match the expected content >> (I'm testing a static page): >> >> > > That's consistent with what I see: > If I run: > #./semtimedop 100 100& > #./semtimedop 100 100& > #./semtimedop 100 100& > #./semtimedop 100 100& > > (i.e.: 4 times the attached test app concurrently), then the system > sometimes locks up for 10..20 seconds: > The keyboard is unresponsive, not even the numlock key is processed (i.e.: > the LED does not change anymore). > After 10 or 20 seconds, the keyboard reacts again (both to and to > Num Lock) > The stock Fedora 13 kernel (2.6.33.5) does not exhibit this behavior > The load average is 300 or so, that's expected. Confirmed here: your test program freezes the system for a while under 2.6.35-rc3, while vanilla 2.6.34 copes fine. sysrq-t was responsive during the freeze, so I took a snapshot during it, file is attached. > I have no idea why and how to debug the behavior. > # CONFIG_PREEMPT_NONE is not set > CONFIG_PREEMPT_VOLUNTARY=y > # CONFIG_PREEMPT is not set My kernel has PREEMPT enabled. 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