From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Biereigel Subject: Re: Interrupt latency on some 945GM platforms Date: Mon, 27 Sep 2010 07:45:58 +0200 Message-ID: <4CA02F96.2000508@biereigel-wb.de> References: <201009132336.17310.anarsoul@gmail.com> <201009162306.59508.anarsoul@gmail.com> <20100924123901.243c85e1@jbarnes-desktop> <201009242248.36554.anarsoul@gmail.com> <20100924125153.4fdf0c1b@jbarnes-desktop> <4C9F262F.7030709@biereigel-wb.de> Mime-Version: 1.0 Content-Type: text/plain; charset=KOI8-R Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: Shaohua Li Cc: linux-kernel@vger.kernel.org, Vasily Khoruzhick , Thomas Gleixner , Sitsofe Wheeler , Venkatesh Pallipadi , intel-gfx@lists.freedesktop.org, Len Brown , Jesse Barnes List-Id: intel-gfx@lists.freedesktop.org Hello Everyone, >> just to add on to reports of this problem, there was a Thread here in LKML >> some months ago targeting the same problem (but not really attacking it at >> the Chipset driver). As I have one of those Laptops with a 945GM-Chipset and >> am stuck with the same Problem (disabled tickless now as a workaround and >> set ticks to 1000) I could maybe do some testing of patches. >> So what I can summarize is what the others did before: Disabling CPU1 helps, >> adding nohz=off helps, changing the Clocksource afterwards helps, binding >> the Interrupt does NOT help. >> So here's the Link to the old Discussion with follow-ups, maybe you can get >> some furter information from there. >> http://linux.derkeiler.com/Mailing-Lists/Kernel/2010-05/msg03696.html >> We targeted the BIOS itself as everyone in this thread happened to own an >> Phoenix BIOS with some special version string. >> best, Stefan >> > does disable msi help with 'pci=nomsi'? > No, here it doesn't.