Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1764000AbYHDUhu (ORCPT ); Mon, 4 Aug 2008 16:37:50 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1763311AbYHDUhd (ORCPT ); Mon, 4 Aug 2008 16:37:33 -0400 Received: from rv-out-0506.google.com ([209.85.198.232]:38941 "EHLO rv-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1763216AbYHDUhc (ORCPT ); Mon, 4 Aug 2008 16:37:32 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=i4YoO3CB0/GAdwUnJMpV0/cNsbrS4f3UhekjNqvUlmqSxIy/lN/G/QGmXiIfZ0iYRd dKhbgCQBBb6Bk/rjvTknT5F4JXmTZ1fbBc6VhDfJsua18fWEQQbmhajbC6H4qQ9Dw4d3 f2PlkTzbAOJojdsya3iPWAru/ZHtZBcGo7OYU= Message-ID: Date: Mon, 4 Aug 2008 22:37:30 +0200 From: "Dushan Tcholich" To: "Robert Hancock" Subject: Re: ksoftirqd high cpu load on kernels 2.6.24 to 2.6.27-rc1-mm1 Cc: LKML , romieu@fr.zoreil.com, netdev@vger.kernel.org In-Reply-To: <48975BD3.6040709@shaw.ca> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <48975BD3.6040709@shaw.ca> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2186 Lines: 56 Hello On Mon, Aug 4, 2008 at 9:43 PM, Robert Hancock wrote: > Dushan Tcholich wrote: >> >> Hello >> >> This is my first bugreport on LKML so please be patient :) >> >> top always shows me that ksoftirqd usualy gets around 8%CPU, it >> changes between 6 and 10%. >> It's sometimes ksoftirqd/0 sometimes /1, differs on the reboot but >> doesn't change during work. >> I noticed it because it had very high time+, 500hours or so. >> I reproduced these problems with kernels 2.6.24 .25 and .27-rc1-mm1. I >> don't remember that this happened during .22 and .23 kernels, but I >> can check again if it's necessary. >> Timer freq is 1000Hz >> >> What I tried without changes with help from ##kernel: >> 1. built kernel without kvm; >> 2. disconnected all usb hw except mouse; >> 3. run glxgears which consumed 98% CPU and ksoftirqd 2%; >> 4. Tried to stress disk subsystem by copying a lot of small files on >> the same partition: >> time cp -R /usr/portage/* /tmp/1 >> real 2m17.530s >> user 0m0.764s >> sys 0m18.596s >> >> it was 127507 items 1.5GB, but just pdflush jumped to 14% from time to >> time; >> 5. disabled serial port in BIOS because my UPS was connected to it, >> and I suspected that it was maybe polling too much; >> 6. disconnected eth cable >> 7. tried googling but all I found is that some people had similar >> problem. Some TV cards were the culprit but I don't have that HW. >> >> If you need any more data please cc me as I'm not subscribed > > It would be useful to try running oprofile on an otherwise idle system and > see where it reports the CPU time is being used.. > I googled a little and found out that oprofile is a little above my head. So as I thought that some driver or HW might be responsible for this I tried to disable various onboard HW and found out that if I disable onboard ethernet problem dissapears, so now I've added netdev and maintainer of R8169 driver to cc. Thanks Dushan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/