From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266611AbUG0U0V (ORCPT ); Tue, 27 Jul 2004 16:26:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266607AbUG0U0V (ORCPT ); Tue, 27 Jul 2004 16:26:21 -0400 Received: from mail1.slu.se ([130.238.96.11]:7354 "EHLO mail1.slu.se") by vger.kernel.org with ESMTP id S266605AbUG0UYS (ORCPT ); Tue, 27 Jul 2004 16:24:18 -0400 From: Robert Olsson MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <16646.47585.814327.628319@robur.slu.se> Date: Tue, 27 Jul 2004 22:24:01 +0200 To: Pasi Sjoholm Cc: Robert Olsson , Francois Romieu , H?ctor Mart?n , Linux-Kernel , , , , Subject: Re: ksoftirqd uses 99% CPU triggered by network traffic (maybe RLT-8139 related) In-Reply-To: References: <16646.14381.740376.204381@robur.slu.se> X-Mailer: VM 7.18 under Emacs 21.3.1 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Pasi Sjoholm writes: > Yeah, when the ksoftirqd is taking all the cpu it will be like that, but > when the kernel is behaving normally the starving diff is between 0->1sec. Well ksoftirqd makes your kernel load just visible which is good and ksofirqd gets accounted for this when softirq's get deferred to it. It may look like goes from 0 to 100% but thats probably not the case. The problem is we can starve userland at high loads. As said we were trying some way to cure this I may have some old patch if you like to try. Cheers. --ro