Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S269549AbUJLJQY (ORCPT ); Tue, 12 Oct 2004 05:16:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S269553AbUJLJQY (ORCPT ); Tue, 12 Oct 2004 05:16:24 -0400 Received: from mx2.elte.hu ([157.181.151.9]:60844 "EHLO mx2.elte.hu") by vger.kernel.org with ESMTP id S269549AbUJLJQO (ORCPT ); Tue, 12 Oct 2004 05:16:14 -0400 Date: Tue, 12 Oct 2004 11:17:40 +0200 From: Ingo Molnar To: Lee Revell Cc: linux-kernel , "K.R. Foley" , Rui Nuno Capela , Florian Schmidt , Mark_H_Johnson@raytheon.com, Fernando Pablo Lopez-Lezcano Subject: Re: [patch] voluntary-preempt-2.6.9-rc3-mm3-T3 Message-ID: <20041012091740.GA18736@elte.hu> References: <20040922103340.GA9683@elte.hu> <20040923122838.GA9252@elte.hu> <20040923211206.GA2366@elte.hu> <20040924074416.GA17924@elte.hu> <20040928000516.GA3096@elte.hu> <20041003210926.GA1267@elte.hu> <20041004215315.GA17707@elte.hu> <20041005134707.GA32033@elte.hu> <20041007105230.GA17411@elte.hu> <1097555404.1553.18.camel@krustophenia.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1097555404.1553.18.camel@krustophenia.net> User-Agent: Mutt/1.4.1i X-ELTE-SpamVersion: MailScanner 4.31.6-itk1 (ELTE 1.2) SpamAssassin 2.63 ClamAV 0.73 X-ELTE-VirusStatus: clean X-ELTE-SpamCheck: no X-ELTE-SpamCheck-Details: score=-4.9, required 5.9, autolearn=not spam, BAYES_00 -4.90 X-ELTE-SpamLevel: X-ELTE-SpamScore: -4 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1025 Lines: 32 * Lee Revell wrote: > Just to recap, these are the three problem areas that still produce > latencies over 500 usec on my machine. > > journal_clean_checkpoint_list you might want to send this trace to Andrew too - the primary master of ext3 latency-breaking. > rt_garbage_collect this one is still nasty and needs revisiting. > vga console > > I have found that the latter does not require switching back and forth > to X; anything that produces a lot of console output can trigger 500 > usec latencies. the vga console one we got rid of at a certain stage and it now resurfaced. The issue was doing VGA-text-RAM copies/memsets under the vga_lock. Maybe there were changes in vgacon recently that moved some of those back under the lock? Ingo - 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/