Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751749AbWCUOyK (ORCPT ); Tue, 21 Mar 2006 09:54:10 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751750AbWCUOyJ (ORCPT ); Tue, 21 Mar 2006 09:54:09 -0500 Received: from mx3.mail.elte.hu ([157.181.1.138]:36578 "EHLO mx3.mail.elte.hu") by vger.kernel.org with ESMTP id S1751748AbWCUOyI (ORCPT ); Tue, 21 Mar 2006 09:54:08 -0500 Date: Tue, 21 Mar 2006 15:52:02 +0100 From: Ingo Molnar To: Willy Tarreau Cc: Con Kolivas , Mike Galbraith , lkml , Andrew Morton , bugsplatter@gmail.com Subject: Re: interactive task starvation Message-ID: <20060321145202.GA3268@elte.hu> References: <1142592375.7895.43.camel@homer> <200603220119.50331.kernel@kolivas.org> <1142951339.7807.99.camel@homer> <200603220130.34424.kernel@kolivas.org> <20060321143240.GA310@elte.hu> <20060321144410.GE26171@w.ods.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20060321144410.GE26171@w.ods.org> User-Agent: Mutt/1.4.2.1i X-ELTE-SpamScore: 0.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=0.0 required=5.9 tests=AWL autolearn=no SpamAssassin version=3.0.3 0.0 AWL AWL: From: address is in the auto white-list X-ELTE-VirusStatus: clean Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1235 Lines: 28 * Willy Tarreau wrote: > Ah no, I never use those montruous environments ! xterm is already > heavy. [...] [ offtopic note: gnome-terminal developers claim some massive speedups in Gnome 2.14, and my experiments on Fedora rawhide seem to corraborate that - gnome-term is now faster (for me) than xterm. ] > [...] don't you remember, we found that doing "ls" in an xterm was > waking the xterm process for every single line, which in turn woke the > X server for a one-line scroll, while adding the "|cat" acted like a > buffer with batched scrolls. Newer xterms have been improved to > trigger jump scroll earlier and don't exhibit this behaviour even on > non-patched kernels. However, sshd still shows the same problem IMHO. yeah. The "|cat" changes the workload, which gets rated by the scheduler differently. Such artifacts are inevitable once interactivity heuristics are strong enough to significantly distort the equal sharing of CPU time. 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/