From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755703Ab0JSSxh (ORCPT ); Tue, 19 Oct 2010 14:53:37 -0400 Received: from mailout-de.gmx.net ([213.165.64.22]:34337 "HELO mail.gmx.net" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with SMTP id S1752006Ab0JSSxg (ORCPT ); Tue, 19 Oct 2010 14:53:36 -0400 X-Authenticated: #14349625 X-Provags-ID: V01U2FsdGVkX1/9i8wXZc39OzIRk7QapXGgPluLS4KNU+fo1hdVNZ Qr5tFBX9zV5vtA Subject: Re: [RFC/RFT PATCH] sched: automated per tty task groups From: Mike Galbraith To: Linus Torvalds Cc: LKML , Ingo Molnar , Peter Zijlstra , Mathieu Desnoyers In-Reply-To: <1287511983.7417.45.camel@marge.simson.net> References: <1287479765.9920.9.camel@marge.simson.net> <1287487757.24189.40.camel@marge.simson.net> <1287511983.7417.45.camel@marge.simson.net> Content-Type: text/plain Date: Tue, 19 Oct 2010 20:53:30 +0200 Message-Id: <1287514410.7368.10.camel@marge.simson.net> Mime-Version: 1.0 X-Mailer: Evolution 2.24.1.1 Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > On Tue, 2010-10-19 at 08:28 -0700, Linus Torvalds wrote: > > > > If people compare with a non-CGROUP_SCHED > > kernel, will a desktop-optimized kernel suddenly have horrible pipe > > latency due to much higher scheduling cost? Right now that whole > > feature is hidden by EXPERIMENTAL, I don't know how much it hurts, and > > I never timed it when I tried it out long ago.. Q/D test of kernels w/wo, with same .config using pipe-test (pure sched) gives on my box ~590khz with tty_sched active, 620khz without cgroups acitve in same kernel/config without patch. last time I measured stripped down config (not long ago, but not yesterday either) gave max ctx rate ~690khz on this box. (note: very Q, very D numbers, no variance testing, ballpark) -Mike