From owner-freebsd-hackers@FreeBSD.ORG Sun Jul 13 23:11:24 2008 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 00AFC1065670 for ; Sun, 13 Jul 2008 23:11:24 +0000 (UTC) (envelope-from yanefbsd@gmail.com) Received: from fk-out-0910.google.com (fk-out-0910.google.com [209.85.128.191]) by mx1.freebsd.org (Postfix) with ESMTP id 874598FC1B for ; Sun, 13 Jul 2008 23:11:23 +0000 (UTC) (envelope-from yanefbsd@gmail.com) Received: by fk-out-0910.google.com with SMTP id k31so2641915fkk.11 for ; Sun, 13 Jul 2008 16:11:22 -0700 (PDT) Received: by 10.86.80.5 with SMTP id d5mr13237860fgb.26.1215977434146; Sun, 13 Jul 2008 12:30:34 -0700 (PDT) Received: by 10.86.51.1 with HTTP; Sun, 13 Jul 2008 12:30:34 -0700 (PDT) Message-ID: <7d6fde3d0807131230m598cf198ia1deded3afa1ac0c@mail.gmail.com> Date: Sun, 13 Jul 2008 12:30:34 -0700 From: "Garrett Cooper" To: "Eugene Grosbein" In-Reply-To: <20080713074730.GA93887@svzserv.kemerovo.su> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <4879563B.5090201@FreeBSD.org> <20080713074730.GA93887@svzserv.kemerovo.su> Cc: Nate Eldredge , freebsd-hackers@freebsd.org Subject: Re: SCHED_4BSD bad interactivity on 7.0 vs 6.3 X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 13 Jul 2008 23:11:24 -0000 On Sun, Jul 13, 2008 at 12:47 AM, Eugene Grosbein wrote: > On Sun, Jul 13, 2008 at 03:11:23AM +0200, Kris Kennaway wrote: > >> >It seems like there has been a regression in interactivity from >> >6.3-RELEASE to 7.0-RELEASE when using the SCHED_4BSD scheduler. After >> >upgrading my single-cpu amd64 box, 7.0 has much worse latency. When >> >running a kernel compile, there is a noticeable lag to echo my typing or >> >scroll my browser windows, and playing an mp3 frequently cuts out for a >> >second or two. This did not happen on 6.3-RELEASE. >> >> Are you sure it's not the x.org server bug that was present in the >> version shipped with 7.0? > > No, it's not. I have exactly the same problem with SCHED_4BSD > after upgrade from 6.3-STABLE to 7.0-STABLE. I didn't upgrade > my x.org 6.9.0, only OS (all 6.x compat shims are installed). > There is some sort of regression, certainly. IIRC some folks reported performance degradation using SCHED_4BSD in the past after the SMP fixes, so this isn't a new news story. SCHED_ULE isn't going to be default until 7.1-RELEASE I believe because they might be fanning out a few bugs in -CURRENT (the number of bugs are small from what I've seen) and MFC'ing them to 7-RELEASE. -Garrett