From owner-freebsd-stable@FreeBSD.ORG Thu Dec 15 16:56:40 2011 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id BDDF31065689; Thu, 15 Dec 2011 16:56:40 +0000 (UTC) (envelope-from asmrookie@gmail.com) Received: from mail-ey0-f182.google.com (mail-ey0-f182.google.com [209.85.215.182]) by mx1.freebsd.org (Postfix) with ESMTP id A393F8FC13; Thu, 15 Dec 2011 16:56:39 +0000 (UTC) Received: by eaaf13 with SMTP id f13so3011475eaa.13 for ; Thu, 15 Dec 2011 08:56:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type; bh=Kek1F5J+opXNanowC4R0970JGtNQGCoNTh4rCJ7uQUs=; b=vwcrBfVBxoHdDZ0X9irxmOTnwQG2xiAdkINUqIRLpowzvqixyUK/v7XoJLnIAfhsfg nuFVtMU9qs+Gk0AZ49qunFN6W5nCAy3GG2qFgHS0grwgBAQDI7Z8tgIL/CKsWQ9V8a9B lUkWrQmoGkWfels9rs4vFz+4uz8LtlVhXZtFA= MIME-Version: 1.0 Received: by 10.216.131.152 with SMTP id m24mr1934372wei.56.1323968198451; Thu, 15 Dec 2011 08:56:38 -0800 (PST) Sender: asmrookie@gmail.com Received: by 10.216.171.8 with HTTP; Thu, 15 Dec 2011 08:56:38 -0800 (PST) In-Reply-To: <4EEA25BB.7040706@sentex.net> References: <4EE1EAFE.3070408@m5p.com> <4EE22421.9060707@gmail.com> <4EE6060D.5060201@mail.zedat.fu-berlin.de> <4EE69C5A.3090005@FreeBSD.org> <20111213104048.40f3e3de@nonamehost.> <20111213230441.GB42285@stack.nl> <4ee7e2d3.0a3c640a.4617.4a33SMTPIN_ADDED@mx.google.com> <4EE8D607.1000504@sentex.net> <4EEA227E.7080704@sentex.net> <4EEA25BB.7040706@sentex.net> Date: Thu, 15 Dec 2011 17:56:38 +0100 X-Google-Sender-Auth: eN811JKam6VzmdGL06meH8StiGo Message-ID: From: Attilio Rao To: Mike Tancsa Content-Type: text/plain; charset=UTF-8 Cc: Ivan Klymenko , mdf@freebsd.org, Doug Barton , freebsd-stable@freebsd.org, Jilles Tjoelker , "O. Hartmann" , Current FreeBSD , freebsd-performance@freebsd.org Subject: Re: SCHED_ULE should not be the default X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Dec 2011 16:56:40 -0000 2011/12/15 Mike Tancsa : > On 12/15/2011 11:42 AM, Attilio Rao wrote: >> >> I'm thinking now to a better test-case for this: can you try that on a >> tmpfs volume? > > There is enough RAM in the box so that it should not touch the disk, and > I was sending the output to /dev/null, so it was not writing to the disk. > >> >> Also what filesystem you were using? > > UFS > >> How many CPUs were in place? > > 4 > >> Did you reboot before to move the steal_thresh value? > > No. So, as very first thing, can you try the following: - Same codebase, etc. etc. - Make the test 4 times, discard the first and ministat for the other 3 - Reboot - Change the steal_thresh value - Make the test 4 times, discard the first and ministat for the other 3 Then report discarded values and the ministated one and we will have more informations I guess (also, I don't think devfs contention should play a role here, thus nevermind about it for now). Thanks, Attilio -- Peace can only be achieved by understanding - A. Einstein