From owner-freebsd-current@FreeBSD.ORG Sun Jun 28 17:51:35 2009 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 370B71065670; Sun, 28 Jun 2009 17:51:35 +0000 (UTC) (envelope-from asmrookie@gmail.com) Received: from mail-bw0-f210.google.com (mail-bw0-f210.google.com [209.85.218.210]) by mx1.freebsd.org (Postfix) with ESMTP id 7FE548FC08; Sun, 28 Jun 2009 17:51:34 +0000 (UTC) (envelope-from asmrookie@gmail.com) Received: by bwz6 with SMTP id 6so416585bwz.43 for ; Sun, 28 Jun 2009 10:51:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:sender:received:in-reply-to :references:date:x-google-sender-auth:message-id:subject:from:to:cc :content-type:content-transfer-encoding; bh=syNwAOWNqA19Vf4FDgXNbxctIp5/EftxpMdsXe+uE+Y=; b=CgRXhhpZ1azb0ldBhNufguIEkxhJwYRUK5jzR3+RqAGmwNN0t5Xm34+9vQ/GttIopi Kjgs/C7S7ucUwr8SpO5UY7bwwSHdPX5q4NnkUh3PY3lS5bWWTvJoXFIe86mH8NxVp2wN mbn814TagTkGUV3kApDnYB0RvIXgy7vDpqL2E= DomainKey-Signature: a=rsa-sha1; c=nofws; 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 :content-transfer-encoding; b=ktdSyBbxpZQ+1Ky3oqiB1A5MrBRbRcUY7HbxaqrzlsFyQzq32LssbW5PKAQ1C14ROQ goOOjo5djQO6rzj0bwpLzR9dSAUWtKEjp5Do5v/1Oy+Vf5ut502XjMGvoGUt68goj8Sv TGTim+2vutREVijc5xx6LI6KMgy7sH2tqJJqk= MIME-Version: 1.0 Sender: asmrookie@gmail.com Received: by 10.223.115.80 with SMTP id h16mr4021668faq.94.1246211493272; Sun, 28 Jun 2009 10:51:33 -0700 (PDT) In-Reply-To: <2BE0378C-96A3-4714-A5C3-7B1A6AA0DCE2@lakerest.net> References: <951233.95131.qm@web39108.mail.mud.yahoo.com> <3c1674c90905302055g542cfadarf201cc273639977d@mail.gmail.com> <4A23919F.8050905@mail.zedat.fu-berlin.de> <4A2B3040.7020509@poildetroll.net> <3bbf2fe10906070339k663bace7qe5142702248ce6c9@mail.gmail.com> <4A2BBDC0.6000801@poildetroll.net> <3bbf2fe10906070623o65ce021fkb7f59fe1924cc1ec@mail.gmail.com> <4A353E21.1080001@poildetroll.net> <2BE0378C-96A3-4714-A5C3-7B1A6AA0DCE2@lakerest.net> Date: Sun, 28 Jun 2009 19:51:33 +0200 X-Google-Sender-Auth: 74da3dc5546bdc71 Message-ID: <3bbf2fe10906281051k1da8d1edwc49388e30d3df492@mail.gmail.com> From: Attilio Rao To: Randall Stewart Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: bf , "O. Hartmann" , freebsd-current@freebsd.org, Pierre Guinoiseau , Kip Macy Subject: Re: signifanctly slowdown of FreeBSD 8.0-CURRENT/amd64 X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 28 Jun 2009 17:51:35 -0000 2009/6/24 Randall Stewart : > One thing I have noticed for a while.. and have not > been able to track down.. > > If one runs > > /usr/src/tools/tools/syscall_timing/syscall_timing > > On a 7.2 kernel and compare it on the same machine to an 8.0 kernel > you will see almost a 3x slow down in 8. So, as long as I think that for the pressing, next release, it is very important to track such regressions down, I hope both Pierre and Randall want to lend an hand. First thing, Randall, could you recompile your kernel with HWPMC_HOOKS, device hwpmc, and do some pmcstat runs in order to see where/how the slowdown happens? For example you could check if the number of cache misses increases, or similar. Both could provide, instead, once the slowdown takes place, verbose top, ps and possibly vmstat, just to be sure in case. If you are unable to reproduce the slowdown or give an hand, please let me know. Thanks, Attilio -- Peace can only be achieved by understanding - A. Einstein