From owner-freebsd-current@FreeBSD.ORG Sun May 31 03:26:15 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 AD4651065674 for ; Sun, 31 May 2009 03:26:15 +0000 (UTC) (envelope-from bf2006a@yahoo.com) Received: from web39108.mail.mud.yahoo.com (web39108.mail.mud.yahoo.com [209.191.87.227]) by mx1.freebsd.org (Postfix) with SMTP id 6B9DD8FC0C for ; Sun, 31 May 2009 03:26:15 +0000 (UTC) (envelope-from bf2006a@yahoo.com) Received: (qmail 1422 invoked by uid 60001); 31 May 2009 02:59:33 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1243738772; bh=0vI5JqEODa/FQGs0jTqyCL4MPvBkjJFeRRRLqXKRRYc=; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:Cc:MIME-Version:Content-Type; b=ILYxE6RszyykQpDOPfAHvIYx59wVlHwbLF/byDC3Otk744Imq7xvmQffClPneSPptgGJ5ZGPaNk0ZFDBDSpPGQuMcRBjz8mP4zKE4Zy9GHBsg/1dxOra/EflT5WAkMow4VWmLrUOWCaIr07McxWuWZnCSENQOIWKcjhvdHry92w= DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:Cc:MIME-Version:Content-Type; b=Sf6WbYn9z/Adv3Y/V7ZMy6EhjQK7NgqmA6Jwx2a5EP2ieoT5jCXKBEvMACwxJUQlrq9fuNG+H2l508ThIpXOUejNUwrfBPC2cUud1LQpQkLJJ3EMub0fTppjlWDfUrzN8lT3pGz1fVSmeOKQMsYl7Vl0XuGwRdfanpdF3qFtR6U=; Message-ID: <951233.95131.qm@web39108.mail.mud.yahoo.com> X-YMail-OSG: K3TnU4QVM1kglo4GGdSougEZYuQI1iHHE.MPOsvG54BqrlSFaym9vPz__PBY3tSPXGu5y0bDQmn.Ob4u5biSWGZm5VqnFsu0gyEvUEsH5.S4AXTdu6AaTqtqf5wwZFYHkabVc2VmZ75jF08X4g6p.KmCXJTfyx2qxG5N7cGU87t5xBg8BBNRvLfjgP_vQgpItN3VW4BollJJWtboDPXxgCXwRfpgUqq3nkn.HviMKHWyIRqJJNWgc_COnLG57ACb1vu0VuqQUf_nXmWiEi01UamRsxl.PUDNdyfB.ioxbbsKNJ5WSVERT3Jxdll9WdmuhqEZMUNM Received: from [87.118.104.203] by web39108.mail.mud.yahoo.com via HTTP; Sat, 30 May 2009 19:59:32 PDT X-Mailer: YahooMailClassic/5.3.9 YahooMailWebService/0.7.289.10 Date: Sat, 30 May 2009 19:59:32 -0700 (PDT) From: bf To: freebsd-current@FreeBSD.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailman-Approved-At: Sun, 31 May 2009 03:52:50 +0000 Cc: attilio@FreeBSD.org, ohartman@mail.zedat.fu-berlin.de 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, 31 May 2009 03:26:16 -0000 >2009/5/30 Attilio Rao : >> 2009/5/30 O. Hartmann : >>> Attilio Rao wrote: >>>> 2009/5/30 O. Hartmann : >>>> >>>>> Hello. >>>>> I realized a significant slowdown of FreeBSD 8.0-CURRENT/amd64 on every >>>>> box I run. I have the most recent FreeBSD 8.0-CURRENT/amd64 with custom >>>>> kernel and switched off every debugging. I see a drastic slowdown >>>>> whenever heavy I/O on UFS2 and ZFS partitions is performed and whenever >>>>> some compilation is done (compiling world and kernel). ... >Also, did you compile the single-core athlon64 without the option SMP? > >Thanks, >Attilio I'm running the r193133 amd64 with a custom kernel and all debugging off on an AMD Athlon64 3400+ single-core, and I haven't noticed any significant slowing, although I haven't been doing any systematic benchmarking. What would be the penalties of running an SMP -CURRENT kernel on single-core hardware with no hyperthreading? Can anyone quantify the typical added overhead? Or, counterintuitively, would an SMP kernel be better in some ways? Regards, b.