From owner-freebsd-current@FreeBSD.ORG Sun May 31 04:12:56 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 B164D106566B for ; Sun, 31 May 2009 04:12:56 +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 70E738FC16 for ; Sun, 31 May 2009 04:12:56 +0000 (UTC) (envelope-from bf2006a@yahoo.com) Received: (qmail 47610 invoked by uid 60001); 31 May 2009 04:12:56 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1243743176; bh=8JNMLZbOpJdmwmsq7t19mODiVdg802oelMuCf+u6YWU=; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:Cc:MIME-Version:Content-Type:Content-Transfer-Encoding; b=q97csoGEJtRSHoLNBbuapniS2t2h/ZiQmRJFPybMoPFSePW/J3chonKtXqU+6wzJHpbD/ebcJ/fQvC1bH4o1AEtFR+sjJnOtjFqUGJEKF/DeTZ8YnahIfI7zS7/7wwdVoCQdEu7MkIOxCcUCymGJ+8J7p95qtvUt6g0nCHkILhY= 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:Content-Transfer-Encoding; b=U3ZUX745EJaB6JxI5TCt8gbfJd+73bXGtJ8t0qdVepwY72ggBkmdkvmOUI6/raSeVDWdatMLqNK4bLPVJ1dg9+sVvc2HBkd4t/lUfVLOgblFYmWdUxLwsOdK+dt97D+iXQGIhQiiSY9ZBxYXWz+bxcEEMGRZjjylj2WrQLyK1h8=; Message-ID: <15091.46749.qm@web39108.mail.mud.yahoo.com> X-YMail-OSG: xR5qX08VM1lZYn4DiANOdo6008d.yx8.0Jli6OhJeRsjUqpx0NbGvCNBOotJB5VPyAKUowwR5rGRxB73kMXERxSmBpkrAAIKcYas7yAyPBBquVFfiriCJfafsOPz_zXAZewAue4qNJKX5pzwE_9PwDagxW5FKwSYhcNnmyuKxSXFNeJQ8ThE5PGSMa2wodpuaHLOm2fFRxK3IlHiyJj8mQq5ed1ThA5fivvGTBd5bEfVm2YhNXN7O598XE3EmMmAsADNyoNhBr3izFXb42ixy3QpZ3OevBr4YVAL_JD.MEN7lqEyqhe3MzBnq_8P1FE3Fnx8jGU- Received: from [94.76.247.138] by web39108.mail.mud.yahoo.com via HTTP; Sat, 30 May 2009 21:12:55 PDT X-Mailer: YahooMailClassic/5.3.9 YahooMailWebService/0.7.289.10 Date: Sat, 30 May 2009 21:12:55 -0700 (PDT) From: bf To: Kip Macy MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable X-Mailman-Approved-At: Sun, 31 May 2009 05:10:29 +0000 Cc: attilio@freebsd.org, ohartman@mail.zedat.fu-berlin.de, freebsd-current@freebsd.org 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 04:12:56 -0000 --- On Sat, 5/30/09, Kip Macy wrote: > From: Kip Macy > Subject: Re: signifanctly slowdown of FreeBSD 8.0-CURRENT/amd64 > To: "bf" > Cc: freebsd-current@freebsd.org, attilio@freebsd.org, ohartman@mail.zedat= .fu-berlin.de > Date: Saturday, May 30, 2009, 11:55 PM > > > > 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? =A0Or, counterintuitively, > would an SMP kernel > > be better in some ways? > > >=20 > He is trying to diagnose if the problem was introduced by > enabling > adaptive spinning on sx locks. They're only enabled on SMP > kernels. >=20 > Cheers, > Kip >=20 So I inferred from his request to have Oliver (the original poster) revert r193011. But it seems unlikely that this is solely or even mostly responsible for the slowdown, as Oliver reported that it first began to occur several weeks ago, and Attilio only committed r193011 on Friday -- unless Oliver independently added ADAPTIVE_SX to his custom kernel a few weeks ago. In any event, I'm still interested in any reports of the relative performance of SMP vs. UP kernels on UP hardware that=20 anyone is able to share. Thanks, b.=0A=0A=0A