Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757142Ab0FARj5 (ORCPT ); Tue, 1 Jun 2010 13:39:57 -0400 Received: from lennier.cc.vt.edu ([198.82.162.213]:40614 "EHLO lennier.cc.vt.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754948Ab0FARjz (ORCPT ); Tue, 1 Jun 2010 13:39:55 -0400 X-Mailer: exmh version 2.7.2 01/07/2005 with nmh-1.2 To: Avi Kivity Cc: Andi Kleen , Gleb Natapov , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, hpa@zytor.com, mingo@elte.hu, npiggin@suse.de, tglx@linutronix.de, mtosatti@redhat.com Subject: Re: [PATCH] use unfair spinlock when running on hypervisor. In-Reply-To: Your message of "Tue, 01 Jun 2010 19:52:28 +0300." <4C053ACC.5020708@redhat.com> From: Valdis.Kletnieks@vt.edu References: <20100601093515.GH24302@redhat.com> <87sk56ycka.fsf@basil.nowhere.org> <20100601162414.GA6191@redhat.com> <20100601163807.GA11880@basil.fritz.box> <4C053ACC.5020708@redhat.com> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="==_Exmh_1275413954_7824P"; micalg=pgp-sha1; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit Date: Tue, 01 Jun 2010 13:39:14 -0400 Message-ID: <10707.1275413954@localhost> X-Mirapoint-Received-SPF: 128.173.14.107 localhost Valdis.Kletnieks@vt.edu 2 pass X-Mirapoint-IP-Reputation: reputation=neutral-1, source=Fixed, refid=n/a, actions=MAILHURDLE SPF TAG X-Junkmail-Info: (45) HELO_LOCALHOST X-Junkmail-Status: score=45/50, host=vivi.cc.vt.edu X-Junkmail-SD-Raw: score=unknown, refid=str=0001.0A020203.4C0545C3.0062,ss=1,fgs=0, ip=0.0.0.0, so=2009-09-22 00:05:22, dmn=2009-09-10 00:05:08, mode=multiengine X-Junkmail-IWF: false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1146 Lines: 36 --==_Exmh_1275413954_7824P Content-Type: text/plain; charset=us-ascii On Tue, 01 Jun 2010 19:52:28 +0300, Avi Kivity said: > On 06/01/2010 07:38 PM, Andi Kleen wrote: > >>> Your new code would starve again, right? > > Try it on a NUMA system with unfair memory. > We are running everything on NUMA (since all modern machines are now > NUMA). At what scale do the issues become observable? My 6-month-old laptop is NUMA? Comes as a surprise to me, and to the perfectly-running NUMA=n kernel I'm running. Or did you mean a less broad phrase than "all modern machines"? --==_Exmh_1275413954_7824P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Exmh version 2.5 07/13/2001 iD8DBQFMBUXCcC3lWbTT17ARAktTAKDxJhvoEg58fPeXY/DeyFLB66fKjACguOeh DxByzoJ8PjkMUrR4ewnyqcc= =y9Gq -----END PGP SIGNATURE----- --==_Exmh_1275413954_7824P-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/