From mboxrd@z Thu Jan 1 00:00:00 1970 From: Valdis.Kletnieks@vt.edu Subject: Re: [PATCH] use unfair spinlock when running on hypervisor. Date: Tue, 01 Jun 2010 13:39:14 -0400 Message-ID: <10707.1275413954@localhost> 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 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 To: Avi Kivity Return-path: In-Reply-To: Your message of "Tue, 01 Jun 2010 19:52:28 +0300." <4C053ACC.5020708@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org --==_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--