From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754502AbaEFNZ0 (ORCPT ); Tue, 6 May 2014 09:25:26 -0400 Received: from casper.infradead.org ([85.118.1.10]:60925 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751771AbaEFNZW (ORCPT ); Tue, 6 May 2014 09:25:22 -0400 Date: Tue, 6 May 2014 15:25:16 +0200 From: Peter Zijlstra To: Rik van Riel Cc: Preeti Murthy , umgwanakikbuti@gmail.com, LKML , Morten Rasmussen , Ingo Molnar , george.mccollister@gmail.com, ktkhai@parallels.com, Preeti U Murthy Subject: Re: [PATCH RFC/TEST] sched: make sync affine wakeups work Message-ID: <20140506132516.GJ11096@twins.programming.kicks-ass.net> References: <20140502004237.79dd3de6@annuminas.surriel.com> <1399011219.5233.55.camel@marge.simpson.net> <53633B81.1080403@redhat.com> <53663565.9080306@redhat.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="mjrw6G9AoRBv8oQK" Content-Disposition: inline In-Reply-To: <53663565.9080306@redhat.com> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --mjrw6G9AoRBv8oQK Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Sun, May 04, 2014 at 08:41:09AM -0400, Rik van Riel wrote: > Even on 8-node DL980 systems, the NUMA distance in the > SLIT table is less than RECLAIM_DISTANCE, and we will > do wake_affine across the entire system. Yeah, so the problem is that (AFAIK) ACPI doesn't actually specify a metric for the SLIT distance. This (in as far as BIOS people would care to stick to specs anyhow) has lead to the 'fun' situation where BIOS engineers tweak SLIT table values to make OSes behave as they thing it should. So if the BIOS engineer finds that this system should have < RECLAIM_DISTANCE it will simply make the table such that the max SLIT value is below that. And yes, I've seen this :-( --mjrw6G9AoRBv8oQK Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAEBAgAGBQJTaOK7AAoJEHZH4aRLwOS6POQP/RYEAOLSE+6n+YvhuKQS+DNg FWtX5DBd+dQohIY3i3Bmj5Z+YGWaZePHzxp6N/fxwN9B6q6uBlMtM+CmrH7Z8HfX rOWvv8eFXaxE1r1+5qqpzXeyE8eAxF5ydagElgOcYg3rPY+SCxxH7hUKUKGBRqMA y8BHpDCK7hfas3LLARCqyCY6SHEMjTlmXtO2L7c9s4sxYHrcSayoBp96eA4WTnGD vCBTuOl7fommuQEHegZtaumNlrgql2M6yI+b3SvSRz3C5gJeCQ8NO5EdYE9cqMwF p3x3A6Bi4skL5vIIW5I3xWGVDIGelJOUgZRy+CsMvs+3+Vf3ff+5Kho2xKr8kCUq TJ+Sp8j9TpFabeI7wg37ExLzMSx2ogF8ep1eAjvVecdcAnjCAS7xN12pCzzShNIz 0EVoat0pPlM6s7jVEmcLCAUXJY0yOHzfK4irvj+qguM9a/0JRjKgWakljV+yHbyP Kq4wJsYzUrPPSotTVkeY4K1W9sJ7/JZGpaBO2RAML1Xw5EiniYQUTv+3n5x3qlYj rmaw9aZawp1Q+TMZzOsEfixuy6AXvnsYHYnKWrDe3S3/uOIsXW/4tEHTViwfeWVk xkNK4dCCi+w8UJUYs9/m6TvCkDx67kL6dRF9Qwz6jCTHnfyajuwT1N/fUhT7PORF 7Pg9jznAbLGKB/nn6Tqu =o3Dc -----END PGP SIGNATURE----- --mjrw6G9AoRBv8oQK--