From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1121EE7B5F9 for ; Wed, 4 Oct 2023 12:06:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233079AbjJDMGD (ORCPT ); Wed, 4 Oct 2023 08:06:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53644 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232912AbjJDMGA (ORCPT ); Wed, 4 Oct 2023 08:06:00 -0400 Received: from desiato.infradead.org (desiato.infradead.org [IPv6:2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 23F71A9 for ; Wed, 4 Oct 2023 05:05:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=5SMzdHJ+/8TCkE6AZwhEArOMBBJJHdiazKEqMlVBPvY=; b=oSj9JHUiYi70xvhTpCXNQIFxuh x4Q/Ha4ZtRwK37wJVrKOAH5RKZGshEZXnGBtYCNXTaNYxUEQoqWMNKqApz6Jw9z3OZeaxuVQsBqWQ WHCTMv2oAi5HXmiCCA5njsy2va1EBWTCRew5Rh6HgkoxCEszq9l2SN0Sq3VofFXg4y6i0nqTdCM2h Z1IjNitvuBkd7nRDzbkI4bNNMot2I+iL6FKyQ0AhWfp8FrAUp57L0FFlVmBz3SvWxTinXi4P/1vT3 TMYhs7DaDl00Sd98lkk4/lJ72m8rier8BIX2sktxyeBmgAZEeYBW9vsB8MN7XDPIMBPaUNVLqRWoY jDrbHcPw==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1qo0dL-00Am0Q-31; Wed, 04 Oct 2023 12:05:45 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 0413F300392; Wed, 4 Oct 2023 14:05:45 +0200 (CEST) Date: Wed, 4 Oct 2023 14:05:44 +0200 From: Peter Zijlstra To: Julia Lawall Cc: Ingo Molnar , Vincent Guittot , Dietmar Eggemann , Mel Gorman , linux-kernel@vger.kernel.org Subject: Re: EEVDF and NUMA balancing Message-ID: <20231004120544.GA6307@noisy.programming.kicks-ass.net> References: <20231003215159.GJ1539@noisy.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Oct 04, 2023 at 02:01:26PM +0200, Julia Lawall wrote: > > > On Tue, 3 Oct 2023, Peter Zijlstra wrote: > > > On Tue, Oct 03, 2023 at 10:25:08PM +0200, Julia Lawall wrote: > > > Is it expected that the commit e8f331bcc270 should have an impact on the > > > frequency of NUMA balancing? > > > > Definitely not expected. The only effect of that commit was supposed to > > be the runqueue order of tasks. I'll go stare at it in the morning -- > > definitely too late for critical thinking atm. > > Maybe it's just randomly making a bad situation worse rather than directly > introduing a problem. There is a high standard deviatind in the > performance. Here are some results with hyperfine. The general trends > are reproducible. OK,. I'm still busy trying to bring a 4 socket machine up-to-date... gawd I hate the boot times on those machines :/ But yeah, I was thinking similar things, I really can't spot an obvious fail in that commit. I'll go have a poke once the darn machine is willing to submit :-)