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 5E722C433EF for ; Mon, 29 Nov 2021 22:40:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233770AbhK2WoB (ORCPT ); Mon, 29 Nov 2021 17:44:01 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34884 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234786AbhK2WnT (ORCPT ); Mon, 29 Nov 2021 17:43:19 -0500 Received: from mail-qt1-x82f.google.com (mail-qt1-x82f.google.com [IPv6:2607:f8b0:4864:20::82f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 072E7C058169 for ; Mon, 29 Nov 2021 11:49:31 -0800 (PST) Received: by mail-qt1-x82f.google.com with SMTP id 8so17800349qtx.5 for ; Mon, 29 Nov 2021 11:49:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=toxicpanda-com.20210112.gappssmtp.com; s=20210112; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=77pIMPY0DRqIRNulPGyN+kaDHJuIP/tsohLoFAabMaA=; b=Ty40tdgepASovZT6ntq5Yakq5xpCnQoI0Bg6ZF10cH7cKK2i4s+NeZzyylqKmqiIEJ Lj5RQ87gbJZLzeMyUhgJ9Iqlc85/aOoLgNmkt+7theJhVmC29r7/lbA9UCp3TtBfhMK9 lDMcXjvDJM9Is7tpq4zdD4T68AHCVOTgwSQgpEuyE/56Gbl7AbZjS8EONZhK/QCrh+S8 YqA8tAR+bQcxK5eLdZlUFwD0UXggpzG2VaHFJzmSnDdK/0rBhQvyDqfEbU7/5W6WjvKj 4c50oZaPHTc6lh6huPAhoKWhWfAlgXsgmofI0HoiTgredobbidIrTGHxab/yZOO4NBw8 WjIA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=77pIMPY0DRqIRNulPGyN+kaDHJuIP/tsohLoFAabMaA=; b=3lj/Fgk1jTPnNIWA0+T7dVE7NoG5fgHrR1DxfP4SrqzXUi0145JQZpw9ulBgZpR1+A uxLYrI8mUW6SdOEoBn/TQx4I5B5jR81gcli+/adv7tL3MHiommV+3NXMzPlkeBmLGliP KYH06a3+NwU+jJid3TfwJ91dOiFe8B0568T2jNBisqGUzUl0L6K1dM2wxT5nHAXyIRVY g1ARj84NYOFIyD70QAZ0pLBlol4E8F6ceCNe8lwPW7x4sUHr7UnGlpdRx7I/obRgbi+g xCBjO6x6f+kI9A6kLG1fcMMRFvm2wdI+IwYJYARQx7JTR/CeDhr8Cfe2YbwuCdP6GqZC tP3A== X-Gm-Message-State: AOAM533JKvXaXKvJtYlTUsraRkLsA2ycLlgvdMsrUB5xBViHiNQcX7t5 8Pt+GNccyXe++VbMA/jbHSaajQ== X-Google-Smtp-Source: ABdhPJziQ539dzvCnkchJn9u/+4tbDzPDQH7IuKrDLjAQqJYz6yxO9OEWlzBrT4ymrzA649FVkCaEg== X-Received: by 2002:a05:622a:1005:: with SMTP id d5mr37693725qte.533.1638215369925; Mon, 29 Nov 2021 11:49:29 -0800 (PST) Received: from localhost (cpe-174-109-172-136.nc.res.rr.com. [174.109.172.136]) by smtp.gmail.com with ESMTPSA id h12sm8760663qkp.52.2021.11.29.11.49.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 29 Nov 2021 11:49:29 -0800 (PST) Date: Mon, 29 Nov 2021 14:49:28 -0500 From: Josef Bacik To: Valentin Schneider Cc: peterz@infradead.org, vincent.guittot@linaro.org, torvalds@linux-foundation.org, linux-kernel@vger.kernel.org, linux-btrfs@vger.kernel.org Subject: Re: [REGRESSION] 5-10% increase in IO latencies with nohz balance patch Message-ID: References: <87ee6yc00j.mognet@arm.com> <87bl22byq2.mognet@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87bl22byq2.mognet@arm.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Nov 29, 2021 at 06:31:17PM +0000, Valentin Schneider wrote: > On 29/11/21 13:15, Josef Bacik wrote: > > On Mon, Nov 29, 2021 at 06:03:24PM +0000, Valentin Schneider wrote: > >> Would you happen to have execution traces by any chance? If not I should be > >> able to get one out of that fsperf thingie. > >> > > > > I don't, if you want to tell me how I can do it right now. I've disabled > > everything on this box for now so it's literally just sitting there waiting to > > have things done to it. Thanks, > > > > I see you have Ftrace enabled in your config, so that ought to do it: > > trace-cmd record -e 'sched:*' -e 'cpu_idle' $your_test_cmd > http://toxicpanda.com/performance/trace.dat it's like 16mib. Enjoy, Josef