From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qc0-f182.google.com (mail-qc0-f182.google.com [209.85.216.182]) by kanga.kvack.org (Postfix) with ESMTP id 2E8C66B0038 for ; Mon, 24 Nov 2014 16:49:06 -0500 (EST) Received: by mail-qc0-f182.google.com with SMTP id r5so7699788qcx.27 for ; Mon, 24 Nov 2014 13:49:06 -0800 (PST) Received: from mail-qc0-x22f.google.com (mail-qc0-x22f.google.com. [2607:f8b0:400d:c01::22f]) by mx.google.com with ESMTPS id s67si17318316qgs.4.2014.11.24.13.49.03 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 24 Nov 2014 13:49:04 -0800 (PST) Received: by mail-qc0-f175.google.com with SMTP id b13so8462225qcw.34 for ; Mon, 24 Nov 2014 13:49:03 -0800 (PST) MIME-Version: 1.0 In-Reply-To: <20141123093348.GA16954@cucumber.anchor.net.au> References: <20141119012110.GA2608@cucumber.iinet.net.au> <20141119212013.GA18318@cucumber.anchor.net.au> <546D2366.1050506@suse.cz> <20141121023554.GA24175@cucumber.bridge.anchor.net.au> <20141123093348.GA16954@cucumber.anchor.net.au> From: Andrey Korolyov Date: Tue, 25 Nov 2014 01:48:42 +0400 Message-ID: Subject: Re: isolate_freepages_block and excessive CPU usage by OSD process Content-Type: text/plain; charset=UTF-8 Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org On Sun, Nov 23, 2014 at 12:33 PM, Christian Marie wrote: > Here's an update: > > Tried running 3.18.0-rc5 over the weekend to no avail. A load spike through > Ceph brings no perceived improvement over the chassis running 3.10 kernels. > > Here is a graph of *system* cpu time (not user), note that 3.18 was a005.block: > > http://ponies.io/raw/cluster.png > > It is perhaps faring a little better that those chassis running the 3.10 in > that it did not have min_free_kbytes raised to 2GB as the others did, instead > it was sitting around 90MB. > > The perf recording did look a little different. Not sure if this was just the > luck of the draw in how the fractal rendering works: > > http://ponies.io/raw/perf-3.10.png > > Any pointers on how we can track this down? There's at least three of us > following at this now so we should have plenty of area to test. Checked against 3.16 (3.17 hanged for an unrelated problem), the issue is presented for single- and two-headed systems as well. Ceph-users reported presence of the problem for 3.17, so probably we are facing generic compaction issue. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org