From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from plane.gmane.org ([80.91.229.3]:54953 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933841AbbDVQJ3 (ORCPT ); Wed, 22 Apr 2015 12:09:29 -0400 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1YkxDI-0008Gn-Lk for linux-btrfs@vger.kernel.org; Wed, 22 Apr 2015 18:09:24 +0200 Received: from barriere.frankfurter-softwarefabrik.de ([217.11.197.1]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 22 Apr 2015 18:09:24 +0200 Received: from lvml by barriere.frankfurter-softwarefabrik.de with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 22 Apr 2015 18:09:24 +0200 To: linux-btrfs@vger.kernel.org From: Lutz Vieweg Subject: Re: [PATCH 0/4] btrfs: reduce block group cache writeout times during commit Date: Wed, 22 Apr 2015 18:09:18 +0200 Message-ID: References: <1428954759-1304912-1-git-send-email-clm@fb.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed In-Reply-To: <1428954759-1304912-1-git-send-email-clm@fb.com> Sender: linux-btrfs-owner@vger.kernel.org List-ID: On 04/13/2015 09:52 PM, Chris Mason wrote: > Large filesystems with lots of block groups can suffer long stalls during > commit while we create and send down all of the block group caches. The > more blocks groups dirtied in a transaction, the longer these stalls can be. > Some workloads average 10 seconds per commit, but see peak times much higher. Since we see this problem very frequently on some shared development servers, I will try to install this ASAP. Meanwhile, can anybody already tell success stories about successfully removing lags by this patch? Regards, Lutz Vieweg