From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@bugzilla.kernel.org Subject: [Bug 16380] ext2/ext4 filesystem "hangs" for a few seconds when trying to write a lot of data to a freshly RW mounted FS Date: Sat, 4 Aug 2012 18:51:24 +0000 (UTC) Message-ID: <20120804185124.7F52511FC62@bugzilla.kernel.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" To: linux-ext4@vger.kernel.org Return-path: Received: from mail.kernel.org ([198.145.19.201]:46077 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753901Ab2HDSv3 (ORCPT ); Sat, 4 Aug 2012 14:51:29 -0400 Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id EC00620223 for ; Sat, 4 Aug 2012 18:51:26 +0000 (UTC) Received: from bugzilla.kernel.org (unknown [198.145.19.217]) by mail.kernel.org (Postfix) with ESMTP id 1BC9020204 for ; Sat, 4 Aug 2012 18:51:26 +0000 (UTC) In-Reply-To: Sender: linux-ext4-owner@vger.kernel.org List-ID: https://bugzilla.kernel.org/show_bug.cgi?id=16380 --- Comment #14 from Artem S. Tashkinov 2012-08-04 18:51:24 --- (In reply to comment #12) > I wasn't able to duplicate this with an underlying ext4 file system, with the > loop file system being ext2, using a 3.5 kernel on a system with 16G. > > I tried both using a variety of small and medium sized files, as well as one > very large file, and I didn't see any unexplained stuttering in write > bandwidth. (There were times when cp -r was clearly writing to the in-memory > page cache, and the writeback hadn't begone yet. There were also times when > we couldn't do any more writing, because we were busy reading from the source > drive. But it all looked pretty normal to me.) Hm, I cannot reproduce the problem with a loop device on top of tmpfs either, but I've just checked my 250GB ext4 partition and the bug is still there: When I try to copy a 3GB file (residing in tmpfs so it's all cached) to it, there's a 4 (four) seconds delay before a single byte gets written to the destination partition. After that all consequent files get written without any delays. -- Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are watching the assignee of the bug.