From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759526AbYDOR3f (ORCPT ); Tue, 15 Apr 2008 13:29:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752926AbYDOR30 (ORCPT ); Tue, 15 Apr 2008 13:29:26 -0400 Received: from ti-out-0910.google.com ([209.85.142.188]:48003 "EHLO ti-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752633AbYDOR3Y (ORCPT ); Tue, 15 Apr 2008 13:29:24 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=AaicEenSQv3jk0Q7Oc8Wqi5j+cQAxYdlQBi8RLBJvWvS+C+2ZHmeY+LJe7RJ4Wxs4BtXK84C9Gi1DRcnBZihrW4yDJVdmfpGekTerDv4ZcFmU1pDxHaZRvZLlLBvVxbhAm/NL1wLl3yW90M4Z3GcTuSiHwcWzB//EZjJSq17A/M= Message-ID: <91b13c310804151029re71c227g281e2966f0d1728a@mail.gmail.com> Date: Wed, 16 Apr 2008 01:29:21 +0800 From: "rae l" To: "Jeff Moyer" Subject: Re: iowait stability regressed from kernel 2.6.22 under heavy load of multi-thread aio writing/reading Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <91b13c310804110217g1d2c3ee4p69fee6fd43f4abd2@mail.gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Apr 15, 2008 at 9:37 PM, Jeff Moyer wrote: > > "rae l" writes: [...] > > Why doesn't bisecting work? Can you provide your test code so others > can verify your findings? just small C programs that use multi pthread aio_write, will be pasted soon, > > > by the way, a question is how to guarantee a kernel not regress under > > heavy multi-thread aio writing load? ltp project seems not give the > > answer: > > Well, providing your test code would be a step closer to achieving this > guarantee. If it is scriptable, then there is a chance we could > integrate it into the aio-dio regression test suite: > > http://git.kernel.org/?p=linux/kernel/git/zab/aio-dio-regress.git;a=summary this aio-dio-regress.git seems to use linux native aio system-call interface(shipped with libaio) only? but the POSIX aio (shipped with librt) implemented with pthread and pwrite system-call tests can also be added, the librt is the most cases when refered to aio. However, the test code will come soon. -- Denis