From: Badari Pulavarty Subject: Re: 2.6.23-rc6: hanging ext3 dbench tests Date: Mon, 24 Sep 2007 11:01:58 -0700 Message-ID: <1190656918.13955.7.camel@dyn9047017100.beaverton.ibm.com> References: <20070911124202.GI9556@shadowen.org> <20070911173049.GA10499@shadowen.org> <20070914094905.GA32670@shadowen.org> <20070919181546.GA4343@shadowen.org> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: Linus Torvalds , sct@redhat.com, Andrew Morton , adilger@clusterfs.com, ext4 , lkml , mel@csn.ul.ie To: Andy Whitcroft Return-path: Received: from e35.co.us.ibm.com ([32.97.110.153]:59993 "EHLO e35.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755581AbXIXR7k (ORCPT ); Mon, 24 Sep 2007 13:59:40 -0400 In-Reply-To: <20070919181546.GA4343@shadowen.org> Sender: linux-ext4-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org Hi Andy, I managed to reproduce the dbench problem. (not sure if its the same thing or not - but symptoms are same). My problem has nothing to do with ext3. I can produce it on ext2, jfs also. Whats happening on my machine is .. dbench forks of 4 children and sends them a signal to start the work. 3 out of 4 children gets the signal and does the work. One of the child never gets the signal so, it waits forever in pause(). So, parent waits for a longtime to kill it. BTW, I was trying to find out when this problem started showing up. So far, I managed to track it to 2.6.23-rc4. (2.6.23-rc3 doesn't seem to have this problem). I am going to do bi-sect and find out which patch caused this. I am using dbench-2.0 which consistently reproduces the problem on my x86-64 box. Did you find anything new with your setup ? Thanks, Badari