Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756176Ab1DLOAz (ORCPT ); Tue, 12 Apr 2011 10:00:55 -0400 Received: from mx2.fusionio.com ([64.244.102.31]:58632 "EHLO mx2.fusionio.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756080Ab1DLOAx (ORCPT ); Tue, 12 Apr 2011 10:00:53 -0400 X-ASG-Debug-ID: 1302616850-01de284cf81342b0001-xx1T2L X-Barracuda-Envelope-From: JAxboe@fusionio.com Message-ID: <4DA45B12.2090506@fusionio.com> Date: Tue, 12 Apr 2011 16:00:50 +0200 From: Jens Axboe MIME-Version: 1.0 To: Zdenek Kabelac CC: Pekka Enberg , Linux Kernel Mailing List , Linus Torvalds , Andrew Morton , Theodore Tso Subject: Re: regression - slow git rebase performance with 2.6.39-rcX kernel References: <4DA44E8B.9040101@fusionio.com> X-ASG-Orig-Subj: Re: regression - slow git rebase performance with 2.6.39-rcX kernel In-Reply-To: Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit X-Barracuda-Connect: mail1.int.fusionio.com[10.101.1.21] X-Barracuda-Start-Time: 1302616850 X-Barracuda-URL: http://10.101.1.181:8000/cgi-mod/mark.cgi X-Barracuda-Spam-Score: 0.00 X-Barracuda-Spam-Status: No, SCORE=0.00 using global scores of TAG_LEVEL=1000.0 QUARANTINE_LEVEL=1000.0 KILL_LEVEL=9.0 tests= X-Barracuda-Spam-Report: Code version 3.2, rules version 3.2.2.60643 Rule breakdown below pts rule name description ---- ---------------------- -------------------------------------------------- Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1575 Lines: 42 On 2011-04-12 15:59, Zdenek Kabelac wrote: > 2011/4/12 Jens Axboe : >> On 2011-04-12 14:51, Pekka Enberg wrote: >>> Hi, >>> >>> [ Fixed your empty CC list. ] >>> >>> On Tue, Apr 12, 2011 at 3:45 PM, Zdenek Kabelac >>> wrote: >>>> I'm noticing quite slower speed of my git rebase commands on my git >>>> tree compared with 2.6.38 kernel. >>>> I've T61 with SSD disc drive, ext4 fs, and by default deadline disk >>>> io scheduler >>>> The counter showing the number of 'rebased' patches on top of master >>>> is going much slower. >>>> When I boot 2.6.38 kernel it's much faster. >>>> >>>> Is it a known problem - or do I need to make a bisect ? >>> >>> No, I don't think it's a known problem. Git bisect would be helpful, >>> obviously. >> >> Definitely, interesting. Bisect would help. I'll try a similar workload >> here and see if I see any differences. How big is your rebase, and what >> are the runtimes (approximately) on .38 vs .39-rc? >> > > I've made just quick build with the small kernel without debug options > enable - and the time is then equal with 2.6.38. So the difference is > probably somewhere in debug build - I assume some debug option > slowed down between 2.6.38 - 2.6.39 significantly. Good, so it's down to debug. Thanks for testing. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/