linux-kernel - Re: regression - slow git rebase performance with 2.6.39-rcX kernel

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Date:	Tue, 12 Apr 2011 15:07:23 +0200
From:	Jens Axboe <jaxboe@...ionio.com>
To:	Pekka Enberg <penberg@...nel.org>
CC:	Zdenek Kabelac <zdenek.kabelac@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Theodore Tso <tytso@....edu>
Subject: Re: regression - slow git rebase performance with 2.6.39-rcX kernel

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
> <zdenek.kabelac@...il.com> 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?

-- 
Jens Axboe

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