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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <BANLkTimJDxZ4qBRNnwE9L=3bfEU0WOhd6A@mail.gmail.com>
Date:	Tue, 12 Apr 2011 15:59:53 +0200
From:	Zdenek Kabelac <zdenek.kabelac@...il.com>
To:	Jens Axboe <jaxboe@...ionio.com>
Cc:	Pekka Enberg <penberg@...nel.org>,
	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

2011/4/12 Jens Axboe <jaxboe@...ionio.com>:
> 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?
>

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.

Zdenek
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/