linux-kernel - Re: 2.6.38 sbrk regression

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]

Date:	Thu, 14 Apr 2011 11:13:19 +0300
From:	raz ben yehuda <raziebe@...il.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	lkml <linux-kernel@...r.kernel.org>, riel@...hat.com,
	kosaki.motohiro@...fujitsu.com, akpm@...ux-foundation.org,
	Mel Gorman <mel@....ul.ie>
Subject: Re: 2.6.38 sbrk regression

Andrea Hello

I performed the second benchmark on 2.6.39-rc3, not 38. I am sorry for
the typo ( dell keyboard is too small ).

1. First benchmark was performed on 2.6.38, no compaction and with
slab=y. regression of 13% compared to 2.6.27

2. second benchmark was performed on 2.6.39-rc3, with compaction and
slab. resulted like 2.6.38, 13% regression compared to 2.6.27. So the
2.6.39-rc1 fix is probably related to something else.

3. It does not matter if i disable thp or not.  regression still exits.

I will update you more in following few days. 

thank you for your help.



On Wed, 2011-04-13 at 19:21 +0200, Andrea Arcangeli wrote:
> On Wed, Apr 13, 2011 at 05:06:19PM +0300, raz ben yehuda wrote:
> > ok, managed to build 38-rc3 ( keep forgetting make mrproper ).
> > problem is still there:
> 
> Oops I thought it was typo on your prev email so I didn't answer
> assuming you would test 39-rc like I suggested in my prev email, I
> really meant 2.6.39-rc3.
> 
> The fix I refer to is d527caf22e48480b102c7c6ee5b9ba12170148f7 and
> it's included in >= 2.6.39-rc1. 38-rc3 has THP but not this
> changeset. We tried to push it for 38 final but it was a bit late so
> it got merged immediately in 39-rc1 to stay on the safe side (it's
> only a performance issue and the other longstanding irq/sched latency
> issues in compaction that got fixed in 39-rc1 where actually more
> relevant than the compaction-kswapd removal).


--
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/