linux-kernel - Re: Linux 2.6.23

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:	Fri, 12 Oct 2007 08:21:59 -0400
From:	Bill Davidsen <davidsen@....com>
To:	linux-kernel@...r.kernel.org
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	Nicholas Miell <nmiell@...cast.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject:  Re: Linux 2.6.23

Ingo Molnar wrote:
> * Nick Piggin <nickpiggin@...oo.com.au> wrote:
> 
>> ;) I think you snipped the important bit:
>>
>> "the peak is terrible but it has virtually no dropoff and performs 
>> better under load than the default 2.6.21 scheduler." (verbatim)
> 
> hm, i understood that peak remark to be in reference to FreeBSD's 
> scheduler (which the FreeBSD guys are primarily interested in 
> obviously), not v2.6.21 - but i could be wrong.
> 
> In any case, there is indeed a regression with sysbench and a low number 
> of threads, and it's being fixed. The peak got improved visibly in 
> sched-devel:
> 
>   http://people.redhat.com/mingo/misc/sysbench-sched-devel.jpg
> 
> but there is still some peak regression left, i'm testing a patch for 
> that.
> 
There's one important bit missing from that graph, the 
2.6.23-SCHED_BATCH values. Without that we can't tell how much 
improvement is from sched-devel and how much from SCHED_BATCH. Clearly 
2.6.23 is better than 2.6.22.any in this test, the locking issues seem 
to dominate that difference to the point that nothing else would be 
informative.

This weekend I have to do some building of kernels for various machines, 
so I intend to run some builds SCHED_BATCH and some will just run. If I 
find anything interesting I'll report.

-- 
Bill Davidsen <davidsen@....com>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot

-
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/