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From: Cyrus Massoumi <cyrusm@gmx.net>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Diego Calleja <diegocg@gmail.com>,
	Stephen Cuppett <cuppett@gmail.com>,
	linux-kernel@vger.kernel.org, mingo@elte.hu,
	a.p.zijlstra@chello.nl
Subject: Re: Performance versus FreeBSD 7.0
Date: Mon, 03 Mar 2008 20:02:23 +0100	[thread overview]
Message-ID: <47CC4B3F.8060405@gmx.net> (raw)
In-Reply-To: <200803040004.52299.nickpiggin@yahoo.com.au>

Nick Piggin wrote:
> On Saturday 01 March 2008 01:54, Diego Calleja wrote:
>> El Fri, 29 Feb 2008 08:38:00 -0500, "Stephen Cuppett" <cuppett@gmail.com> 
> escribió:
>>> loads and 1500% at high loads. When compared with the best performing
>>> Linux kernel (2.6.22 or 2.6.24) performance is 15% better. Results are
>> There has been some performance problems with sysbench performance in linux
>> which made it slower than freebsd, there were some patches to speed things
>> up, not sure if they have been merged.
> 
> There definitely were performance problems with threaded malloc/free
> in the Linux kernel and glibc. Fixes have been merged in both packages,
> and AFAIK the FreeBSD guys tested with those fixes in place.
> 
> I think these were never really run into before in part due to MySQL's
> unscalable heap design makes it not scale well on higher numbers of
> CPUs anyway, and also made the malloc problems more pronounced (ie.
> they added a bit to the contention of the single heap lock, which is
> the big killer here).

IIRC, going to fine-grained file locking gave them a huge boost in this 
particular benchmark (and maybe others).
As I said on lwn.net Peter Zijlstra posted a patch to break the global 
file list lock about a year ago [1], but I don't think it was ever 
merged. Here [2] are some numbers for the patchset.

[1] http://lkml.org/lkml/2007/1/28/29
[2] http://lkml.org/lkml/2007/1/28/116

> But it was very nice to be made aware of the problem and be able to
> improve it.
> 
> 
>> Myself I find fun that they look at Linux as the Leader That Must Be
>> Surpassed. All the performance highlights of freebsd 7.0 are things that
>> linux already did some years ago.
> 
> I don't know very much about FreeBSD nor have verified the results
> for myself. But to their credit they seem to have done quite well at
> least on the smaller end of the scale.

  reply	other threads:[~2008-03-03 19:02 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-29 13:38 Stephen Cuppett
2008-02-29 14:54 ` Diego Calleja
2008-03-03 13:04   ` Nick Piggin
2008-03-03 19:02     ` Cyrus Massoumi [this message]
2008-03-03 19:24       ` Nick Piggin
2008-03-03 22:47         ` Cyrus Massoumi
2008-03-03 23:23       ` Andi Kleen
2008-03-04  5:51         ` Cyrus Massoumi
2008-03-06 12:53         ` Nick Piggin
2008-03-06 13:12           ` Andi Kleen
2008-03-03 12:34 ` Andi Kleen
2008-03-06 17:29 ` debian developer
2008-03-06 17:34   ` debian developer
     [not found] <a2dDb-60y-29@gated-at.bofh.it>
     [not found] ` <a2eSt-7UK-1@gated-at.bofh.it>
2009-01-25 10:07   ` Lx

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