Re: Performance versus FreeBSD 7.0
From: Cyrus Massoumi
Date: Mon Mar 03 2008 - 14:02:22 EST
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@xxxxxxxxx>
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.
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