cvs commit: src/sys/kern kern_descrip.c

[Attilio Rao]

2007/7/23, Jeremie Le Hen <jeremie at le-hen.org>:
> Hi Jeff,
>
> On Tue, Jul 03, 2007 at 02:27:51PM -0700, Jeff Roberson wrote:
> >  For the curious, these last two patches make a substantial improvement to
> >  mysql write performance on my 8way opteron:
> >
> >  http://people.freebsd.org/~jeff/mysqlwrite.png
> >
> >  The green line is without and the blue line is with.
>
> Just for information, do you have any hint why Linux eventually
> performs better above 18 threads?

IIRC, this workload is lockmgr() dominated now, which is particulary
unlucky for us since they are very heavy.

Attilio


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