cvs commit: src/sys/kern kern_descrip.c

[Jeff Roberson]

On Mon, 23 Jul 2007, Attilio Rao wrote:

> 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 should also mention that he is fixing this problem as his SoC 
project.  I expect to see good gains once this is complete.

Thanks,
Jeff

>
> Attilio
>
>
> -- 
> Peace can only be achieved by understanding - A. Einstein
>