Questions on the scheduler

[Oliver Herold]

Thanks :-)

Cheers, Oliver


On Sat, Sep 29, 2007 at 06:45:20PM +0200, Kris Kennaway wrote:
> Oliver Herold wrote:
>> Are there any numbers or technical papers? Just out of curiosity.
> 
> I ran a mysql benchmark against Dragonfly-current and FreeBSD 7 on an 
> 8-core machine (one of the workloads that FreeBSD now performs very well 
> at) and found 0 scaling on dragonfly.  Their developers confirmed that the 
> kernel is still entirely giant locked (as in FreeBSD 4) so no SMP 
> performance benefits are possible.
> 
> The email thread is here:
> 
>   http://leaf.dragonflybsd.org/mailarchive/users/2007-05/msg00134.html
> 
> although the linked graph is offline.  The FreeBSD curve was essentially 
> this one (FreeBSD has improved further since then):
> 
>   http://people.freebsd.org/~kris/scaling/scaling.png
> 
> with dragonfly a flat line at ~500 tps independent of load.
> 
> Kris
> 
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