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From: Robert Watson <rwatson@freebsd.org>
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Subject: Re: Possible Threading problem with -CURRENT / MySQL?
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On Wed, 16 Jun 2004, Robert Watson wrote:

> On Wed, 16 Jun 2004, Robert Watson wrote:
> 
> > Netperf-UP-giant                4902.41    14.3
> > Netperf-SMP-giant               2566.18    16.83
> > Netperf-UP-mpsafe               4799.35    22.04
> > Netperf-SMP-mpsafe              3022.51    18.06
> 
> FYI, when I add ADAPTIVE_MUTEXES on this box, the mean of 3000 q/s goes
> to 4000 q/s on the netperf+smp+mpsafenet number.
> 
> I'm off to bed now, but it seems like (at least in the HTT
> configuration), it makes a big difference.  I'll run the remainder of
> that set with ADAPTIVE_MUTEXES tomorrow as well. 

And switching to 4BSD from ULE takes the mean to 6426 q/s when combined
with netperf, smp, debug.mpsafenet=1, and adaptive mutexes. 

(Keeping in mind that this mysql benchmark is basically an
inter-thread/process kernel IPC benchmark using UNIX domain sockets, since
the workload is fairly minimal in userspace, this makes reasonable sense).

Now I'm really going to bed. 

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert@fledge.watson.org      Senior Research Scientist, McAfee Research