Possible Threading problem with -CURRENT / MySQL?

Robert Watson rwatson at freebsd.org
Thu Jun 17 12:54:09 GMT 2004

On Thu, 17 Jun 2004, Petri Helenius wrote:

> Brad Knowles wrote:
> >>  - Disabling HTT
> >
> >     These both sound like typical improvements, based on what I've 
> > seen on this list.  Any ideas on when they might become the default?
> >
> HTT defaults to the BIOS setting, which I think is the logical course of 
> action. I don´t think the OS should make assumptions the way or another 
> over what the user has set in the BIOS.
> (this used not to be the case earlier, and I asked it to default to 
> disable HTT back then)

I agree in principle; however, as a variable in this benchmark, it seems
like regardless of scheduler it's a net loss.  A question we haven't yet
answered is whether (for this workload, or other interesting workloads) it
should be a net loss, and therefore whether it's simply our support to HTT
is not yet mature enough to offer the theoretical advantage, or whether
HTT is just a bad idea. :-)

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

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