Possible Threading problem with -CURRENT / MySQL?
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
> >> - Using ADAPTIVE_MUTEXES
> > 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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