Performance of 4.x vs 5.x (Re: Lifetime of FreeBSD branches)

Kris Kennaway kris at
Tue May 24 09:19:47 PDT 2005

On Tue, May 24, 2005 at 04:37:26PM +0200, Krzysztof Kowalik wrote:
> Kris Kennaway [kris at] wrote:
> > [...]  One obvious guess is that it's due to VFS being under Giant,
> > which causes lots of contention with other subsystems that also
> > require Giant, and therefore introduces latency.  If so, you'd see a
> > substantial performance improvement on 6.0 with debug.mpsafevfs=1.
> I didn't see any visible difference, in the given scenario of
> uncompressing firefox's sources, when tried mpsafevfs's patches when
> they got announced on current at .

There have been a *lot* of changes in this area since the initial
patches (i.e. continued removal of Giant), so you'd really need to
re-test on a recent version of 6.0 to be definitive.

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