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

Kris Kennaway kris at
Tue May 24 15:14:07 PDT 2005

On Tue, May 24, 2005 at 11:50:07PM +0200, Matthias Buelow wrote:
> Kris Kennaway wrote:
> >>Hmm... atapci1 is shared with fxp0 on irq 20.. does fxp0 also require
> >>the giant lock?
> >
> >I don't think so..but the shared interrupt might still be causing some
> >other problem.  Try compiling a kernel without fxp support and see if
> >you still have the interactive problems under disk load.
> Ok, I now have tried a) with HTT switched off in BIOS, b) with HTT off
> and without the fxp driver (so that atapci1 is the only driver on irq
> 20) and c) on a Compaq notebook, all machines running 5.4-stable.
> Basically, the problem occurs in all 3 scenarios.

OK, thanks for confirming.  The next step is for you to try 6.0 with
debug.mpsafevfs=1 on a machine that exhibits the problem under 5.4, so
we can test whether the problem is caused by VFS being under Giant on

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