>From Kris Kennaway <[EMAIL PROTECTED]>, Fri, Sep 29, 2006 at 09:42:42PM -0400:
> On Fri, Sep 29, 2006 at 08:34:39PM -0500, Craig Boston wrote:
> > On Fri, Sep 29, 2006 at 08:19:04PM -0500, Craig Boston wrote:
> > > On Thu, Sep 28, 2006 at 01:48:42PM -0600, Scott Long wrote:
> > > > http://people.freebsd.org/~scottl/usb_fastintr_RELENG_6.diff
> > >
> > > At first glance it appeared to work, but I'm about to do some more
> > > testing since I just discovered that I have to kldload something
> > > (anything) first in order to reproduce the problem. Weird.
> >
> > I can confirm that despite the other side effect I already mentioned,
> > this patch does fix or at least mask the problem I'm seing with em (and
> > probably usb).
>
> Which is odd since the hypothesis Scott was working on should have
> shown up clearly in the mutex trace, but did not.
But it is consistent with there being a beat-frequency problem with
respect to the scheduler. I think the number you really need is not
how long giant was held but how long was spent waiting for it.
Paul
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