CALL FOR TESTERS! [Re: 6.2 SHOWSTOPPER - em completely unusable on 6.2]

Kris Kennaway kris at obsecurity.org
Sat Sep 30 11:39:08 PDT 2006


On Fri, Sep 29, 2006 at 11:05:35PM -0700, Paul Allen wrote:
> >From Kris Kennaway <kris at obsecurity.org>, 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.

It also seemed to show that nothing was really waiting for it (the
cnt_* entries).

Kris
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