On Fri, Sep 29, 2006 at 11:05:35PM -0700, Paul Allen wrote: > >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.
It also seemed to show that nothing was really waiting for it (the cnt_* entries). Kris
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