Date: Fri, 29 Sep 2006 23:05:35 -0700 From: Paul Allen <pallen@ugcs.caltech.edu> To: Kris Kennaway <kris@obsecurity.org> Cc: freebsd-stable@freebsd.org, Craig Boston <craig@feniz.gank.org> Subject: Re: CALL FOR TESTERS! [Re: 6.2 SHOWSTOPPER - em completely unusable on 6.2] Message-ID: <20060930060535.GA3467@riyal.ugcs.caltech.edu> In-Reply-To: <20060930014242.GB42433@xor.obsecurity.org> References: <20060927210349.GG14975@tnn.dglawrence.com> <451AEB02.2090806@samsco.org> <002201c6e290$45ece980$b3db87d4@multiplay.co.uk> <451BD89F.8080203@samsco.org> <451C1F6D.2020302@mail.uni-mainz.de> <7.0.1.0.0.20060928152807.17bbe448@sentex.net> <451C271A.9040904@samsco.org> <20060930011904.GA62626@nowhere> <20060930013439.GB62626@nowhere> <20060930014242.GB42433@xor.obsecurity.org>
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>From Kris Kennaway <kris@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. Paul
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