Date: Sat, 30 Sep 2006 14:39:06 -0400 From: Kris Kennaway <kris@obsecurity.org> To: Paul Allen <pallen@ugcs.caltech.edu> Cc: freebsd-stable@freebsd.org, Craig Boston <craig@feniz.gank.org>, Kris Kennaway <kris@obsecurity.org> Subject: Re: CALL FOR TESTERS! [Re: 6.2 SHOWSTOPPER - em completely unusable on 6.2] Message-ID: <20060930183906.GA76658@xor.obsecurity.org> In-Reply-To: <20060930060535.GA3467@riyal.ugcs.caltech.edu> References: <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> <20060930060535.GA3467@riyal.ugcs.caltech.edu>
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--gKMricLos+KVdGMg Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Sep 29, 2006 at 11:05:35PM -0700, Paul Allen wrote: > >From Kris Kennaway <kris@obsecurity.org>, Fri, Sep 29, 2006 at 09:42:42P= M -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 > > > >=20 > > > > 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. > > >=20 > > > 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 (a= nd > > > probably usb). > >=20 > > Which is odd since the hypothesis Scott was working on should have > > shown up clearly in the mutex trace, but did not. >=20 > But it is consistent with there being a beat-frequency problem with=20 > 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 --gKMricLos+KVdGMg Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (FreeBSD) iD8DBQFFHrnJWry0BWjoQKURAqDhAKCfmFLkp/RP8zGIw+LK6U0ctNUB+QCbB/4x 1RhJiOxF1g0CwzF1Tf/Ab5w= =uFXF -----END PGP SIGNATURE----- --gKMricLos+KVdGMg--
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