Date: Wed, 16 Dec 2009 14:36:43 -0600 From: Jaime Bozza <jbozza@mindsites.com> To: Jacob Myers <jacob@whotookspaz.org> Cc: "freebsd-stable@freebsd.org" <freebsd-stable@freebsd.org>, Arnaud Houdelette <arnaud.houdelette@tzim.net> Subject: RE: Possible scheduler (SCHED_ULE) bug? Message-ID: <CF092998EA82AE4D83AF9C9ECA9A8BDE02F9A3B138@ATLAS.msg.local> In-Reply-To: <4AF18F3A.50804@whotookspaz.org> References: <CF092998EA82AE4D83AF9C9ECA9A8BDE02EB411A85@ATLAS.msg.local> <d5992baf0910231149qa4e89fdx2e1cde9b2a529cd3@mail.gmail.com> <CF092998EA82AE4D83AF9C9ECA9A8BDE02EB411A8E@ATLAS.msg.local> <4AE2232E.10406@whotookspaz.org> <CF092998EA82AE4D83AF9C9ECA9A8BDE02EB411A8F@ATLAS.msg.local> <4AE59FBE.6060904@tzim.net> <CF092998EA82AE4D83AF9C9ECA9A8BDE02EB411A99@ATLAS.msg.local> <4AF18F3A.50804@whotookspaz.org>
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> From: Jacob Myers [mailto:jacob@whotookspaz.org] > Jaime Bozza wrote: > > From: Arnaud Houdelette [mailto:arnaud.houdelette@tzim.net] > >> I haven't tried larger files - Maybe the boundary is different on amd6= 4? Doing some quick tests > >> right now, I was able to upload a 100MB file without a problem, but th= is is an AMD64 system with > SMP, > >> plus the filesystem is all ZFS, so there are too many things different= . I'll have to setup a > system > >> that closely mirrors the rest of my tests (UFS, ULE, no SMP, etc) befo= re I can say I'm not having a > >> problem there. > >>> Jaime > >>> > >> I had the same issue using 7.1 amd64, with ZFS, no SMP. > >> Not really sure what is the size boundary. I can't really test either, > >> as the machine is remote. > >> But I confirm that each tentative upload of certain relatively 'big' > >> files (around 1MB) with wordpress hanged the system before I switched > >> from sendfile to writev. > >> > >> I might do some test on amd64 7.2 with no SMP if it can be of any use = ? > >> > >> Arnaud > > > > I was able to duplicate the problem on 7.2-STABLE amd64 no SMP - Proble= m didn't seem to happen with > SMP on. While I wasn't able to get a crash dump, the crash looked simila= r. > > > > Jaime > > >=20 > FWIW, there was a fix committed for this: > http://svn.freebsd.org/viewvc/base?view=3Drevision&revision=3D198853 > See if it helps. Sorry for the delay in testing this - Everything seems to be working fine n= ow. I'm not able to force a lockup anymore under the same conditions. T= hanks for the fix! Jaime
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