Date: Mon, 26 Oct 2009 09:00:57 -0500 From: Jaime Bozza <jbozza@mindsites.com> To: Jacob Myers <jacob@whotookspaz.org>, Arnaud Houdelette <arnaud.houdelette@tzim.net> Cc: "freebsd-stable@freebsd.org" <freebsd-stable@freebsd.org> Subject: RE: Possible scheduler (SCHED_ULE) bug? Message-ID: <CF092998EA82AE4D83AF9C9ECA9A8BDE02EB411A93@ATLAS.msg.local> In-Reply-To: <4AE5A631.1030607@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> <4AE5A631.1030607@whotookspaz.org>
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From: Jacob Myers [mailto:jacob@whotookspaz.org] > Arnaud Houdelette wrote: > > 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 >=20 > I can confirm it happens without SMP on 7.2 and amd64. If you can give > it a try though, well, the more information the better. Any boundary > information, even approximate (well, mostly testing if 64K is the > boundary or if 1 MB or so is) would probably be good, too. I haven't tested the specific boundaries yet, but I will do that shortly. I *was* able to get a crash dump on the i386 system - Will post the details= shortly. My amd64 system is a test system with ZFS, so I couldn't get a crash dump. = Trying to work around that. On both systems, I used a 72K file (73,688 bytes) to test. Both systems wo= uld "lock up", and then a few seconds later kdb would come up. It wasn't = an immediate thing, at least not on the i386 system. I wasn't able to watc= h the amd64 system since it's too far away to time. Jaime
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