Possible scheduler (SCHED_ULE) bug?
jacob at whotookspaz.org
Wed Nov 4 14:27:59 UTC 2009
Jaime Bozza wrote:
> From: Arnaud Houdelette [mailto:arnaud.houdelette at tzim.net]
>> I haven't tried larger files - Maybe the boundary is different on amd64? Doing some quick tests
>> right now, I was able to upload a 100MB file without a problem, but this 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) before I can say I'm not having a
>> problem there.
>> 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 ?
> I was able to duplicate the problem on 7.2-STABLE amd64 no SMP - Problem didn't seem to happen with SMP on. While I wasn't able to get a crash dump, the crash looked similar.
FWIW, there was a fix committed for this:
See if it helps.
Jacob Myers <Jacob at whotookspaz.org> | Website: http://whotookspaz.org
Network Admin, Wilcox Technologies | Public key: 186A424A
Using FreeBSD since 2007 | Public shell: http://bit.ly/42iGCR
Answer a fool according to his folly, lest he be wise in his own conceit
-- Proverbs, 26:5
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