Possible scheduler (SCHED_ULE) bug?

[Jaime Bozza]

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.
> >
> > 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 - Problem didn't seem to happen with SMP on.  While I wasn't able to get a crash dump, the crash looked similar.

Jaime