Possible scheduler (SCHED_ULE) bug?

[Jaime Bozza]

From: Jacob Myers [mailto:jacob at 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
> 
> 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 would "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 watch the amd64 system since it's too far away to time.

Jaime