Date: Sun, 26 Mar 2000 15:30:03 +0200 From: Dave Boers <djb@relativity.student.utwente.nl> To: Bart van Leeuwen <bart@ixori.demon.nl> Cc: freebsd-smp@freebsd.org Subject: Re: SMP and vn Message-ID: <20000326153003.A413@relativity.student.utwente.nl> In-Reply-To: <38CFF347.865CFD63@ixori.demon.nl>; from bart@ixori.demon.nl on Wed, Mar 15, 2000 at 07:32:07PM -0100 References: <38CFF347.865CFD63@ixori.demon.nl>
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It is rumoured that Bart van Leeuwen had the courage to say:
> In any case, it looks to me that SMP + vnode + heavy load == freeze.
For me: SMP + sit_and_wait_for_5_days_or_so == freeze.
> Is there anyone with simular experience? is there anything documented
> about using vn on smp systems?
I've got the same symptoms. I don't have the vn device in my kernel though
and I can't seem to trigger the hang with a heavy load. I am running Abit
BP6 with two 400 Mhz Celerons (not overclocked) and 128 Mb of RAM.
I haven't been able to get an uptime > 10 days since Christmas or so. I
used to track 4.0-current, but now I'm running RELENG_4; with the same
problems still.
The hangs are _complete_. There's no getting into the debugger, the system
won't respond to console/serial terminal/network/whatever.
I tried to duplicate the situation by configuring a single processor
Pentium II machine with _very_ similar hardware and the exact same kernel
configuration (it has 384 Mb ram though). That one has now been running for
16 days without a problem, so it definitely seems SMP related.
I turned off softupdates on all my filesystems, but it doesn't seem related
to the hangs.
Right now I am running with a reduced kernel. I deleted the pcm and ata
drivers (system is now running off scsi only - Tekram 390U2W) and I also
alltogether removed softupdates from the kernel as well as anything else
that wasn't absolutely necessary.
In about 5-10 days I'll know wether this has helped.
If anyone has any further insights into this huge problem, I'd love to hear
about it!
Regards,
Dave.
--
Dave Boers < djb @ relativity . student . utwente . nl >
Physics graduate student && unix/BSD sysadmin - University of Twente
Public key: ftp://relativity.student.utwente.nl/pub/pgpkeys/djb.asc
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