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SubjectRe: test10-pre1 problems on 4-way SuperServer8050
On Wed, 11 Oct 2000, Tigran Aivazian wrote:
> On Wed, 11 Oct 2000, Rik van Riel wrote:
> > On Wed, 11 Oct 2000, Tigran Aivazian wrote:
> > > On Wed, 11 Oct 2000, Mark Hemment wrote:
> > > > On Wed, 11 Oct 2000, Tigran Aivazian wrote:
> > > >
> > > > > a) one of the eepro100 interfaces (the onboard one on the S2QR6 mb) is
> > > > > malfunctioning, interrupts are generated but no traffic gets through (YES,
> > > > > I did plug it in correctly, this time, and I repeat 2.2.16 works!)
> > > >
> > > > I saw this the other week on our two-way Dell under a reasonibly heavy
> > > > load - but with 3c59x.c driver, the eepro100s survived!
> > > > Either NIC (had two Tornados) could go this away after anything from 1
> > > > to 36 hours of load. They would end up running in "poll" mode off the
> > > > transmit watchdog timer.
> > > > Swapped them for a dual-port eepro100 and no more problems.
> > >
> > > I disabled eepro100 support completely and the problem is still
> > > there. What I also noticed is that with highmem-PAE enabled I
> > > get BUG in page_alloc.c at line 221 so it is probably a VM
> > > problem recently introduced (hence cc'd Rik).
> >
> > Can you trigger this bug /without/ PAE ?
>
> no, I can't.

I wonder if PAE somehow messes with the locking semantics
of the page table things, because the test on line 221 of
page_alloc.c depends on the fact that locking works.

[in fact, that test is there exactly to verify that nothing
went wrong with the locking and we're not re-using a page
that's already in use]

Could you send me the backtrace of one of the cases where
you hit the bug ?

> > > I will continue to narrow down by removing some things (like
> > > mtrr) from the equation. Rik, the problem is that when one
> > > enables PAE (or just highmem-4G) support on a 4-way 6G RAM
> > > machine becomes 38-40 times slower.
> >
> > 38-40 times slower in what kind of benchmark ?
>
> compiling the kernel, specifically. But even a simple thing like
> "time ps" shows about 0.9 seconds real time when it should show
> something like 0.021 seconds. Everything becomes unbearably
> slow, make xconfig takes 4-5 minutes to startup, the shutdown
> becomes impossible so I do sysrq-B after a few syncs etc. Also,
> as I said, one of the eepro100 interfaces becomes dead. I
> believe this _is_ the same problem even if it really seems it is
> not.

OUCH ... this shouldn't happen and to be honest I don't
have an explanation for how this /could/ happen (or even
what it would have to do with the new VM)...

regards,

Rik
--
"What you're running that piece of shit Gnome?!?!"
-- Miguel de Icaza, UKUUG 2000

http://www.conectiva.com/ http://www.surriel.com/


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