Re: [patch] increase spinlock-debug looping timeouts (write_lock and NMI)

[Andrew Morton <akpm@osdl.org>]

On Wed, 21 Jun 2006 22:45:49 -0700 (PDT)
Dave Olson <olson@unixfolk.com> wrote:

> On Tue, 20 Jun 2006, Andrew Morton wrote:
> | > Intended to be more or less stock fc4 but with CONFIG_PCI_MSI=y and
> | > 2.6.17-based patch so the 8131 MSI quirk isn't enabled.
> | > 
> | > >From the config file:
> | > 	CONFIG_DEBUG_SPINLOCK=y
> | > 	CONFIG_DEBUG_SPINLOCK_SLEEP=y
> | 
> | OK, I goofed again.
> | 
> | It would be super-interesting to know whether CONFIG_DEBUG_SPINLOCK=n
> | improves things.
> 
> It does.   No stalls, hangs, or nmi's in several hours of running the
> test that previously failed on almost every run (with long stalls, system
> hangs, or NMI watchdogs), on the same hardware.
> 
> I made no other changes to the kernel config than turning both of
> the above off.
> 

Well isn't that interesting, thanks.   We have our 2.6.17.x patch.

Now we need to work out why.