System load as crash factor with preemption???
Conrad J. Sabatier
conrads at cox.net
Wed Aug 4 09:56:55 PDT 2004
On 04-Aug-2004 Kenneth Stailey wrote:
> << Problems persist with crashes and hangs under heavy load,
> especially under SMP. The recent introduction of full-scale
> preemption exasperated the problem, though it has been mitigated by a
> recently committed hack. Speculation on the source of the problem
> seems to center around races in critical section and spinlock
> handling and nesting. This needs to be driven to root cause and
> fixed in order for 5.3 to be considered STABLE. >>
One thing I've been wondering about in all the postings I've seen re:
the preemption-related crashes: reference is made repeatedly to crashes
occurring under heavy load, yet my box (AMD Athlon 64, single-processor)
was crashing under practically no load at all.
With the no-preemption hack, the box has been quite stable, by the way.
Also, my other machine, an AMD Athlon (32-bit), single-processor,
running an i386 build, never experienced any crashes, yet it bears much
more load most of the time than the 64-bit box, as I use it as my
gateway, cvsup daemon, NFS server, etc, etc.
Just makes me question how much of a factor load really played in this
problem, and thought it might be worth mentioning.
Conrad J. Sabatier <conrads at cox.net> -- "In Unix veritas"
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