Messages in this thread | | | Date | Sun, 12 Nov 2006 16:45:40 -0500 | From | Dave Jones <> | Subject | Re: [Bugme-new] [Bug 7495] New: Kernel periodically hangs. |
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On Sun, Nov 12, 2006 at 03:16:38PM +0100, Arjan van de Ven wrote: > > > > We KNOW it can't work on a sizable amount of machines. This is why it > > > is a config option; you can enable it if YOUR machine is KNOWN to work, > > > and you get some gains. But it's also understood that it often it won't > > > work. So any sensible distro (since they have to aim for a wide > > > audience) disables this option ... > > > > Nowadays, many distributions only ship CONFIG_SMP=y kernels... > > that's a calculated risk on their side (and they know that); they're > balancing not functioning on a set of machines off against needing more > kernels.
Andi has a nice patch in the suse kernel which adds heuristics to disable apic on systems where it isn't likely to work. It DTRT in at least one problem case that I know of. The actual fall-out from enabling 'run SMP kernels on UP i686' for FC6 has mostly been a non-event. Literally a handful of cases, that will likely all get caught and worked around by Andi's patch or similar.
Dave
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