Re: [Fdutils] DMA cache consistency bug introduced in 2.6.28

[Pavel Machek]

> > > This might suggest that Mark's floppy controller doesn't like
> > > deep C? Mark, did you try booting with processor.max_cstate=1
> > > and HPET enabled?
> > 
> > We have indeed had historical issues with floppy and sleep states before. 
> 
> I removed that code when moving to 64bit (floppy driver disabling C1),
> but perhaps we need some variant of it again (but it's the first such
> report in many years). Although it would be sad to have it again on all 
> systems.

C1 is hlt. Are you sure? I could see how C3 could cause problems (DMA
 latency), but...

Can mark simply try with idle=poll?

									Pavel

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