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

[Mark Hounschell]

On 12/27/2009 06:09 AM, Pavel Machek wrote:
> 
>>>> 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
> 

The floppy still fails with idle=poll

Mark
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