Re: [PATCH 1/3] powernow-k6: disable cache when changing frequency

[Viresh Kumar]

On 12 December 2013 06:08, Mikulas Patocka <mpatocka@xxxxxxxxxx> wrote:
> During frequency transition the processor is in "EPM Stop Grant" state.
> The documentation says that the processor doesn't respond to inquiry
> requests in this state. Consequently, coherency of processor caches and
> bus master devices is not maintained, causing the system instability.
>
> This patch flushes the cache during frequency transition. It fixes the
> instability.

I don't have much idea of these systems but wouldn't this affect performance
badly?
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