Il 07/03/2014 18:20, Marcelo Tosatti ha scritto:
On Thu, Mar 06, 2014 at 06:33:58PM +0100, Jan Kiszka wrote:
> We cannot rely on the hardware-provided preemption timer support because
> we are holding L2 in HLT outside non-root mode.
> Furthermore, emulating
> the preemption will resolve tick rate errata on older Intel CPUs.
Can you describe this in more detail please? Errata number?
AAT59 and AAK139. Basically the rate of the preemption timer is wrong
and unpredictable.
http://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/xeon-5500-specification-update.pdf
http://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/core-mobile-spec-update.pdf
Paolo
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