On Thu, 21 May 2015, Adrian Hunter wrote:
> If it takes longer than 12us to read the PIT counter lsb/msb,
> then the error margin will never fall below 500ppm within 50ms,
> and Fast TSC calibration will always fail.
So finally the legacy PIT emulation takes longer than the 30 years old
hardware implementation. Progress!
> This patch detects when that will happen and switches to using
> a slightly different algorithm that takes advantage of the PIT's
> latch comand.
Is there really no smarter way to figure out the TSC frequency on
modern systems?
Thanks,
tglx
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
