Re: [Qemu-devel] arm mptimer implementation - why prescaler is multiply by 10?

[Peter Maydell]

On 27 October 2015 at 18:01, Peter Crosthwaite
<address@hidden> wrote:
> On Tue, Oct 27, 2015 at 7:19 AM, Dmitry Osipenko <address@hidden> wrote:
>> From my observation, Linux kernel is booting noticeably faster in the
>> emulated guest and host machine CPU usage is lower if we "artificially"
>> slowdown the MPtimer. You really shouldn't use it for the RTC, so doing that
>> trick shouldn't affect guest behavior.

> So I do wonder whether with your ptimer conversion this will be obsoleted,
> as the rate limiter there may do the work for us.

We still need to pick a nominal PERIPHCLK somehow, and that's
still a pretty arbitrary choice I think (and it doesn't
depend on the CPU speed itself: PERIPHCLK's period can be
any multiple of the main CPU CLK (minimum 2)).

thanks
-- PMM