Re: [PATCH v3 1/3] arch, x86, tsc deadline clockevent dev: reduce frequency roundoff error
From: Nicolai Stange
Date: Wed Jul 13 2016 - 10:32:42 EST
Paolo Bonzini <pbonzini@xxxxxxxxxx> writes:
> On 13/07/2016 15:49, Peter Zijlstra wrote:
>> On Wed, Jul 13, 2016 at 03:03:42PM +0200, Nicolai Stange wrote:
>>> + (u32)(((u64)tsc_khz * 1000) /
>>> + TSC_DIVISOR),
>>> 0xF, ~0UL);
>> div_u64() perhaps ?
> Or just squash together the two patches and do
> tsc_khz * (1000 / TSC_DIVISOR)
> because with TSC_DIVISOR equal to 2/4/8 there is no error from
> reassociating the operation.
Oh great, I didn't see this. Will resend.