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Groups > linux.kernel > #1442479
| From | Paolo Bonzini <pbonzini@redhat.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v3 1/3] arch, x86, tsc deadline clockevent dev: reduce frequency roundoff error |
| Date | 2016-07-13 16:00 +0200 |
| Message-ID | <rUsRH-3OH-21@gated-at.bofh.it> (permalink) |
| References | <rUs5k-3uO-3@gated-at.bofh.it> <rUs5k-3uO-1@gated-at.bofh.it> <rUsRH-3OH-13@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On 13/07/2016 15:49, Peter Zijlstra wrote: > On Wed, Jul 13, 2016 at 03:03:42PM +0200, Nicolai Stange wrote: > >> clockevents_config_and_register(levt, >> + (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. Paolo
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[PATCH v3 1/3] arch, x86, tsc deadline clockevent dev: reduce frequency roundoff error Nicolai Stange <nicstange@gmail.com> - 2016-07-13 15:10 +0200
Re: [PATCH v3 1/3] arch, x86, tsc deadline clockevent dev: reduce frequency roundoff error Peter Zijlstra <peterz@infradead.org> - 2016-07-13 16:00 +0200
Re: [PATCH v3 1/3] arch, x86, tsc deadline clockevent dev: reduce frequency roundoff error Paolo Bonzini <pbonzini@redhat.com> - 2016-07-13 16:00 +0200
Re: [PATCH v3 1/3] arch, x86, tsc deadline clockevent dev: reduce frequency roundoff error Nicolai Stange <nicstange@gmail.com> - 2016-07-13 16:40 +0200
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