Messages in this thread | | | Subject | Re: [PATCH v3] x86/vdso: Handle clock_gettime(CLOCK_TAI) in vDSO | From | Florian Weimer <> | Date | Wed, 12 Sep 2018 15:01:43 +0200 |
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On 09/09/2018 10:05 PM, Thomas Gleixner wrote: > See the patch below. It's integrating TAI without slowing down everything > and it definitely does not result in indirect calls. > > On a HSW it slows down clock_gettime() by ~0.5ns. On a SKL I get a speedup > by ~0.5ns. On a AMD Epyc server it's 1.2ns speedup. So it somehow depends > on the uarch and I also observed compiler version dependend variations.
Does this mean glibc can keep using a single vDSO entrypoint, the one we have today?
Thanks, Florian
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