Re: Paravirt KVM capabilities

Ulrich Drepper
2007-01-10T18:00:59Z

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Ingo Molnar wrote:
> that alone is already ~100-200 cycles overhead, it essentially doubles
> the null syscall overhead. It matters at millions of syscalls per second
> workloads, 100 cycles overhead at 1 million syscalls a second means 5%
> performance difference at 2GHz.

Plus, x86-64 uses only syscall which doesn't have the opportunity to be
intercepted in ring 1, right? That's the much more important target
going forward.

--
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖

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