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Re: timer_resolution и swi4: clock sio
- To: nginx-ru@xxxxxxxxx
- Subject: Re: timer_resolution и swi4: clock sio
- From: Andrei Nigmatulin <andrei.nigmatulin@xxxxxxxxx>
- Date: Fri, 20 Mar 2009 19:25:35 +0300
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On Friday 20 March 2009 18:49, Kirill A. Korinskiy wrote:
> At Fri, 20 Mar 2009 18:23:36 +0300,
>
> Andrei Nigmatulin <andrei.nigmatulin@xxxxxxxxx> wrote:
> > А что, во FreeBSD gettimeofday() все еще syscall ?
>
> А где он нет? Как можно без cs получить доступ к rtc?
Как минимум в x86_64 linux.
Через tsc регистр (rdtsc или более удобная версия rdstcp на amd).
Если не ошибаюсь, на powerpc есть аналогичная функциональность.
--
Andrei Nigmatulin
GPG PUB KEY 6449830D
Now I lay me down to sleep(3)
Pray the OS my core to keep
If I die before I wake
Pray the Disk my core to take
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