Re: Differences between FreeBSD and Linux system call mechanism

MOLNAR Ingo (mingo@chiara.csoma.elte.hu)
Thu, 3 Sep 1998 23:04:05 +0200 (CEST)


On Thu, 3 Sep 1998, Richard B. Johnson wrote:

> There is work being done on a new "SysCall" method. Time will
> tell if it is really faster. [...]

?? I have posted a patch a few weeks ago that implements SYSENTER/SYSLEAVE
based system call support, and have posted detailed (cycles accuracy)
timings too. (and sample code that does a getpid() based on the new system
entry point)

> My guess is that it will be 6 of one-kind and 1/2 dozen of another.

no need to guess, null syscall latency is twice as fast on a PII with
SYSENTER, 150 cycles vs. 300+ cycles with INT.

-- mingo

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