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    SubjectRe: SYSENTER based syscalls patch, 2.1.105, RFC

    On Thu, 18 Jun 1998, Andrea Arcangeli wrote:

    > > [mingo@hal fastcall]$ ./fastcall
    > > (INT $0x80 based getpid(), got pid 497) latency:282 cycles
    > > (SYSENTER based getpid(), got pid 497) latency:138 cycles
    >
    > andrea@dragon:~$ ./a.out
    > (INT $0x80 based getpid(), got pid 949) latency:115 cycles
    > Illegal Instruction
    > [...]
    >
    > On my 266 Mhz P5MMX I am going faster than your PII?!?! I am using a #SMP
    > (no-SMP ;-) kernel but this should not change nothing since the test is
    > done outside the kernel code...

    yep. It's probably because on the PII it's more expensive to do
    segmentation related stuff. And call gates (int $0x80) do _alot_ of that
    stuff ...

    -- mingo


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