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    SubjectRe: [uml-devel] SYSCALL, ptrace and syscall restart breakages (Re: [RFC] weird crap with vdso on uml/i386)
    On 08/23/2011 01:56 PM, Borislav Petkov wrote:
    >
    > But no, I don't think the difference has disappeared - to the contrary,
    > AFAICT, the intention is for SYSCALL to be the fastest way to do
    > syscalls on x86 due to diminished number of segment checks etc. INT80
    > is legacy, slower, etc. I believe Andy measured a similar situation on
    > Sandy Bridge with SYSCALL having latencies in the tens of nsecs range
    > and INT80 being much slower. Ingo also measured a similar situation
    > where the latency gap between the two on Intel is even bigger.
    >

    Sandy Bridge doesn't have SYSCALL32 at all. It has SYSENTER and SYSCALL64.

    -hpa


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