Messages in this thread | | | Subject | Re: [Q] was the SYSENTER/SYSCALL fast system calls completed or discared in the end?? | From | Andi Kleen <> | Date | 22 Nov 2001 16:26:15 +0100 |
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Terje Eggestad <terje.eggestad@scali.no> writes:
> ons, 2001-11-21 kl. 22:54 skrev Pavel Machek: > > > > On Mon 19-11-01 16:38:45, Terje Eggestad wrote: > > > subject says it all.... > > > > > > I remember there was a discussion and a patch floating around that > > > implemented SYSCALL/SYSRET, just want to know what happened to it.... > > > > discarded > > Because there was no perf benefit or because the patch was in poor > quality?
The x86-64 port uses SYSCALL/SYSRET as the native call method for 64bit programs.
Before x86-64 it turned out that SYSCALL is not really usable because of some builtin limitations (which are fixed in x86-64). This is only a problem for the K6, K7 should have support for SYSENTER/SYSEXIT (the Intel equivalent), which seems to be better designed. There is a patch to use SYSENTER/SYSEXIT.
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