Messages in this thread | | | Date | Wed, 15 Dec 1999 12:39:08 +0100 | From | Artur Skawina <> | Subject | Re: [patch] fastcall-2.3.32-B6, SYSENTER/SYSEXIT support |
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Pavel Machek wrote: > > Well, read from cached file is _not_ meaningless, still Ingo seen > improvements on that.
it only matters if you use very small chunks (for 1 byte reads/writes a 20+% difference is not uncommon), but already at 4096 bytes the improvement is in the noise (while it may be measurable, i doubt you'd notice it in rl). Where the lower read/write cost is more likely to matter is ipc/sockets/pipes etc (when you either pass things around or write small elements, like headers).
> I think you should concentrate on read(), write() and select() > syscalls. Those are the ones done often.
it's not about often used syscalls; it's about speeding up _all_ of them. The only reason gettimeofday is singled out is because while you get a nice 31% improvement, you also get new infrastructure that lets you save another ~30%. [1] I can't think of other syscalls this is true for right now...
[1] 1st number is measured difference, 2nd is estimation.
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