Messages in this thread | | | Subject | Re: [PATCH] zerocopy NFS for 2.5.36 | From | Alan Cox <> | Date | 19 Sep 2002 00:54:37 +0100 |
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On Thu, 2002-09-19 at 00:00, David S. Miller wrote: > It was discussed long ago that csum_and_copy_from_user() performs > better than plain copy_from_user() on x86. I do not remember all
The better was a freak of PPro/PII scheduling I think
> details, but I do know that using copy_from_user() is not a real > improvement at least on x86 architecture.
The same as bit is easy to explain. Its totally memory bandwidth limited on current x86-32 processors. (Although I'd welcome demonstrations to the contrary on newer toys)
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