Re: [Lse-tech] Re: efficient copy_to_user and copy_from_user routines in Linux Kernel

From: Mala Anand (
Date: Fri Jun 28 2002 - 06:55:54 EST

Niels wrote..
>Indeed, I ordered a P4 for these tests while still at IBM but AMD boxes
>not available to Mala, I believe. Before I got sacked, I even bought a P4
>to test this and other things at home but I lost interest in the matter so
>never actually got around to testing.

>When I did test back in February I created a few test programs and found
>that the code generated by GCC Version 3.x and the library that came with
>RedHat 6.2 gave almost as good results as the patches Mala then had
>available. Maybe it is time to see if the compiler has improved enough to
>scrap the copy code in the kernel in favor of code as generated by the

I need to check this out. I don't remember getting these results from you.
If you still have them, please mail me the results and the generated


   Mala Anand
   Linux Technology Center - Performance
   Phone:838-8088; Tie-line:678-8088

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