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Subject: Re: [Lse-tech] Re: efficient copy_to_user and copy_from_user routines in
 Linux Kernel
To: "Niels Christiansen" <nc@ejna.ribald.com>
Cc: "Andrew Morton" <akpm@zip.com.au>,
       "Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
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From: "Mala Anand" <manand@us.ibm.com>
Date: Fri, 28 Jun 2002 06:55:54 -0500
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Niels wrote..
>Indeed, I ordered a P4 for these tests while still at IBM but AMD boxes
are
>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
>compiler.

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
code.





Regards,
    Mala


   Mala Anand
   E-mail:manand@us.ibm.com
   Linux Technology Center - Performance
   Phone:838-8088; Tie-line:678-8088



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