Messages in this thread |  | | From | (Robert Krawitz) | Subject | Re: MMX performance.... | Date | 6 Feb 1997 23:10:40 GMT |
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In article <Pine.LNX.3.95.970206204244.3277A-100000@ferret.lmh.ox.ac.uk> Chris Evans <chris@ferret.lmh.ox.ac.uk> writes:
On 6 Feb 1997, Robert Krawitz wrote:
> The Pentium memcpy() patch, BTW, has a lot of overhead of its own; it > dumps and restores the FPU state (when it's in use it dumps the > registers; when not, it dumps just the rest of the state). That's why > it's configured to operate only when the amount of data to be copied > is large. The overhead is well worth it, though, since memory > bandwidth on write is used so much more efficiently.
Is the Pentium memcpy patch in 2.1.x yet? If not, why not? Such a low level change should go into the development kernels as early as possible, surely...
I've been sending it off to Linus periodically. He hasn't responded. I would like to see it in the kernel.
Actually it's about time I started using development kernels on my personal box. I like to always run with the memcpy patch though. Is there at least a 2.1.x patch for it?
Please see my web page http://www.tiac.net/users/rlk/linux.html. -- Robert Krawitz <rlk@tiac.net> http://www.tiac.net/users/rlk/
Member of the League for Programming Freedom -- mail lpf@uunet.uu.net Tall Clubs International -- http://www.tall.org/ or 1-800-521-2512
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