Re: bad lmbench numbers for mmap

Linus Torvalds (torvalds@transmeta.com)
17 Apr 1999 06:28:46 GMT

In article <199904162250.PAA19653@piglet.twiddle.net>,
David Miller <davem@twiddle.net> wrote:
>
>Linus, did you see any performance degration of lat_mmap when you
>added the free_pgtables() stuff into 2.2.x? I think such a problem
>would trigger if lat_mmap is doing large enough mmap's and they are in
>the right place.

No. See my other postings in this thread: I will bet that the page
table stuff has absolutely no impact at all, compared to the other stuff
we do.

I don't see that this problem should be anything new. Have we ever been
any good at lat_mmap? I don't think so..

Linus

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