Messages in this thread | | | Date | Sat, 17 Apr 1999 03:11:45 +0200 | From | Jamie Lokier <> | Subject | Re: bad lmbench numbers for mmap |
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David Miller wrote: > 2) The freeing up of page tables at munmap > > I think #2 could be a possible culprit. > > 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.
Speaking of which. In principle, freeing page tables should make munmap() *faster*, because then you don't have to clear the page tables.
I note 2.2.6-pre3 isn't doing that.
-- Jamie
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