Messages in this thread |  | | Date | Wed, 17 Oct 2001 23:30:17 +0200 | From | Andrea Arcangeli <> | Subject | Re: Making diff(1) of linux kernels faster |
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On Wed, Oct 17, 2001 at 10:23:37PM +0100, chris@scary.beasts.org wrote: > > On Wed, 17 Oct 2001, Andrea Arcangeli wrote: > > > I think with directory readahead Marcelo meant a transparent kernel > > heuristic in the readdir path. ext2_get_page is completly synchronous > > and it's reading one page at time, that's bad but it can be improved > > transparently to userspace, just like we do with the files, and also > > like the old code was doing before the directory in pagecache IIRC. > > Do the -ac kernels have the directory in pagecache patch? If not, it could
yes, -ac has it too.
> explain why the -ac kernel performed _much_ better for the > creat()/stat()/unlink() tests in bonnie++.
It can't explain that. But there was another optimization in -ac that avoids restarting searching entries from the start of the directory. That could make a relevant difference. It is included in mainline too starting from 2.4.10.
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