Re: [Lse-tech] 7.52 second kernel compile

Theodore Tso
2002-03-18T06:44:13Z

On Sun, Mar 17, 2002 at 11:34:34PM +1100, Anton Blanchard wrote:
>
> > And this *without* the dcache_lock? Hmm. So you are saying there
> > may still be room for improvement?
>
> I tried the dcache lock patches but found it hard to see a difference,
> for us the mm stuff still seems to be the bottleneck.

Try the patch which gets rid of the BKL in ext2_get_block() --- if you
don't have that, let me know, I've got one kicking around that mostly
works except I haven't validated that it does the right thing if
quotas are enabled. If you're running with a cold page cache, I
suspect that will help out much more. If the numbers are assuming a
page-cache already preloaded with then getting rid of the BKL in
ext2_get_block() will help somewhat, but maybe not enough to be
significant.

- Ted