Re: [00/41] Large Blocksize Support V7 (adds memmap support)

[JÃrn Engel]

On Mon, 17 September 2007 00:06:24 +0200, Goswin von Brederlow wrote:
> 
> How probable is it that the dentry is needed again? If you copy it and
> it is not needed then you wasted time. If you throw it out and it is
> needed then you wasted time too. Depending on the probability one of
> the two is cheaper overall. Idealy I would throw away dentries that
> haven't been accessed recently and copy recently used ones.
> 
> How much of a systems ram is spend on dentires? How much on task
> structures? Does anyone have some stats on that? If it is <10% of the
> total ram combined then I don't see much point in moving them. Just
> keep them out of the way of users memory so the buddy system can work
> effectively.

As usual, the answer is "it depends".  I've had up to 600MB in dentry
and inode slabs on a 1GiB machine after updatedb.  This machine
currently has 13MB in dentries, which seems to be reasonable for my
purposes.

JÃrn

-- 
Audacity augments courage; hesitation, fear.
-- Publilius Syrus
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