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Re: Proposed F13 feature: drop separate updates repository



On Wed, 2 Dec 2009, Bruno Wolff III wrote:

> On Wed, Dec 02, 2009 at 17:58:24 -0500,
>   Seth Vidal <skvidal fedoraproject org> wrote:
> >
> > I tested it on our backend to be sure. getting the complete pkglist
> > goes from taking 5 minutes to take 30s.
> >
> > yes, I said 5 minutes.
>
> Have you tried any of the tunning knobs to have the directory cache be
> alotted more space or given higher priority? For example:
>
> vfs_cache_pressure
> ------------------
>
> Controls the tendency of the kernel to reclaim the memory which is used for
> caching of directory and inode objects.
>
> At the default value of vfs_cache_pressure=100 the kernel will attempt to
> reclaim dentries and inodes at a "fair" rate with respect to pagecache and
> swapcache reclaim.  Decreasing vfs_cache_pressure causes the kernel to prefer
> to retain dentry and inode caches.  Increasing vfs_cache_pressure beyond 100
> causes the kernel to prefer to reclaim dentries and inodes.
>

We have experimented with this for the purposes of rsync on our mirrors
but haven't experimented for this specific issue.

	-Mike


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