Re: Patch nag: Bug #363400

On Wed, 2007-03-28 at 21:27 +0200, Alexander Larsson wrote:
> On Wed, 2007-03-28 at 12:52 -0600, Hans Petter Jansson wrote:

> > I basically arrived at the value based on what would be acceptable
> > fadvise() CPU overhead (<1%) for the XFS runs that were posted.
> > 
> > Will you accept the patch if I just set DROP_CACHE_BATCH_SIZE to 20MB?
> > It would preserve the lower fadvise() limit and cause cache "pollution"
> > of up to 20MB during the operation.

> I think its better to have two values for this. Even if we later change
> the 20 meg value i think its valuable to differentiate these two
> settings, as they are really two different things (one is batching to
> avoid many fadvice calls, one is some attempt to guess when caches can
> be safely dropped).

Ok. I've attached a revised patch to the bug at:

Hans Petter

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