On 6/18/13 4:37 AM, Gleb Smirnoff wrote:
On Tue, Jun 18, 2013 at 10:25:08AM +0200, Andre Oppermann wrote:
A> There used to be a problem with per CPU caches accumulating large amounts
A> of items without freeing back to the global (or socket) pool.
A>
A> Do these updates to UMA change this situation and/or do you have further
A> improvements coming up?
This is especially a problem with ZFS, which utilizes UMA extensively.
IMHO, we need a flag for uma_zcreate() that would disable per CPU caches, so
that certain zones (ZFS at least) would have them off.
It might be a good idea to force this flag on every zone that has allocation >=
then the page size.
What about people running with 256GB+ ram? Do they also want the per
cpu caches off?
--
Alfred Perlstein
VP Software Engineering, iXsystems
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