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Date: Tue, 18 Jun 2013 08:03:03 -0400
From: Alfred Perlstein <bright@mu.org>
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To: Gleb Smirnoff <glebius@FreeBSD.org>
Subject: Re: svn commit: r251894 - in head: lib/libmemstat sys/vm
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Cc: svn-src-head@freebsd.org, Jeff Roberson <jeff@FreeBSD.org>,
 src-committers@freebsd.org, Andre Oppermann <andre@freebsd.org>,
 svn-src-all@freebsd.org
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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