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Date: Tue, 18 Jun 2013 12:37:33 +0400
From: Gleb Smirnoff <glebius@FreeBSD.org>
To: Andre Oppermann <andre@freebsd.org>
Subject: Re: svn commit: r251894 - in head: lib/libmemstat sys/vm
Message-ID: <20130618083733.GQ1400@FreeBSD.org>
References: <201306180450.r5I4oKoY091256@svn.freebsd.org>
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Cc: svn-src-head@freebsd.org, Jeff Roberson <jeff@FreeBSD.org>,
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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.

-- 
Totus tuus, Glebius.