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From: Sam Leffler <sam@errno.com>
Organization: Errno Consulting
To: freebsd-hackers@freebsd.org
Date: Fri, 4 Jun 2004 11:59:02 -0700
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cc: Gleb Smirnoff <glebius@cell.sick.ru>
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cc: Bosko Milekic <bmilekic@freebsd.org>
Subject: Re: [HEADS-UP] mbuma is in the tree
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On Friday 04 June 2004 04:27 am, Gleb Smirnoff wrote:
> On Thu, Jun 03, 2004 at 08:19:11AM -0700, Brooks Davis wrote:
> B> > On Wed, Jun 02, 2004 at 10:56:52AM -0700, Sam Leffler wrote:
> B> > S> allocated using this mechanism.  I did it once for vlan tags but
> botched it B> > S> (didn't handle module references properly) so backed it.
> But there's no B> > S> reason someone cannot redo it or convert other
> heavily used fixed size tags B> > S> to use a zone.
> B> >
> B> > Have you saved your efforts? May I look at them?
> B>
> B> They are in the CVS history of sys/net/if_vlan.c.
>
> I see now, thanks.
>
> Question to Sam: have you performed any tests? Is this definitely
> true, that UMAllocing in special zone is faster than general malloc()?

Allocating from a zone was noticeable for gige interfaces, especially on my 
SMP configuration (which was running w/o Giant).  For non-gige interfaces the 
overhead of using malloc is not noticeable (as I reported when I first 
converted vlan handling over to use tags).  Regardless the point was that you 
can already use a zone for tags if you want.

	Sam