From owner-freebsd-arch  Sun Feb  9  3:35:36 2003
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Date: Sun, 9 Feb 2003 06:35:05 -0500 (EST)
From: Jeff Roberson <jroberson@chesapeake.net>
To: phk@phk.freebsd.dk
Cc: Alfred Perlstein <bright@mu.org>, Peter Wemm <peter@wemm.org>,
	Jake Burkholder <jake@locore.ca>, <arch@FreeBSD.ORG>
Subject: Re: New kernel allocation API 
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On Sun, 9 Feb 2003 phk@phk.freebsd.dk wrote:

> In message <20030209085317.GP88781@elvis.mu.org>, Alfred Perlstein writes:
> >* phk@phk.freebsd.dk <phk@phk.freebsd.dk> [030209 00:31] wrote:
> >> In message <20030209075706.GO88781@elvis.mu.org>, Alfred Perlstein writes:
> >>
> >> >I may see if I can convert some paths in the kernel to use zones. :)
> >>
> >> I have a number of places where zones can be used instead of malloc,
> >> but since none of the places I have tried previously have resulted
> >> in measurable performance differences it has not been high on my
> >> agenda.
> >
> >Well, once converted to zones they could also be modded to take
> >advantage of the init/fini processing which _should_ make things
> >faster.  Also don't forget even if you don't see a perf improvement
> >you'll see siginifigant space savings if your size is not a power of
> >two or multiple of page size.
>
> I'm aware of all this, but I guess most of the objects I deal with
> don't really have enough trafic to come out measurable, probably
> because they don't contain mutexes.
>

I did pipes once when I originally did UMA.  The perf was measurable.  It
had carefully crafted init/fini ctor/dtor though.  Also, creds could
possibly benefit.

UMA mbufs would rule too. :-)

Cheers,
Jeff


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