From owner-freebsd-hackers  Mon Oct  8  9:32:18 2001
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Date: Mon, 8 Oct 2001 09:32:10 -0700
From: Brooks Davis <brooks@one-eyed-alien.net>
To: Bsdguru@aol.com
Cc: hackers@FreeBSD.ORG
Subject: Re: splx() overhead.
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In-Reply-To: <16e.20f7124.28f3296e@aol.com>; from Bsdguru@aol.com on Mon, Oct 08, 2001 at 12:08:14PM -0400
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On Mon, Oct 08, 2001 at 12:08:14PM -0400, Bsdguru@aol.com wrote:
> In doing some kernel profiling analysis it seems that splx is taking up b=
ig=20
> chunks of time.
>=20
> The mbuf macros call splimp()..splx() explicitly..are they required at=20
> interrupt time? Is there a higher performance way of protecting the neces=
sary=20
> code?

Yes and yes.  spl macros are now no-ops in current and are being
replaced by locks which protect data structures.

-- Brooks

--=20
Any statement of the form "X is the one, true Y" is FALSE.
PGP fingerprint 655D 519C 26A7 82E7 2529  9BF0 5D8E 8BE9 F238 1AD4

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