From owner-freebsd-arch  Thu Jan  3  3: 2:12 2002
Delivered-To: freebsd-arch@freebsd.org
Received: from mailman.zeta.org.au (mailman.zeta.org.au [203.26.10.16])
	by hub.freebsd.org (Postfix) with ESMTP
	id 9C10037B41C; Thu,  3 Jan 2002 03:02:08 -0800 (PST)
Received: from bde.zeta.org.au (bde.zeta.org.au [203.2.228.102])
	by mailman.zeta.org.au (8.9.3/8.8.7) with ESMTP id WAA30288;
	Thu, 3 Jan 2002 22:01:58 +1100
Date: Thu, 3 Jan 2002 23:13:23 +1100 (EST)
From: Bruce Evans <bde@zeta.org.au>
X-X-Sender:  <bde@gamplex.bde.org>
To: Peter Wemm <peter@wemm.org>
Cc: Matthew Dillon <dillon@apollo.backplane.com>,
	John Baldwin <jhb@FreeBSD.ORG>, <arch@FreeBSD.ORG>,
	Bernd Walter <ticso@cicely8.cicely.de>,
	Mike Smith <msmith@FreeBSD.ORG>, Michal Mertl <mime@traveller.cz>,
	Peter Jeremy <peter.jeremy@alcatel.com.au>
Subject: Re: When to use atomic_ functions? (was: 64 bit counters) 
In-Reply-To: <20020103102543.7737039EC@overcee.netplex.com.au>
Message-ID: <20020103224754.G16354-100000@gamplex.bde.org>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Sender: owner-freebsd-arch@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-arch.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo@FreeBSD.ORG?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo@FreeBSD.ORG?subject=subscribe%20freebsd-arch>
List-Unsubscribe: <mailto:majordomo@FreeBSD.ORG?subject=unsubscribe%20freebsd-arch>
X-Loop: FreeBSD.ORG

On Thu, 3 Jan 2002, Peter Wemm wrote:

> Incidently, probably 90%+ of freebsd boxes (all those that run GENERIC or
> similar) are essentially wire-oring the interrupt masks together due to the
> slip/ppp drivers in the kernel.  On most of them, splanything() pretty much
> masks all interrupts.  Check tty_imask, net_imask, and bio_imask and see
> for yourself (and check cambio/camnet as well).  We *almost* have a boolean

Er, I think someone named peter fixed this so that it only happens if
slip/ppp is actually used.  Only RELENG_3 still has the compile-time
wiring for slip.

> "interrupts on or off" state on most of these systems (not quite but
> almost).

Almost all except clock and fast interrupts.  This may be best (at
least for UP).  It's more efficient, and strict interrupt prioritisation
is rarely important.

Bruce


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-arch" in the body of the message