From owner-freebsd-hackers Thu May 20 12:24:47 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from herring.nlsystems.com (nlsys.demon.co.uk [158.152.125.33]) by hub.freebsd.org (Postfix) with ESMTP id F0C5A15476 for ; Thu, 20 May 1999 12:24:35 -0700 (PDT) (envelope-from dfr@nlsystems.com) Received: from localhost (dfr@localhost) by herring.nlsystems.com (8.9.3/8.8.8) with ESMTP id UAA24600; Thu, 20 May 1999 20:25:45 +0100 (BST) (envelope-from dfr@nlsystems.com) Date: Thu, 20 May 1999 20:25:45 +0100 (BST) From: Doug Rabson To: Peter Wemm Cc: Tommy Hallgren , freebsd-hackers@freebsd.org Subject: Re: Lazy SPLs In-Reply-To: <19990520114148.9EF951F5A@spinner.netplex.com.au> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Thu, 20 May 1999, Peter Wemm wrote: > Tommy Hallgren wrote: > > Hi! > > > > I'm reading http://www.BSDI.COM/products/internet/40-qna.mhtml#Q5 and found t > he > > following peice of text: > > > > "Lazy SPLs - The kernel no longer masks hardware events unless a hardware eve > nt > > actually occurs, avoiding many expensive operations." > > > > Does anyone know what this is? > > Exactly what it says.. We've been doing it for as long as I can remember, > at least as far back as 2.0.5, probably as far back as 1.x. My earliest memory of it was as "Bruce's new interrupt code" for 386bsd. It was part of the 386bsd patchkit I think. -- Doug Rabson Mail: dfr@nlsystems.com Nonlinear Systems Ltd. Phone: +44 181 442 9037 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message