From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Morton Date: Wed, 04 Feb 2004 19:17:00 +0000 Subject: Re: [PATCH] turn off irqdebug by default on Altix Message-Id: <20040204111700.2cf6bc80.akpm@osdl.org> List-Id: References: <20040204152841.GB3387@localhost> In-Reply-To: <20040204152841.GB3387@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org Martin Hicks wrote: > > A while ago there was a discussion, started by Jack Steiner, about a hot > cache line in the irqdebug code that makes booting on large machines > very slow. The original thread can be found here: > > http://marc.theaimsgroup.com/?l=linux-kernel&m6858073229831&w=2 > > The end result was that it was felt that irqdebug sould remain on by > default on small machines, and that large machines should turn it off be > default if it was causing a problem. Yup. > Here is a patch that turns it off for sn2. It applies cleanly against > the linux-2.5 bk tree from this morning. I think it would be better to kill noirqdebug altogether, and to simply require irqdebug=N.