From owner-freebsd-stable Wed Feb 27 17:23:31 2002 Delivered-To: freebsd-stable@freebsd.org Received: from star-one.liberator.dyndns.org (dsl-64-34-177-185.telocity.com [64.34.177.185]) by hub.freebsd.org (Postfix) with ESMTP id A150F37B41A for ; Wed, 27 Feb 2002 17:23:21 -0800 (PST) Received: (from dholmes@localhost) by star-one.liberator.dyndns.org (8.9.3/8.9.2) id RAA79623; Wed, 27 Feb 2002 17:23:20 -0800 (PST) (envelope-from dholmes) From: Dennis Holmes Message-Id: <200202280123.RAA79623@star-one.liberator.dyndns.org> Subject: Re: Pentium and NO_F00F_HACK = kernel panic In-Reply-To: <20020227213355.EAAC837B405@hub.freebsd.org> from Johann Frisch at "Feb 27, 2002 1:33:55 pm" To: jerfa@yahoo.com (Johann Frisch) Date: Wed, 27 Feb 2002 17:23:20 -0800 (PST) Cc: freebsd-stable@FreeBSD.ORG Reply-To: dholmes@rahul.net X-Mailer: ELM [version 2.4ME+ PL43 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Look what Johann Frisch wrote: > I just build a 4.5-STABLE kernel with "option NO_F00F_HACK" on a > Pentium 100 with the F00F bug (I thought I could save some bytes...). > This kernel paniced right after it printed the first two copyright > lines. Is this a bug or working as designed? > -- > MfG, > Johann If you have a Pentium with the bug, then you don't want this option. By doing this you've eliminated the code that makes you unsusceptible to the bug. (Stated another way for clarity, the "F00F hack" works around the CPU bug; the NO_F00F_HACK option disables the workaround.) +----------------+-------------------+------------------------------------+ | Dennis Holmes | dholmes@rahul.net | "We demand rigidly defined | | San Jose, CA +-------------------+ areas of doubt and uncertainty!" | +------=>{ Meanwhile, as Ford said: "Where are my potato chips?" }<=------+ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message