Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 28 Aug 2002 12:12:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 28 Aug 2002 12:12:21 -0400 Received: from ppp-217-133-221-76.dialup.tiscali.it ([217.133.221.76]:21405 "EHLO home.ldb.ods.org") by vger.kernel.org with ESMTP id ; Wed, 28 Aug 2002 12:12:16 -0400 Subject: Re: [PATCH 1 / ...] i386 dynamic fixup/self modifying code From: Luca Barbieri To: Mikael Pettersson Cc: Linux-Kernel ML , Linus Torvalds In-Reply-To: <15724.61927.221405.274843@kim.it.uu.se> References: <1030506106.1489.27.camel@ldb> <15724.61927.221405.274843@kim.it.uu.se> Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-ec5sNgfm9qlkownYNeeB" X-Mailer: Ximian Evolution 1.0.5 Date: 28 Aug 2002 18:16:30 +0200 Message-Id: <1030551390.1489.63.camel@ldb> Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1456 Lines: 39 --=-ec5sNgfm9qlkownYNeeB Content-Type: text/plain Content-Transfer-Encoding: 7bit > I've tried this sort of thing before (unsynchronised cross-modifying code), > but I had to abandon it due to Pentium III Erratum E49 and similar errata > for all Intel P6 CPUs. Have you verified that you're not hitting this erratum? It is indeed completely hitting it. However, we can work around this by simply stopping all other CPUs in interrupt context with an IPI (while this may sound horrible, it shouldn't significantly impact performance unless the response time is excessively long). I'll write some code to this. However I don't have the hardware to test it, so it might require multiple iterations to get it right. As for the "all Intel P6 CPUs" are really _all_ Intel P6 CPU broken? Do you know of any other CPU that would need the workaround? --=-ec5sNgfm9qlkownYNeeB Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.7 (GNU/Linux) iD8DBQA9bPdedjkty3ft5+cRAskXAJ9wPmv57EmeMfie+txqpneM7drXnwCgqK2F sedMXPTrO+MyHsZHosspBkA= =T9OB -----END PGP SIGNATURE----- --=-ec5sNgfm9qlkownYNeeB-- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/