From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 23 Nov 2001 08:54:28 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 23 Nov 2001 08:54:18 -0500 Received: from elin.scali.no ([62.70.89.10]:5388 "EHLO elin.scali.no") by vger.kernel.org with ESMTP id ; Fri, 23 Nov 2001 08:54:05 -0500 Subject: Re: [Q] was the SYSENTER/SYSCALL fast system calls completed or discared in the end?? From: Terje Eggestad To: Andi Kleen Cc: linux-kernel In-Reply-To: In-Reply-To: <1006184327.19902.2.camel@pc-16.office.scali.no.suse.lists.linux.kernel> <20011121225402.A175@elf.ucw.cz.suse.lists.linux.kernel> <1006440069.22598.4.camel@pc-16.office.scali.no.suse.lists.linux.kernel> Content-Type: text/plain Content-Transfer-Encoding: 7bit X-Mailer: Evolution/0.99.2 (Preview Release) Date: 23 Nov 2001 14:54:02 +0100 Message-Id: <1006523642.25167.7.camel@pc-16.office.scali.no> Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Cool, do you happen top know where the patch is? On e that I can apply to stock 2.4.1x?? TJ tor, 2001-11-22 kl. 16:26 skrev Andi Kleen: > Terje Eggestad writes: > > > ons, 2001-11-21 kl. 22:54 skrev Pavel Machek: > > > > > > On Mon 19-11-01 16:38:45, Terje Eggestad wrote: > > > > subject says it all.... > > > > > > > > I remember there was a discussion and a patch floating around that > > > > implemented SYSCALL/SYSRET, just want to know what happened to it.... > > > > > > discarded > > > > Because there was no perf benefit or because the patch was in poor > > quality? > > The x86-64 port uses SYSCALL/SYSRET as the native call method for 64bit > programs. > > Before x86-64 it turned out that SYSCALL is not really usable because > of some builtin limitations (which are fixed in x86-64). This is only > a problem for the K6, K7 should have support for SYSENTER/SYSEXIT (the > Intel equivalent), which seems to be better designed. There is a patch > to use SYSENTER/SYSEXIT. > > > -Andi -- _________________________________________________________________________ Terje Eggestad terje.eggestad@scali.no Scali Scalable Linux Systems http://www.scali.com Olaf Helsets Vei 6 tel: +47 22 62 89 61 (OFFICE) P.O.Box 70 Bogerud +47 975 31 574 (MOBILE) N-0621 Oslo fax: +47 22 62 89 51 NORWAY _________________________________________________________________________