From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Mon, 21 Aug 2006 16:26:42 +0100 (BST) Received: from localhost.localdomain ([127.0.0.1]:35048 "EHLO bacchus.dhis.org") by ftp.linux-mips.org with ESMTP id S20037562AbWHUP0k (ORCPT ); Mon, 21 Aug 2006 16:26:40 +0100 Received: from denk.linux-mips.net (denk.linux-mips.net [127.0.0.1]) by bacchus.dhis.org (8.13.7/8.13.4) with ESMTP id k7LFQv1L020156; Mon, 21 Aug 2006 16:26:57 +0100 Received: (from ralf@localhost) by denk.linux-mips.net (8.13.7/8.13.7/Submit) id k7LFQv1J020155; Mon, 21 Aug 2006 16:26:57 +0100 Date: Mon, 21 Aug 2006 16:26:57 +0100 From: Ralf Baechle To: "Maciej W. Rozycki" Cc: Atsushi Nemoto , linux-mips@linux-mips.org Subject: Re: [PATCH] qemu does not have dcache aliases Message-ID: <20060821152657.GB19600@linux-mips.org> References: <20060820.003338.25478178.anemo@mba.ocn.ne.jp> <20060821.225910.108307053.anemo@mba.ocn.ne.jp> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.1i Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-archive-position: 12385 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: ralf@linux-mips.org Precedence: bulk X-list: linux-mips On Mon, Aug 21, 2006 at 04:16:21PM +0100, Maciej W. Rozycki wrote: > > Well, the QEMU cpu has 2-way 2kB dcache... does not have aliasing > > anyway. :-) > > I don't think emulating a bigger cache so that we can add aliases should > be *that* difficult. Adding aliases themselves might be a bit trickier, > but the gain would certainly justify the hassle, wouldn't it? The cache lookup for every access would have serious impact on performance. The question is, is it worth the price? Would such patches be acceptable by the upstream qemu maintainers? Ralf