Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932311AbVJQQDJ (ORCPT ); Mon, 17 Oct 2005 12:03:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932313AbVJQQDI (ORCPT ); Mon, 17 Oct 2005 12:03:08 -0400 Received: from smtp.osdl.org ([65.172.181.4]:59337 "EHLO smtp.osdl.org") by vger.kernel.org with ESMTP id S932311AbVJQQDH (ORCPT ); Mon, 17 Oct 2005 12:03:07 -0400 Date: Mon, 17 Oct 2005 09:02:57 -0700 (PDT) From: Linus Torvalds To: Andi Kleen cc: Andrew Morton , Ravikiran G Thirumalai , linux-kernel@vger.kernel.org, discuss@x86-64.org, tglx@linutronix.de, shai@scalex86.org Subject: Re: x86_64: 2.6.14-rc4 swiotlb broken In-Reply-To: <200510171740.57614.ak@suse.de> Message-ID: References: <20051017093654.GA7652@localhost.localdomain> <200510171153.56063.ak@suse.de> <200510171740.57614.ak@suse.de> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 934 Lines: 30 On Mon, 17 Oct 2005, Andi Kleen wrote: > On Monday 17 October 2005 17:27, Linus Torvalds wrote: > > On Mon, 17 Oct 2005, Andi Kleen wrote: > > > The patch is actually not quite correct - in theory node 0 could be too > > > small to contain the full swiotlb bounce buffers. > > > > Is node 0 guaranteed to be all low-memory? What if it allocates stuff at > > the end of memory on NODE(0)? > > This is 64bit ... only low memory. Ehh.. No there isn't. PCI DMA isn't magically 64-bit, even on your Opteron. So low memory in this case is anything < 32 bits. How many bits the CPU has is immaterial. That's the whole _point_ of swtlb, after all, so I don't see why you argue. Linus - 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/