From mboxrd@z Thu Jan 1 00:00:00 1970 Subject: Re: [ofa-general] Re: Demand paging for memory regions References: <20080208234302.GH26564@sgi.com> <20080208155641.2258ad2c.akpm@linux-foundation.org> <20080209012446.GB7051@v2.random> <20080209015659.GC7051@v2.random> <20080209075556.63062452@bree.surriel.com> <47B2174E.5000708@opengridcomputing.com> From: Roland Dreier Date: Tue, 12 Feb 2008 14:41:48 -0800 In-Reply-To: (Christoph Lameter's message of "Tue, 12 Feb 2008 14:10:50 -0800 (PST)") Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: owner-linux-mm@kvack.org Return-Path: To: Christoph Lameter Cc: Steve Wise , Rik van Riel , Andrea Arcangeli , a.p.zijlstra@chello.nl, izike@qumranet.com, steiner@sgi.com, linux-kernel@vger.kernel.org, avi@qumranet.com, linux-mm@kvack.org, daniel.blueman@quadrics.com, Robin Holt , general@lists.openfabrics.org, Andrew Morton , kvm-devel@lists.sourceforge.net List-ID: > Not so far I guess but it could be equipped with these features right? I don't know anything about the T3 internals, but it's not clear that you could do this without a new chip design in general. Lot's of RDMA devices were designed expecting that when a packet arrives, the HW can look up the bus address for a given memory region/offset and place the packet immediately. It seems like a major change to be able to generate a "page fault" interrupt when a page isn't present, or even just wait to scatter some data until the host finishes updating page tables when the HW needs the translation. - R. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org