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Date: Tue, 12 Feb 2008 14:41:48 -0800 From: Roland Dreier <rdreier@...co.com> To: Christoph Lameter <clameter@....com> Cc: Steve Wise <swise@...ngridcomputing.com>, Rik van Riel <riel@...hat.com>, Andrea Arcangeli <andrea@...ranet.com>, a.p.zijlstra@...llo.nl, izike@...ranet.com, steiner@....com, linux-kernel@...r.kernel.org, avi@...ranet.com, linux-mm@...ck.org, daniel.blueman@...drics.com, Robin Holt <holt@....com>, general@...ts.openfabrics.org, Andrew Morton <akpm@...ux-foundation.org>, kvm-devel@...ts.sourceforge.net Subject: Re: [ofa-general] Re: Demand paging for memory regions > > Chelsio's T3 HW doesn't support this. > 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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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