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From: Roland Dreier <rdreier@cisco.com>
To: Christoph Lameter <clameter@sgi.com>
Cc: Steve Wise <swise@opengridcomputing.com>,
	Rik van Riel <riel@redhat.com>,
	Andrea Arcangeli <andrea@qumranet.com>,
	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 <holt@sgi.com>,
	general@lists.openfabrics.org,
	Andrew Morton <akpm@linux-foundation.org>,
	kvm-devel@lists.sourceforge.net
Subject: Re: [ofa-general] Re: Demand paging for memory regions
Date: Tue, 12 Feb 2008 14:41:48 -0800	[thread overview]
Message-ID: <adazlu5vlub.fsf@cisco.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0802121408150.9591@schroedinger.engr.sgi.com> (Christoph Lameter's message of "Tue, 12 Feb 2008 14:10:50 -0800 (PST)")

 > > 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.


  reply	other threads:[~2008-02-12 22:42 UTC|newest]

Thread overview: 81+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-08 22:06 [patch 0/6] MMU Notifiers V6 Christoph Lameter
2008-02-08 22:06 ` [patch 1/6] mmu_notifier: Core code Christoph Lameter
2008-02-08 22:06 ` [patch 2/6] mmu_notifier: Callbacks to invalidate address ranges Christoph Lameter
2008-02-08 22:06 ` [patch 3/6] mmu_notifier: invalidate_page callbacks Christoph Lameter
2008-02-08 22:06 ` [patch 4/6] mmu_notifier: Skeleton driver for a simple mmu_notifier Christoph Lameter
2008-02-08 22:06 ` [patch 5/6] mmu_notifier: Support for drivers with revers maps (f.e. for XPmem) Christoph Lameter
2008-02-08 22:06 ` [patch 6/6] mmu_rmap_notifier: Skeleton for complex driver that uses its own rmaps Christoph Lameter
2008-02-08 22:23 ` [patch 0/6] MMU Notifiers V6 Andrew Morton
2008-02-08 23:32   ` Christoph Lameter
2008-02-08 23:36     ` Robin Holt
2008-02-08 23:41       ` Christoph Lameter
2008-02-08 23:43         ` Robin Holt
2008-02-08 23:56           ` Andrew Morton
2008-02-09  0:05             ` Christoph Lameter
2008-02-09  0:12               ` [ofa-general] " Roland Dreier
2008-02-09  0:16                 ` Christoph Lameter
2008-02-09  0:22                   ` Roland Dreier
2008-02-09  0:36                     ` Christoph Lameter
2008-02-09  1:24                       ` Andrea Arcangeli
2008-02-09  1:27                         ` Christoph Lameter
2008-02-09  1:56                           ` Andrea Arcangeli
2008-02-09  2:16                             ` Christoph Lameter
2008-02-09 12:55                               ` Rik van Riel
2008-02-09 21:46                                 ` Christoph Lameter
2008-02-11 22:40                                   ` Demand paging for memory regions (was Re: MMU Notifiers V6) Roland Dreier
2008-02-12 22:01                                     ` Steve Wise
2008-02-12 22:10                                       ` Christoph Lameter
2008-02-12 22:41                                         ` Roland Dreier [this message]
2008-02-12 23:14                                           ` [ofa-general] Re: Demand paging for memory regions Felix Marti
2008-02-13  0:57                                             ` Christoph Lameter
2008-02-14 15:09                                             ` Steve Wise
2008-02-14 15:53                                               ` Robin Holt
2008-02-14 16:23                                                 ` Steve Wise
2008-02-14 17:48                                                   ` Caitlin Bestler
2008-02-14 19:39                                               ` Christoph Lameter
2008-02-14 20:17                                                 ` Caitlin Bestler
2008-02-14 20:20                                                   ` Christoph Lameter
2008-02-14 22:43                                                     ` Caitlin Bestler
2008-02-14 22:48                                                       ` Christoph Lameter
2008-02-15  1:26                                                         ` Caitlin Bestler
2008-02-15  2:37                                                           ` Christoph Lameter
2008-02-15 18:09                                                             ` Caitlin Bestler
2008-02-15 18:45                                                               ` Christoph Lameter
2008-02-15 18:53                                                                 ` Caitlin Bestler
2008-02-15 20:02                                                                   ` Christoph Lameter
2008-02-15 20:14                                                                     ` Caitlin Bestler
2008-02-15 22:50                                                                       ` Christoph Lameter
2008-02-15 23:50                                                                         ` Caitlin Bestler
2008-02-12 23:23                                           ` Jason Gunthorpe
2008-02-13  1:01                                             ` Christoph Lameter
2008-02-13  1:26                                               ` Jason Gunthorpe
2008-02-13  1:45                                                 ` Steve Wise
2008-02-13  2:35                                                 ` Christoph Lameter
2008-02-13  3:25                                                   ` Jason Gunthorpe
2008-02-13  3:56                                                     ` Patrick Geoffray
2008-02-13  4:26                                                       ` Jason Gunthorpe
2008-02-13  4:47                                                         ` Patrick Geoffray
2008-02-13 18:51                                                     ` Christoph Lameter
2008-02-13 19:51                                                       ` Jason Gunthorpe
2008-02-13 20:36                                                         ` Christoph Lameter
2008-02-13  4:09                                                   ` Christian Bell
2008-02-13 19:00                                                     ` Christoph Lameter
2008-02-13 19:46                                                       ` Christian Bell
2008-02-13 20:32                                                         ` Christoph Lameter
2008-02-13 22:44                                                           ` Kanoj Sarcar
2008-02-13 23:02                                                             ` Christoph Lameter
2008-02-13 23:43                                                               ` Kanoj Sarcar
2008-02-13 23:48                                                                 ` Jesse Barnes
2008-02-14  0:56                                                                 ` [ofa-general] " Andrea Arcangeli
2008-02-14 19:35                                                                 ` Christoph Lameter
2008-02-13 23:23                                                     ` Pete Wyckoff
2008-02-14  0:01                                                       ` Jason Gunthorpe
2008-02-27 22:11                                                         ` Christoph Lameter
2008-02-13  1:55                                               ` Christian Bell
2008-02-13  2:19                                                 ` Christoph Lameter
2008-02-13  0:56                                           ` Christoph Lameter
2008-02-13 12:11                                           ` Christoph Raisch
2008-02-13 19:02                                             ` Christoph Lameter
2008-02-09  0:12               ` [patch 0/6] MMU Notifiers V6 Andrew Morton
2008-02-09  0:18                 ` Christoph Lameter
2008-02-13 14:31 ` Jack Steiner

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