From: Patrick Geoffray <patrick@myri.com>
To: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Cc: Christoph Lameter <clameter@sgi.com>,
Roland Dreier <rdreier@cisco.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
general@lists.openfabrics.org
Subject: Re: [ofa-general] Re: Demand paging for memory regions
Date: Tue, 12 Feb 2008 23:47:22 -0500 [thread overview]
Message-ID: <47B2765A.2070901@myri.com> (raw)
In-Reply-To: <20080213042600.GA32449@obsidianresearch.com>
Jason Gunthorpe wrote:
> [mangled CC list trimmed]
Thanks, noticed that afterwards.
> This wasn't ment as a slight against Quadrics, only to point out that
> the specific wire protcols used by IB and iwarp are what cause this
> limitation, it would be easy to imagine that Quadrics has some
> additional twist that can make this easier..
The wire protocols are similar, nothing fancy. The specificity of
Quadrics (and many others) is that they can change the behavior of the
NIC in firmware, so they adapt to what the OS offers. They had the VM
notifier support in Tru64 back in the days, they just ported the
functionality to Linux.
> I ment that HPC users are unlikely to want to swap active RDMA pages
> if this causes a performance cost on normal operations. None of my
Swapping to disk is not a normal operations in HPC, it's going to be
slow anyway. The main problem for HPC users is not swapping, it's that
they do not know when a registered page is released to the OS through
free(), sbrk() or munmap(). Like swapping, they don't expect that it
will happen often, but they have to handle it gracefully.
Patrick
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Patrick Geoffray
Myricom, Inc.
http://www.myri.com
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next prev parent reply other threads:[~2008-02-13 4:47 UTC|newest]
Thread overview: 84+ 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 0:21 ` [ofa-general] trying to get of all lists R S
2008-02-09 0:22 ` [ofa-general] Re: [patch 0/6] MMU Notifiers V6 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 ` [ofa-general] Re: Demand paging for memory regions Roland Dreier
2008-02-12 23:14 ` 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 20:47 ` David Singleton
2008-02-15 9:55 ` Robin Holt
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 [this message]
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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