From: David Laight <David.Laight@ACULAB.COM>
To: 'David Miller' <davem@davemloft.net>,
"ttoukan.linux@gmail.com" <ttoukan.linux@gmail.com>
Cc: "edumazet@google.com" <edumazet@google.com>,
"brouer@redhat.com" <brouer@redhat.com>,
"alexander.duyck@gmail.com" <alexander.duyck@gmail.com>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"tariqt@mellanox.com" <tariqt@mellanox.com>,
"kafai@fb.com" <kafai@fb.com>,
"saeedm@mellanox.com" <saeedm@mellanox.com>,
"willemb@google.com" <willemb@google.com>,
"bblanco@plumgrid.com" <bblanco@plumgrid.com>,
"ast@kernel.org" <ast@kernel.org>,
"eric.dumazet@gmail.com" <eric.dumazet@gmail.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: RE: [PATCH v3 net-next 08/14] mlx4: use order-0 pages for RX
Date: Tue, 14 Feb 2017 17:17:22 +0000 [thread overview]
Message-ID: <063D6719AE5E284EB5DD2968C1650D6DCFE63512@AcuExch.aculab.com> (raw)
In-Reply-To: <20170214.120426.2032015522492111544.davem@davemloft.net>
From: David Miller
> Sent: 14 February 2017 17:04
...
> One path I see around all of this is full integration. Meaning that
> we can free pages into the page allocator which are still DMA mapped.
> And future allocations from that device are prioritized to take still
> DMA mapped objects.
...
For systems with 'expensive' iommu has anyone tried separating the
allocation of iommu resource (eg page table slots) from their
assignment to physical pages?
Provided the page sizes all match, setting up a receive buffer might
be as simple as writing the physical address into the iommu slot
that matches the ring entry.
Or am I thinking about hardware that is much simpler than real life?
David
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next prev parent reply other threads:[~2017-02-14 17:17 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20170213195858.5215-1-edumazet@google.com>
[not found] ` <20170213195858.5215-9-edumazet@google.com>
[not found] ` <CAKgT0Ufx0Y=9kjLax36Gx4e7Y-A7sKZDNYxgJ9wbCT4_vxHhGA@mail.gmail.com>
[not found] ` <CANn89iLkPB_Dx1L2dFfwOoeXOmPhu_C3OO2yqZi8+Rvjr=-EtA@mail.gmail.com>
[not found] ` <CAKgT0UeB_e_Z7LM1_r=en8JJdgLhoYFstWpCDQN6iawLYZJKDA@mail.gmail.com>
2017-02-14 12:12 ` Jesper Dangaard Brouer
2017-02-14 13:45 ` Eric Dumazet
2017-02-14 14:12 ` Eric Dumazet
2017-02-14 14:56 ` Tariq Toukan
2017-02-14 15:51 ` Eric Dumazet
2017-02-14 16:03 ` Eric Dumazet
2017-02-14 17:29 ` Tom Herbert
2017-02-15 16:42 ` Tariq Toukan
2017-02-15 16:57 ` Eric Dumazet
2017-02-16 13:08 ` Tariq Toukan
2017-02-16 15:47 ` Eric Dumazet
2017-02-16 17:05 ` Tom Herbert
2017-02-16 17:11 ` Eric Dumazet
2017-02-16 20:49 ` Saeed Mahameed
2017-02-16 19:03 ` David Miller
2017-02-16 21:06 ` Saeed Mahameed
2017-02-14 17:04 ` David Miller
2017-02-14 17:17 ` David Laight [this message]
2017-02-14 17:22 ` David Miller
2017-02-14 19:38 ` Jesper Dangaard Brouer
2017-02-14 19:59 ` David Miller
2017-02-14 17:29 ` Alexander Duyck
2017-02-14 18:46 ` Jesper Dangaard Brouer
2017-02-14 19:02 ` Eric Dumazet
2017-02-14 20:02 ` Jesper Dangaard Brouer
2017-02-14 21:56 ` Eric Dumazet
2017-02-14 19:06 ` Alexander Duyck
2017-02-14 19:50 ` Jesper Dangaard Brouer
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