From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Daniel Vetter <daniel@ffwll.ch>
Cc: "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
dri-devel <dri-devel@lists.freedesktop.org>,
patchwork-lst@pengutronix.de,
"kernel@pengutronix.de" <kernel@pengutronix.de>,
Shawn Guo <shawnguo@kernel.org>
Subject: Re: [PATCH 02/12] drm/etnaviv: add devicetree bindings
Date: Sat, 5 Dec 2015 11:02:09 +0000 [thread overview]
Message-ID: <20151205110209.GG8644@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <20151205101208.GP10243@phenom.ffwll.local>
On Sat, Dec 05, 2015 at 11:12:08AM +0100, Daniel Vetter wrote:
> Given that I think the current etnaviv is a sound architecture. And I'm
> not saying that because drm requires everything to be smashed into one
> driver, since that's simple not the case.
There's other reasons as well, mostly from the performance point of view.
Having separate DRM devices for each GPU means you need to use dmabuf to
share buffers across the GPUs. This brings with it several kinds of
overhead:
1. having more fd usage in the client programs.
2. having more memory usage as a result.
3. having more locks, due to more object lists.
4. having the overhead from the DMA API when importing buffers between
different GPU nodes.
From my performance measurements over the last month, the top hit is
currently from the DMA API, so having to export and import buffers
between different GPU devices is just going to make that worse.
--
FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
according to speedtest.net.
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next prev parent reply other threads:[~2015-12-05 11:02 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-04 13:59 [PATCH 00/12] etnaviv DRM driver Lucas Stach
2015-12-04 13:59 ` [PATCH 03/12] drm/etnaviv: add etnaviv UAPI header Lucas Stach
[not found] ` <1449237604-19064-4-git-send-email-l.stach-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2015-12-04 14:24 ` Emil Velikov
2015-12-04 13:59 ` [PATCH 04/12] drm/etnaviv: add generated hardware description headers Lucas Stach
2015-12-04 13:59 ` [PATCH 05/12] drm/etnaviv: add GPU core driver Lucas Stach
2015-12-04 14:00 ` [PATCH 08/12] drm/etnaviv: add GPU MMU handling functionality Lucas Stach
[not found] ` <1449237604-19064-9-git-send-email-l.stach-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2015-12-04 14:59 ` Emil Velikov
[not found] ` <CACvgo50UW734S12xH=oszkNhgf53x5gbdeUxCdLZ0kGq1G=2Pg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-12-04 15:08 ` Lucas Stach
[not found] ` <1449237604-19064-1-git-send-email-l.stach-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2015-12-04 13:59 ` [PATCH 01/12] devicetree: add vendor prefix for Vivante Corporation Lucas Stach
[not found] ` <1449237604-19064-2-git-send-email-l.stach-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2015-12-04 16:23 ` Rob Herring
2015-12-04 13:59 ` [PATCH 02/12] drm/etnaviv: add devicetree bindings Lucas Stach
2015-12-04 16:29 ` Rob Herring
2015-12-04 16:41 ` Lucas Stach
2015-12-04 17:05 ` Russell King - ARM Linux
2015-12-04 17:33 ` Rob Herring
[not found] ` <CAL_JsqLcwk=h10zNvt1o=EKJZ58QvMyWnsTCNfkht-055X8Taw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-12-04 17:54 ` Russell King - ARM Linux
2015-12-04 17:56 ` Lucas Stach
[not found] ` <1449251760.8275.116.camel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2015-12-04 18:02 ` Jon Nettleton
2015-12-04 20:19 ` Rob Herring
2015-12-04 20:31 ` Russell King - ARM Linux
[not found] ` <20151204203101.GD8644-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2015-12-04 20:42 ` Ilia Mirkin
[not found] ` <CAKb7UviPhoiY-YP2aBHm0BHbeEjSF2wTguQScVXMBve-kZc16Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-12-04 22:05 ` Russell King - ARM Linux
2015-12-04 22:43 ` Ilia Mirkin
2015-12-05 10:12 ` Daniel Vetter
2015-12-05 11:02 ` Russell King - ARM Linux [this message]
2015-12-05 15:35 ` Daniel Vetter
2015-12-05 16:05 ` Russell King - ARM Linux
2015-12-07 8:41 ` Michel Dänzer
2015-12-08 9:12 ` Michel Dänzer
2015-12-08 13:15 ` Rob Herring
2015-12-04 20:43 ` Daniel Vetter
2015-12-05 11:26 ` Lucas Stach
[not found] ` <1449314779.2702.17.camel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2015-12-05 11:42 ` Russell King - ARM Linux
2015-12-05 23:22 ` Rob Herring
2015-12-05 12:17 ` Russell King - ARM Linux
2015-12-04 16:56 ` Russell King - ARM Linux
2015-12-04 13:59 ` [PATCH 06/12] drm/etnaviv: add GEM core functionality Lucas Stach
2015-12-04 13:59 ` [PATCH 07/12] drm/etnaviv: add GEM submit and cmdstream validation bits Lucas Stach
2015-12-04 14:00 ` [PATCH 09/12] drm/etnaviv: add GPU core dump functionality Lucas Stach
2015-12-04 14:00 ` [PATCH 11/12] MAINTAINERS: add Lucas Stach as maintainer for the etnaviv DRM driver Lucas Stach
2015-12-04 17:07 ` Russell King - ARM Linux
2015-12-04 17:08 ` Ilia Mirkin
[not found] ` <CAKb7Uvjh7B5ExWwRQNMhqDwTwPUsFKv4-jAszVp06qq2rGQFhg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-12-04 17:13 ` Russell King - ARM Linux
2015-12-04 17:17 ` Christian Gmeiner
[not found] ` <20151204171353.GA8644-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2015-12-04 17:18 ` Lucas Stach
[not found] ` <20151204170709.GY8644-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2015-12-04 17:26 ` Marc Kleine-Budde
2015-12-04 17:37 ` Russell King - ARM Linux
2015-12-05 15:17 ` Christian Gmeiner
2015-12-04 14:00 ` [PATCH 12/12] ARM: dts: imx6: add Vivante GPU nodes Lucas Stach
[not found] ` <1449237604-19064-13-git-send-email-l.stach-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2015-12-07 12:18 ` Russell King - ARM Linux
2015-12-07 12:18 ` Russell King - ARM Linux
2015-12-11 7:02 ` Shawn Guo
2015-12-14 9:52 ` Lucas Stach
[not found] ` <1450086745.3163.3.camel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2015-12-15 8:25 ` Shawn Guo
2015-12-15 10:18 ` Lucas Stach
2015-12-04 19:05 ` [PATCH 13/12] ARM: dts: dove: add DT GPU support Russell King
2015-12-04 19:05 ` Russell King
2015-12-04 19:48 ` [PATCH v2 " Russell King
2015-12-04 19:48 ` Russell King
[not found] ` <E1a4wLa-0004Vi-2t-eh5Bv4kxaXIANfyc6IWni62ZND6+EDdj@public.gmane.org>
2015-12-04 20:49 ` Andrew Lunn
2015-12-04 20:49 ` Andrew Lunn
[not found] ` <20151204204918.GB809-g2DYL2Zd6BY@public.gmane.org>
2015-12-04 22:07 ` Russell King - ARM Linux
2015-12-04 22:07 ` Russell King - ARM Linux
2015-12-04 19:48 ` [PATCH v2 14/12] ARM: dts: enable GPU for SolidRun's Cubox Russell King
2015-12-04 19:48 ` Russell King
2015-12-04 14:00 ` [PATCH 10/12] drm/etnaviv: add master driver and hook up in Kconfig and Makefile Lucas Stach
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