From: Gerd Hoffmann <kraxel@redhat.com>
To: Dave Airlie <airlied@gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
Linux Fbdev development list <linux-fbdev@vger.kernel.org>,
Teddy Wang <teddy.wang@siliconmotion.com>,
LKML <linux-kernel@vger.kernel.org>,
dri-devel <dri-devel@lists.freedesktop.org>,
Tomi Valkeinen <tomi.valkeinen@ti.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Sudip Mukherjee <sudipm.mukherjee@gmail.com>,
Arnaud Patard <arnaud.patard@rtp-net.org>
Subject: Re: [RFC PATCH 0/3] staging: remove fbdev drivers
Date: Tue, 13 Dec 2016 07:33:24 +0000 [thread overview]
Message-ID: <1481614404.27088.64.camel@redhat.com> (raw)
In-Reply-To: <CAPM=9twUSRvfmh2ENMXTwCx-ULGzmPpyHs_wMM0XGDeWHMhnXw@mail.gmail.com>
Hi,
> The acceleration that most of the 2D things provide isn't ever that
> great, and shadowing is a lot more effective if done properly.
That is probably true for anything pci-ish, because those devices are
optimized for memory writes and reads are horribly slow. So you surely
want avoid device memory reads and shadowing is a effective way to do
this.
On arm hardware the tradeoff may look quite different, the cpus are
relatively slow and I think most arm gpus don't have dedicated device
memory ...
cheers,
Gerd
WARNING: multiple messages have this Message-ID (diff)
From: Gerd Hoffmann <kraxel@redhat.com>
To: Dave Airlie <airlied@gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
Linux Fbdev development list <linux-fbdev@vger.kernel.org>,
Teddy Wang <teddy.wang@siliconmotion.com>,
LKML <linux-kernel@vger.kernel.org>,
dri-devel <dri-devel@lists.freedesktop.org>,
Tomi Valkeinen <tomi.valkeinen@ti.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Sudip Mukherjee <sudipm.mukherjee@gmail.com>,
Arnaud Patard <arnaud.patard@rtp-net.org>
Subject: Re: [RFC PATCH 0/3] staging: remove fbdev drivers
Date: Tue, 13 Dec 2016 08:33:24 +0100 [thread overview]
Message-ID: <1481614404.27088.64.camel@redhat.com> (raw)
In-Reply-To: <CAPM=9twUSRvfmh2ENMXTwCx-ULGzmPpyHs_wMM0XGDeWHMhnXw@mail.gmail.com>
Hi,
> The acceleration that most of the 2D things provide isn't ever that
> great, and shadowing is a lot more effective if done properly.
That is probably true for anything pci-ish, because those devices are
optimized for memory writes and reads are horribly slow. So you surely
want avoid device memory reads and shadowing is a effective way to do
this.
On arm hardware the tradeoff may look quite different, the cpus are
relatively slow and I think most arm gpus don't have dedicated device
memory ...
cheers,
Gerd
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
WARNING: multiple messages have this Message-ID (diff)
From: Gerd Hoffmann <kraxel@redhat.com>
To: Dave Airlie <airlied@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
Linux Fbdev development list <linux-fbdev@vger.kernel.org>,
Teddy Wang <teddy.wang@siliconmotion.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
LKML <linux-kernel@vger.kernel.org>,
dri-devel <dri-devel@lists.freedesktop.org>,
Tomi Valkeinen <tomi.valkeinen@ti.com>,
Sudip Mukherjee <sudipm.mukherjee@gmail.com>,
Arnaud Patard <arnaud.patard@rtp-net.org>
Subject: Re: [RFC PATCH 0/3] staging: remove fbdev drivers
Date: Tue, 13 Dec 2016 08:33:24 +0100 [thread overview]
Message-ID: <1481614404.27088.64.camel@redhat.com> (raw)
In-Reply-To: <CAPM=9twUSRvfmh2ENMXTwCx-ULGzmPpyHs_wMM0XGDeWHMhnXw@mail.gmail.com>
Hi,
> The acceleration that most of the 2D things provide isn't ever that
> great, and shadowing is a lot more effective if done properly.
That is probably true for anything pci-ish, because those devices are
optimized for memory writes and reads are horribly slow. So you surely
want avoid device memory reads and shadowing is a effective way to do
this.
On arm hardware the tradeoff may look quite different, the cpus are
relatively slow and I think most arm gpus don't have dedicated device
memory ...
cheers,
Gerd
next prev parent reply other threads:[~2016-12-13 7:33 UTC|newest]
Thread overview: 154+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-23 8:03 [RFC PATCH 0/3] staging: remove fbdev drivers Tomi Valkeinen
2016-11-23 8:03 ` Tomi Valkeinen
2016-11-23 8:03 ` Tomi Valkeinen
2016-11-23 8:03 ` [RFC PATCH 1/3] staging: remove xgifb Tomi Valkeinen
2016-11-23 8:03 ` Tomi Valkeinen
2016-11-23 8:03 ` Tomi Valkeinen
2016-11-23 8:03 ` [RFC PATCH 2/3] staging: remove sm750fb Tomi Valkeinen
2016-11-23 8:03 ` Tomi Valkeinen
2016-11-23 8:03 ` Tomi Valkeinen
2016-11-23 8:03 ` [RFC PATCH 3/3] staging: remove fbtft Tomi Valkeinen
2016-11-23 8:03 ` Tomi Valkeinen
2016-11-23 8:03 ` Tomi Valkeinen
2016-11-23 17:26 ` Noralf Trønnes
2016-11-23 17:26 ` Noralf Trønnes
2016-11-23 17:26 ` Noralf Trønnes
2016-11-24 8:36 ` Tomi Valkeinen
2016-11-24 8:36 ` Tomi Valkeinen
2016-11-24 8:36 ` Tomi Valkeinen
2016-11-23 20:12 ` Drew Fustini
2016-11-23 20:12 ` Drew Fustini
2016-11-23 8:19 ` [RFC PATCH 0/3] staging: remove fbdev drivers Daniel Vetter
2016-11-23 8:19 ` Daniel Vetter
2016-11-23 8:19 ` Daniel Vetter
2016-11-23 8:21 ` Tomi Valkeinen
2016-11-23 8:21 ` Tomi Valkeinen
2016-11-23 8:25 ` Geert Uytterhoeven
2016-11-23 8:25 ` Geert Uytterhoeven
2016-11-23 8:25 ` Geert Uytterhoeven
2016-11-23 8:45 ` Daniel Vetter
2016-11-23 8:45 ` Daniel Vetter
2016-11-23 8:45 ` Daniel Vetter
2016-11-23 8:52 ` Greg Kroah-Hartman
2016-11-23 8:52 ` Greg Kroah-Hartman
2016-11-23 8:52 ` Greg Kroah-Hartman
2016-11-23 9:12 ` Tomi Valkeinen
2016-11-23 9:12 ` Tomi Valkeinen
2016-11-23 9:12 ` Tomi Valkeinen
2016-11-23 9:49 ` Greg Kroah-Hartman
2016-11-23 9:49 ` Greg Kroah-Hartman
2016-11-23 9:49 ` Greg Kroah-Hartman
2016-11-23 10:05 ` Thomas Petazzoni
2016-11-23 10:05 ` Thomas Petazzoni
2016-12-22 20:36 ` Andy Shevchenko
2016-12-22 20:36 ` Andy Shevchenko
2016-12-22 20:36 ` Andy Shevchenko
2016-12-08 22:00 ` Sudip Mukherjee
2016-12-08 22:00 ` Sudip Mukherjee
2016-12-08 22:00 ` Sudip Mukherjee
2016-12-08 1:01 ` Benjamin Herrenschmidt
2016-12-08 1:01 ` Benjamin Herrenschmidt
2016-12-08 8:01 ` Tomi Valkeinen
2016-12-08 8:01 ` Tomi Valkeinen
2016-12-08 8:01 ` Tomi Valkeinen
2016-12-08 21:23 ` Benjamin Herrenschmidt
2016-12-08 21:23 ` Benjamin Herrenschmidt
2016-12-08 21:23 ` Benjamin Herrenschmidt
2016-12-08 21:43 ` Benjamin Herrenschmidt
2016-12-08 21:43 ` Benjamin Herrenschmidt
2016-12-08 21:43 ` Benjamin Herrenschmidt
2016-12-09 8:13 ` Daniel Vetter
2016-12-09 8:13 ` Daniel Vetter
2016-12-09 8:13 ` Daniel Vetter
2016-12-13 7:36 ` Gerd Hoffmann
2016-12-13 7:36 ` Gerd Hoffmann
2016-12-08 10:10 ` Daniel Vetter
2016-12-08 10:10 ` Daniel Vetter
2016-12-08 10:10 ` Daniel Vetter
2016-12-08 12:15 ` Geert Uytterhoeven
2016-12-08 12:15 ` Geert Uytterhoeven
2016-12-08 12:15 ` Geert Uytterhoeven
2016-12-08 14:02 ` Daniel Vetter
2016-12-08 14:02 ` Daniel Vetter
2016-12-08 14:02 ` Daniel Vetter
2016-12-08 14:22 ` Geert Uytterhoeven
2016-12-08 14:22 ` Geert Uytterhoeven
2016-12-08 14:37 ` Thomas Petazzoni
2016-12-08 14:37 ` Thomas Petazzoni
2016-12-08 14:44 ` Geert Uytterhoeven
2016-12-08 14:44 ` Geert Uytterhoeven
2016-12-08 14:44 ` Geert Uytterhoeven
2016-12-08 15:21 ` Daniel Vetter
2016-12-08 15:21 ` Daniel Vetter
2016-12-08 15:21 ` Daniel Vetter
2016-12-08 21:34 ` Benjamin Herrenschmidt
2016-12-08 21:34 ` Benjamin Herrenschmidt
2016-12-08 21:34 ` Benjamin Herrenschmidt
2016-12-08 21:57 ` Benjamin Herrenschmidt
2016-12-08 21:57 ` Benjamin Herrenschmidt
2016-12-08 21:57 ` Benjamin Herrenschmidt
2016-12-09 8:34 ` Daniel Vetter
2016-12-09 8:34 ` Daniel Vetter
2016-12-09 8:34 ` Daniel Vetter
2016-12-09 8:41 ` Daniel Vetter
2016-12-09 8:41 ` Daniel Vetter
2016-12-09 8:41 ` Daniel Vetter
2016-12-09 11:48 ` Benjamin Herrenschmidt
2016-12-09 11:48 ` Benjamin Herrenschmidt
2016-12-09 11:48 ` Benjamin Herrenschmidt
2016-12-09 13:35 ` Daniel Vetter
2016-12-09 13:35 ` Daniel Vetter
2016-12-09 13:35 ` Daniel Vetter
2016-12-09 20:27 ` Benjamin Herrenschmidt
2016-12-09 20:27 ` Benjamin Herrenschmidt
2016-12-09 20:27 ` Benjamin Herrenschmidt
2016-12-13 7:18 ` Michel Dänzer
2016-12-13 7:18 ` Michel Dänzer
2016-12-13 7:18 ` Michel Dänzer
2016-12-09 11:44 ` Benjamin Herrenschmidt
2016-12-09 11:44 ` Benjamin Herrenschmidt
2016-12-09 11:44 ` Benjamin Herrenschmidt
2016-12-09 12:33 ` Geert Uytterhoeven
2016-12-09 12:33 ` Geert Uytterhoeven
2016-12-09 12:33 ` Geert Uytterhoeven
2016-12-09 13:19 ` Lucas Stach
2016-12-09 13:19 ` Lucas Stach
2016-12-09 13:19 ` Lucas Stach
2016-12-09 13:33 ` Daniel Vetter
2016-12-09 13:33 ` Daniel Vetter
2016-12-09 13:33 ` Daniel Vetter
2016-12-09 13:57 ` David Herrmann
2016-12-09 13:57 ` David Herrmann
2016-12-09 13:57 ` David Herrmann
2016-12-09 14:04 ` Daniel Vetter
2016-12-09 14:04 ` Daniel Vetter
2016-12-09 14:04 ` Daniel Vetter
2016-12-09 20:29 ` Benjamin Herrenschmidt
2016-12-09 20:29 ` Benjamin Herrenschmidt
2016-12-09 20:29 ` Benjamin Herrenschmidt
2016-12-09 8:30 ` Daniel Vetter
2016-12-09 8:30 ` Daniel Vetter
2016-12-09 8:30 ` Daniel Vetter
2016-12-08 14:59 ` Jani Nikula
2016-12-08 14:59 ` Jani Nikula
2016-12-08 14:59 ` Jani Nikula
2016-12-08 14:22 ` Daniel Vetter
2016-12-08 14:22 ` Daniel Vetter
2016-12-08 14:22 ` Daniel Vetter
2016-12-08 21:28 ` Benjamin Herrenschmidt
2016-12-08 21:28 ` Benjamin Herrenschmidt
2016-12-08 21:28 ` Benjamin Herrenschmidt
2016-12-09 0:08 ` Dave Airlie
2016-12-09 0:08 ` Dave Airlie
2016-12-09 0:08 ` Dave Airlie
2016-12-09 8:04 ` Geert Uytterhoeven
2016-12-09 8:04 ` Geert Uytterhoeven
2016-12-09 11:40 ` Benjamin Herrenschmidt
2016-12-09 11:40 ` Benjamin Herrenschmidt
2016-12-09 11:40 ` Benjamin Herrenschmidt
2016-12-13 7:33 ` Gerd Hoffmann [this message]
2016-12-13 7:33 ` Gerd Hoffmann
2016-12-13 7:33 ` Gerd Hoffmann
2016-12-13 15:17 ` Laurent Pinchart
2016-12-13 15:17 ` Laurent Pinchart
2016-12-13 15:17 ` Laurent Pinchart
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1481614404.27088.64.camel@redhat.com \
--to=kraxel@redhat.com \
--cc=airlied@gmail.com \
--cc=arnaud.patard@rtp-net.org \
--cc=dri-devel@lists.freedesktop.org \
--cc=gregkh@linuxfoundation.org \
--cc=linux-fbdev@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=sudipm.mukherjee@gmail.com \
--cc=teddy.wang@siliconmotion.com \
--cc=thomas.petazzoni@free-electrons.com \
--cc=tomi.valkeinen@ti.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.