From: Pavel Machek <pavel@ucw.cz>
To: Marek Vasut <marek.vasut@gmail.com>,
kernel list <linux-kernel@vger.kernel.org>,
dinh.linux@gmail.com
Cc: plagnioj@jcrosoft.com, tomi.valkeinen@ti.com,
grant.likely@linaro.org, robh+dt@kernel.org, jg1.han@samsung.com,
robdclark@gmail.com, geert@linux-m68k.org,
linux-fbdev@vger.kernel.org, devicetree@vger.kernel.org
Subject: simple framebuffer slower by factor of 20, on socfpga (arm) platform
Date: Tue, 07 Apr 2015 12:12:47 +0000 [thread overview]
Message-ID: <20150407121247.GA29497@amd> (raw)
Hi!
I have an socfpga board, which uses has simple framebuffer implemented
in the FPGA. On 3.15, framebuffer is fast:
root@wagabuibui:~# time cat /dev/fb0 > /dev/null
real 0m 0.00s
user 0m 0.00s
sys 0m 0.00s
on 3.18, this takes 220msec. Similar slowdown exists for
writes. Simple framebuffer did not change at all between 3.15 and
3.18; resource flags of the framebuffer are still same (0x200).
If I enable caching on 3.18, it speeds up a bit, to 70msec or
so... Which means problem is not only in caching.
Any ideas?
Best regards,
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next reply other threads:[~2015-04-07 12:12 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-07 12:12 Pavel Machek [this message]
2015-04-07 12:19 ` simple framebuffer slower by factor of 20, on socfpga (arm) platform Geert Uytterhoeven
2015-04-07 14:24 ` Marek Vasut
2015-04-09 11:06 ` Pavel Machek
2015-04-09 11:21 ` Tomi Valkeinen
2015-04-09 11:34 ` Tomi Valkeinen
[not found] ` <552663C2.70308-l0cyMroinI0@public.gmane.org>
2015-04-09 19:51 ` Arnd Bergmann
2015-04-24 13:31 ` Pavel Machek
2015-04-10 7:17 ` Archit Taneja
2015-04-24 13:29 ` Pavel Machek
2015-04-24 13:40 ` Tomi Valkeinen
2015-04-24 13:46 ` Geert Uytterhoeven
2015-04-26 19:31 ` Pavel Machek
2015-04-28 13:48 ` Russell King - ARM Linux
[not found] ` <20150428134848.GC12732-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2015-04-28 15:28 ` Nicolas Pitre
2015-05-06 10:45 ` Russell King - ARM Linux
2015-05-06 20:32 ` Nicolas Pitre
2015-05-12 8:52 ` Pavel Machek
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=20150407121247.GA29497@amd \
--to=pavel@ucw.cz \
--cc=devicetree@vger.kernel.org \
--cc=dinh.linux@gmail.com \
--cc=geert@linux-m68k.org \
--cc=grant.likely@linaro.org \
--cc=jg1.han@samsung.com \
--cc=linux-fbdev@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=marek.vasut@gmail.com \
--cc=plagnioj@jcrosoft.com \
--cc=robdclark@gmail.com \
--cc=robh+dt@kernel.org \
--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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).