From: Stephen Warren <swarren@wwwdotorg.org>
To: Eric Anholt <eric@anholt.net>
Cc: linux-rpi-kernel@lists.infradead.org,
Russell King <linux@arm.linux.org.uk>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Lee Jones <lee@kernel.org>,
Florian Fainelli <f.fainelli@gmail.com>
Subject: Re: [PATCH 2/3] ARM: multi_v7_defconfig: Switch BCM2835 to sdhci-iproc.c for MMC
Date: Thu, 31 Mar 2016 20:01:59 -0600 [thread overview]
Message-ID: <56FDD697.2050901@wwwdotorg.org> (raw)
In-Reply-To: <1459470504-5007-2-git-send-email-eric@anholt.net>
On 03/31/2016 06:28 PM, Eric Anholt wrote:
> This approximately triples write performance for the SD card. My card
> is too full of important data to collect very reliable numbers, but I
> see 271.361% +/- 166.742% improvement (n=3 before, 6 after), for 'dd
> if=/dev/zero of=/boot/asdf bs=1M count=3 oflag=dsync,direct'. Read
> performance appears to be unaffected.
I thought that switching the defconfig wasn't possible, since this HW
module relies on the SoC core clock, and that can be asynchronously
changed by the FW running on the VideoCore. Consequently, this change
isn't safe unless the user puts non-default options in their config.txt.
The same comment applies to "[PATCH 1/4] ARM: bcm2835: Switch BCM2835 to
sdhci-iproc.c for MMC" in the other series.
next prev parent reply other threads:[~2016-04-01 2:02 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-01 0:28 [PATCH 1/3] ARM: multi_v7_defconfig: Add more BCM2835 support Eric Anholt
2016-04-01 0:28 ` [PATCH 2/3] ARM: multi_v7_defconfig: Switch BCM2835 to sdhci-iproc.c for MMC Eric Anholt
2016-04-01 2:01 ` Stephen Warren [this message]
2016-04-01 15:48 ` Eric Anholt
2016-04-01 16:58 ` Stephen Warren
2016-04-01 20:17 ` Stefan Wahren
2016-04-01 0:28 ` [PATCH 3/3] ARM: multi_v7_defconfig: Build in DWC2 USB support Eric Anholt
2016-04-01 2:04 ` [PATCH 1/3] ARM: multi_v7_defconfig: Add more BCM2835 support Stephen Warren
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=56FDD697.2050901@wwwdotorg.org \
--to=swarren@wwwdotorg.org \
--cc=eric@anholt.net \
--cc=f.fainelli@gmail.com \
--cc=lee@kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-rpi-kernel@lists.infradead.org \
--cc=linux@arm.linux.org.uk \
/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