From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] mmc: mxs-mmc: add support for pre_req and post_req
Date: Thu, 28 Apr 2011 11:10:22 +0100 [thread overview]
Message-ID: <20110428101022.GA17290@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <BANLkTikq2mu=rNiRuRPjikkpXuH6DKOsFA@mail.gmail.com>
On Thu, Apr 28, 2011 at 09:52:17AM +0200, Per Forlin wrote:
> I wanted to test the performance without cache penalty but removing
> dma_map_sg may not work since it produces the physical mapped sg list.
> This is not as simple as I first thought. Make a copy for dma_map_sg
> (call it dma_map_sg_no_cache) and modify it to not clean/inc the
> cache. Replace dma_map_sg with dma_map_sg_no_cache in the mxs-mmc
> driver.
> Removing dma_unmap should be ok for this test case.
> Do you still get very low numbers?
We can live in the hope that this is gathering evidence to illustrate
why having DMA incoherent caches are bad news for performance, and that
one day ARM Ltd will one day give us proper DMA cache coherency for all
devices.
next prev parent reply other threads:[~2011-04-28 10:10 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-06 19:07 [PATCH v2 00/12] mmc: use nonblock mmc requests to minimize latency Per Forlin
2011-04-06 19:07 ` [PATCH v2 01/12] mmc: add none blocking mmc request function Per Forlin
2011-04-15 10:34 ` David Vrabel
2011-04-20 7:17 ` Per Forlin
2011-04-26 13:29 ` David Vrabel
2011-04-26 14:22 ` Per Forlin
2011-04-06 19:07 ` [PATCH v2 02/12] mmc: mmc_test: add debugfs file to list all tests Per Forlin
2011-04-06 19:07 ` [PATCH v2 03/12] mmc: mmc_test: add test for none blocking transfers Per Forlin
2011-04-17 7:09 ` Lin Tony-B19295
2011-04-20 7:30 ` Per Forlin
2011-04-17 15:46 ` Shawn Guo
2011-04-20 7:41 ` Per Forlin
2011-04-06 19:07 ` [PATCH v2 04/12] mmc: add member in mmc queue struct to hold request data Per Forlin
2011-04-06 19:07 ` [PATCH v2 05/12] mmc: add a block request prepare function Per Forlin
2011-04-06 19:07 ` [PATCH v2 06/12] mmc: move error code in mmc_block_issue_rw_rq to a separate function Per Forlin
2011-04-06 19:07 ` [PATCH v2 07/12] mmc: add a second mmc queue request member Per Forlin
2011-04-06 19:07 ` [PATCH v2 08/12] mmc: add handling for two parallel block requests in issue_rw_rq Per Forlin
2011-04-20 11:32 ` Per Forlin
2011-04-06 19:07 ` [PATCH v2 09/12] mmc: test: add random fault injection in core.c Per Forlin
2011-04-06 19:07 ` [PATCH v2 10/12] omap_hsmmc: use original sg_len for dma_unmap_sg Per Forlin
2011-04-06 19:07 ` [PATCH v2 11/12] omap_hsmmc: add support for pre_req and post_req Per Forlin
2011-04-06 19:07 ` [PATCH v2 12/12] mmci: implement pre_req() and post_req() Per Forlin
2011-04-08 16:49 ` [PATCH v2 00/12] mmc: use nonblock mmc requests to minimize latency Linus Walleij
2011-04-09 11:55 ` Jae hoon Chung
2011-04-10 3:33 ` anish singh
2011-04-11 9:03 ` Per Forlin
2011-04-11 9:07 ` Sachin Nikam
2011-04-11 9:08 ` Per Forlin
2011-04-19 14:30 ` Jae hoon Chung
2011-04-16 15:48 ` Shawn Guo
2011-04-20 8:19 ` Per Forlin
2011-04-16 16:48 ` [PATCH] mmc: sdhci: add support for pre_req and post_req Shawn Guo
2011-04-16 23:06 ` Andrei Warkentin
2011-04-22 11:01 ` Jaehoon Chung
2011-04-27 0:59 ` Andrei Warkentin
2011-04-26 1:26 ` Jaehoon Chung
2011-04-26 2:47 ` Shawn Guo
2011-04-26 10:21 ` Per Forlin
2011-04-17 16:33 ` [PATCH] mmc: mxs-mmc: " Shawn Guo
2011-04-17 16:48 ` Shawn Guo
2011-04-20 8:01 ` Per Forlin
2011-04-20 14:01 ` Shawn Guo
2011-04-20 15:22 ` Per Forlin
2011-04-21 6:25 ` Shawn Guo
2011-04-21 8:52 ` Per Forlin
2011-04-20 15:30 ` Per Forlin
2011-04-21 6:29 ` Shawn Guo
2011-04-21 8:46 ` Per Forlin
2011-04-21 9:11 ` Shawn Guo
2011-04-21 9:47 ` Per Forlin
2011-04-21 10:15 ` Per Forlin
2011-04-28 7:52 ` Per Forlin
2011-04-28 10:10 ` Russell King - ARM Linux [this message]
2011-04-20 7:58 ` Per Forlin
2011-04-20 8:17 ` Shawn Guo
2011-04-20 13:51 ` [PATCH v2] " Shawn Guo
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=20110428101022.GA17290@n2100.arm.linux.org.uk \
--to=linux@arm.linux.org.uk \
--cc=linux-arm-kernel@lists.infradead.org \
/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).