linux/drivers/mmc/card
Luca Porzio d3df0465db mmc: remove bondage between REQ_META and reliable write
Anytime a write operation is performed with Reliable Write flag enabled,
the eMMC device is enforced to bypass the cache and do a write to the
underling NVM device by Jedec specification; this causes a performance
penalty since write operations can't be optimized by the device cache.

In our tests, we replayed a typical mobile daily trace pattern and found
~9% overall time reduction in trace replay by using this patch. Also the
write ops within 4KB~64KB chunk size range get a 40~60% performance
improvement by using the patch (as this range of write chunks are the ones
affected by REQ_META).

This patch has been discussed in the Mobile & Embedded Linux Storage Forum
and it's the results of feedbacks from many people. We also checked with
fsdevl and f2fs mailing list developers that this change in the usage of
REQ_META is not affecting FS behavior and we got positive feedbacks.
Reporting here the feedbacks:
http://comments.gmane.org/gmane.linux.file-systems/97219
http://thread.gmane.org/gmane.linux.file-systems.f2fs/3178/focus=3183

Signed-off-by: Bruce Ford <bford@micron.com>
Signed-off-by: Luca Porzio <lporzio@micron.com>
Fixes: ce39f9d17c ("mmc: support packed write command for eMMC4.5 devices")
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-11-09 14:04:52 +01:00
..
block.c mmc: remove bondage between REQ_META and reliable write 2015-11-09 14:04:52 +01:00
Kconfig tty: Added a CONFIG_TTY option to allow removal of TTY 2013-01-18 16:15:27 -08:00
Makefile mmc: Makefile: Fix EXTRA_CFLAGS assignment 2010-10-23 21:11:15 +08:00
mmc_test.c mmc: core: Fix init_card in 52Mhz 2015-10-21 10:18:11 +02:00
queue.c scatterlist: remove open coded sg_unmark_end instances 2015-08-17 08:12:56 -06:00
queue.h mmc: block: Retry errored data requests when re-tuning is needed 2015-06-01 09:06:59 +02:00
sdio_uart.c mmc: Convert pr_warning to pr_warn 2014-09-24 10:13:09 +02:00