From: Pierre Ossman <drzeus-list@drzeus.cx>
To: LKML <linux-kernel@vger.kernel.org>,
Russell King <rmk+lkml@arm.linux.org.uk>
Subject: MMC performance
Date: Mon, 11 Oct 2004 13:05:09 +0200 [thread overview]
Message-ID: <416A68E5.6080608@drzeus.cx> (raw)
I've added SGIO support to my driver now hoping that it would resolve
the piss-poor performance I've been getting. Didn't do much difference
though.
Read operations are fairly fast. It queues 8kB at a time. A bit small
perhaps, but still decent.
Writing, however, only sends a single sector at a time. The queue
process eats up half of the CPU time on my machine during a write. And
since MMC cards have to clear a whole bunch of sectors before a write
shouldn't you send as many sectors as possible to them?
Since I don't have another controller to compare with I don't really
know if the problem is in my code, the MMC layer, the block layer or the
filesystem.
I'm going to dig around a bit more but some pointers are welcome. At
least which layer I should be looking at.
Rgds
Pierre
next reply other threads:[~2004-10-11 11:05 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-11 11:05 Pierre Ossman [this message]
2004-10-11 12:19 ` MMC performance Russell King
2004-10-11 13:18 ` Alan Cox
2004-10-11 15:27 ` Pierre Ossman
2004-10-11 18:01 ` Pierre Ossman
2004-10-18 19:26 ` Pierre Ossman
2004-10-11 13:49 ` Pierre Ossman
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