linux-kernel - Re: Extremely slow IO with a PCMCIA CompactFlash adapter

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Date:	Sat, 1 Aug 2009 17:52:18 +0200
From:	Andreas Mohr <andi@...as.de>
To:	Jack Byer <ojbyer@....net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Extremely slow IO with a PCMCIA CompactFlash adapter

Hi,

> Is this expected behavior? Is there any setup I am missing that would make this faster?

No, certainly not, I don't remember it to be this slow (it's been a
while since I last tried though, still have hardware here).
Possibly it's a DMA misdetection problem (keeps trying to use DMA
despite it not being possible) which is common with CF type setups.
Try fiddling with hdparm or blktool DMA-related or I/O setup settings.
Other things would include libata.dma=0 (or other values!) for libata
layer or ide-core.nodma= boot parameter (for IDE layer).

And if this indeed is the problem, then it would be very useful to
get automatic handling implemented properly.

Andreas Mohr
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