From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Kevin Radloff <radsaq@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: PATCH: Fix broken PIO with libata
Date: Tue, 16 May 2006 16:53:11 +0100 [thread overview]
Message-ID: <1147794791.2151.71.camel@localhost.localdomain> (raw)
In-Reply-To: <3b0ffc1f0605160833k5f6355c5n3f2a9ab1b211a95@mail.gmail.com>
On Maw, 2006-05-16 at 11:33 -0400, Kevin Radloff wrote:
> However, I still have a problem with pata_pcmcia (that I actually
> experienced also with the ide-cs driver) where sustained reading or
> writing to the CF card spikes the CPU with nearly 100% system time.
That is normal. The PCMCIA devices don't support DMA. As a result of
this the processor has to fetch each byte itself over the ISA speed
PCMCIA bus link.
Alan
next prev parent reply other threads:[~2006-05-16 15:40 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-16 14:39 Alan Cox
2006-05-16 15:33 ` Kevin Radloff
2006-05-16 15:53 ` Alan Cox [this message]
2006-05-16 17:19 ` Kevin Radloff
2006-05-16 17:27 ` Jeff Garzik
2006-05-16 17:39 ` Tejun Heo
2006-05-16 18:13 ` Kevin Radloff
2006-05-16 22:51 ` Alan Cox
2006-05-16 15:36 ` Tejun Heo
2006-05-16 15:48 ` Jeff Garzik
2006-05-16 15:57 ` Tejun Heo
2006-05-16 23:00 ` Paul Mackerras
2006-05-16 17:10 ` Jeff Garzik
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