From: "Kevin Radloff" <radsaq@gmail.com>
To: "Alan Cox" <alan@lxorguk.ukuu.org.uk>
Cc: linux-kernel@vger.kernel.org
Subject: Re: PATCH: Fix broken PIO with libata
Date: Tue, 16 May 2006 13:19:11 -0400 [thread overview]
Message-ID: <3b0ffc1f0605161019j7149f72bv309db19eb9d12dd8@mail.gmail.com> (raw)
In-Reply-To: <1147794791.2151.71.camel@localhost.localdomain>
On 5/16/06, Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
> 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.
Hrm, as I recall that only started happening with ide-cs sometime in
the single digits of 2.6.x.. And note that it's only maxing out at
about 1.5MB/s. Should that saturate my laptop's 1.1GHz Pentium M
processor?
--
Kevin 'radsaq' Radloff
radsaq@gmail.com
http://thesaq.com/
next prev parent reply other threads:[~2006-05-16 17:19 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
2006-05-16 17:19 ` Kevin Radloff [this message]
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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