linux-kernel - Re: 2.6.24-rc4-mm1 and Very Slow PCMCIA Compact Flash

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Message-Id: <1197070744.15428.33.camel@localhost>
Date:	Fri, 07 Dec 2007 23:39:04 +0000
From:	Zan Lynx <zlynx@....org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-pcmcia@...ts.infradead.org,
	linux-ide@...r.kernel.org
Subject: Re: 2.6.24-rc4-mm1 and Very Slow PCMCIA Compact Flash


On Fri, 2007-12-07 at 15:22 -0800, Andrew Morton wrote:
> On Fri, 07 Dec 2007 23:09:43 +0000
> Zan Lynx <zlynx@....org> wrote:
> 
> > 
> > On Fri, 2007-12-07 at 15:02 -0800, Andrew Morton wrote:
> > > On Fri, 07 Dec 2007 20:38:24 +0000
> > > Zan Lynx <zlynx@....org> wrote:
> > > 
> > > > While I'm reporting problems I'll get this one out there.
> > > > 
> > > > I normally use a USB-2 memory card reader but I also have a PCMCIA
> > > > CompactFlash adapter that I use occasionally.  During the MM series
> > > > kernels 2.6.22 and 23 (I am pretty sure) this didn't work at all.  I
> > > > don't know about vanilla since I don't run that.
> > > > 
> > > > Now with MM kernels 2.6.24 rc1-4 the PCMCIA adapter works again, but I
> > > > only get read rates of 1.6 MB/s.  When it used to work in 2.6.20 I got
> > > > at least 16 MB/s.  The card itself is capable of 30+ in the USB-2
> > > > reader.
> > > >
> > 
[cut]
> Oh, OK.  Hopefully the ata guys can help out with this.
> 
> I don't know if it actually strictly a regression?  Did libata ever support
> that device in any earlier kernels?

That could be why it didn't work for a few kernel versions.  I
reconfigured for a libata-only system a while back.  And, since I
usually use the USB-2 flash reader I didn't care much about the PCMCIA.

I will try reverting that patch later tonight, in a few hours.
-- 
Zan Lynx <zlynx@....org>

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