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

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Message-Id: <1197169375.7352.4.camel@localhost>
Date:	Sat, 08 Dec 2007 20:02:54 -0700
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, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Jeff Garzik <jeff@...zik.org>
Subject: Re: 2.6.24-rc4-mm1 and Very Slow PCMCIA Compact Flash


On Sat, 2007-12-08 at 02:07 -0800, Andrew Morton wrote:
> On Fri, 07 Dec 2007 22:01:33 -0700 Zan Lynx <zlynx@....org> wrote:
> 
> > 
> > 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:
> > [cut] 
> > > > > > 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]
> argh.  OK.  And Linus's current tree is OK, yes?
> 
> In which case we should be OK for 2.6.24 and I guess we can hope like heck
> that the dud patch doesn't leak into mainline.  Hopefully Alan will get
> some time to look into it before 2.6.25 opens.

Linus' tree is also broken.

I tried a Linus 2.6.24-rc4 and it acts the same way, with a very slow
transfer rate.  

I also tried 2.6.24-rc4 with the older not-libata PATA drivers and it is
broken.  dmesg had a line about the CF card detected as hda,
but /sys/block did not have hda and /dev/hda did not function.

I will try the patches you mentioned, but I think I may also have to
work backward through kernel versions until I find the last one where
the PCMCIA hd{a,b,c,d,e} drivers worked.
-- 
Zan Lynx <zlynx@....org>

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