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

Zan Lynx
2007-12-07T23:39:17Z

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On Fri, 2007-12-07 at 15:22 -0800, Andrew Morton wrote:
> On Fri, 07 Dec 2007 23:09:43 +0000
> Zan Lynx <zlynx@acm.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@acm.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.