2.6.24-rc4-mm1 and Very Slow PCMCIA Compact Flash

[Zan Lynx]

On Fri, 2007-12-07 at 15:02 -0800, Andrew Morton wrote:
> On Fri, 07 Dec 2007 20:38:24 +0000
> Zan Lynx <zlynx at 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.
> >

> Are we talking about this?
[cut]
> > It might be that it auto-configures for PIO-0.  I have no idea why it
> > does that.
> > 
> > Another interesting thing is that doing a dd to or from the card brings
> > the rest of the system to a nearly complete halt.  Interrupt problem?
> 
> Where are you seeing the evidence that it autoconfigures for PIO-0?

No, this:
pccard: PCMCIA card inserted into slot 0
cs: memory probe 0x50000000-0x57ffffff: excluding 0x50000000-0x57ffffff
cs: memory probe 0xe0100000-0xe17fffff: excluding 0xe0100000-0xe026ffff 0xe03e0000-0xe082ffff 0xe0b10000-0xe10cffff
pcmcia: registering new device pcmcia0.0
scsi2 : pata_pcmcia
ata3: PATA max PIO0 cmd 0x3100 ctl 0x310e irq 19
ata3.00: CFA: LEXAR ATA FLASH, V2.00, max PIO6
ata3.00: 8018640 sectors, multi 0: LBA 
ata3.00: configured for PIO0
ata3.00: configured for PIO0
ata3: EH complete
isa bounce pool size: 16 pages
scsi 2:0:0:0: Direct-Access     ATA      LEXAR ATA FLASH  V2.0 PQ: 0 ANSI: 5
sd 2:0:0:0: [sdb] 8018640 512-byte hardware sectors (4106 MB)
sd 2:0:0:0: [sdb] Write Protect is off
sd 2:0:0:0: [sdb] Mode Sense: 00 3a 00 00
sd 2:0:0:0: [sdb] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
sd 2:0:0:0: [sdb] 8018640 512-byte hardware sectors (4106 MB)
sd 2:0:0:0: [sdb] Write Protect is off
sd 2:0:0:0: [sdb] Mode Sense: 00 3a 00 00
sd 2:0:0:0: [sdb] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA sdb: sdb1
sd 2:0:0:0: [sdb] Attached SCSI removable disk

Specifically:
ata3.00: configured for PIO0
ata3.00: configured for PIO0
-- 
Zan Lynx <zlynx at acm.org>
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