Re: Extremely slow IO with a PCMCIA CompactFlash adapter

[Robert Hancock]

On 08/01/2009 04:44 PM, Jack Byer wrote:
> > Can you post the dmesg output from detecting the device?
>
> I was originally getting this error:
>
> irq 3: nobody cared (try booting with the "irqpoll" option)
> Pid: 23488, comm: modprobe Not tainted 2.6.31-rc4 #2
> Call Trace:
> [<c104e3f4>] ? __report_bad_irq+0x24/0x90
> [<c104e5b7>] ? note_interrupt+0x157/0x1a0
> [<c104edcb>] ? handle_level_irq+0xbb/0x100
> [<c1004ec7>] ? handle_irq+0x17/0x20
> [<c100490a>] ? do_IRQ+0x3a/0xb0
> [<c1003329>] ? common_interrupt+0x29/0x30
> [<c10284b5>] ? __do_softirq+0x35/0xf0
> [<c104d4ed>] ? handle_IRQ_event+0x2d/0xc0
> [<c102859d>] ? do_softirq+0x2d/0x40
> [<c102874d>] ? irq_exit+0x5d/0x80
> [<c1004913>] ? do_IRQ+0x43/0xb0
> [<c1003329>] ? common_interrupt+0x29/0x30
> [<c104dc0a>] ? __setup_irq+0x17a/0x2c0
> [<f80fa7f0>] ? ata_sff_interrupt+0x0/0xf0 [libata]
> [<c104de11>] ? request_threaded_irq+0xc1/0x100
> [<c104f2c4>] ? devm_request_threaded_irq+0x34/0xa0
> [<f80fa7f0>] ? ata_sff_interrupt+0x0/0xf0 [libata]
> [<c104f2ee>] ? devm_request_threaded_irq+0x5e/0xa0
> [<f80e9c3f>] ? ata_host_activate+0x8f/0x110 [libata]
> [<f80fa7f0>] ? ata_sff_interrupt+0x0/0xf0 [libata]
> [<f99a6466>] ? pcmcia_init_one+0x2c6/0x340 [pata_pcmcia]
> [<c10c8e81>] ? sysfs_find_dirent+0x21/0x30
> [<f8359a26>] ? pcmcia_device_probe+0xf6/0x1b0 [pcmcia]
> [<c10c9fa1>] ? sysfs_do_create_link+0xa1/0x140
> [<c1155b24>] ? driver_probe_device+0x74/0x180
> [<f835a0eb>] ? pcmcia_bus_match+0x1bb/0x4a0 [pcmcia]
> [<c1155cb1>] ? __driver_attach+0x81/0x90
> [<f83597b0>] ? pcmcia_device_remove+0x0/0x140 [pcmcia]
> [<c1155474>] ? bus_for_each_dev+0x54/0x80
> [<f83597b0>] ? pcmcia_device_remove+0x0/0x140 [pcmcia]
> [<c11559c6>] ? driver_attach+0x16/0x20
> [<c1155c30>] ? __driver_attach+0x0/0x90
> [<c1154d06>] ? bus_add_driver+0xb6/0x250
> [<f83597b0>] ? pcmcia_device_remove+0x0/0x140 [pcmcia]
> [<c1155f27>] ? driver_register+0x67/0x150
> [<f835ab51>] ? pcmcia_register_driver+0x91/0x110 [pcmcia]
> [<f99ab000>] ? pcmcia_init+0x0/0xa [pata_pcmcia]
> [<c100102a>] ? _stext+0x2a/0x160
> [<c104b3c3>] ? sys_init_module+0xb3/0x1f0
> [<c1081ca1>] ? sys_read+0x41/0x80
> [<c1002cf4>] ? sysenter_do_call+0x12/0x26
> handlers:
> [<f80fa7f0>] (ata_sff_interrupt+0x0/0xf0 [libata])
> Disabling IRQ #3
>
> Now I rebooted with irqpoll and everything looks good in dmesg:
>
> yenta_cardbus 0000:00:0a.0: CardBus bridge found [103c:0024]
> yenta_cardbus 0000:00:0a.0: O2: res at 0x94/0xD4: 00/ea
> yenta_cardbus 0000:00:0a.0: O2: enabling read prefetch/write burst
> yenta_cardbus 0000:00:0a.0: ISA IRQ mask 0x00b8, PCI irq 11
> yenta_cardbus 0000:00:0a.0: Socket status: 30000007 pcmcia_socket
> pcmcia_socket0: cs: IO port probe 0x100-0x3af: excluding 0x200-0x207
> 0x220-0x22f 0x330-0x337 0x378-0x37f 0x388-0x38f
> pcmcia_socket pcmcia_socket0: cs: IO port probe 0x3e0-0x4ff: clean.
> pcmcia_socket pcmcia_socket0: cs: IO port probe 0x820-0x8ff: clean.
> pcmcia_socket pcmcia_socket0: cs: IO port probe 0xc00-0xcf7: clean.
> pcmcia_socket pcmcia_socket0: cs: IO port probe 0x3c0-0x3d2: clean.
> pcmcia_socket pcmcia_socket0: cs: IO port probe 0x3d4-0x3df: clean.
> pcmcia_socket pcmcia_socket0: cs: IO port probe 0x1000-0x17ff: clean.
> pcmcia_socket pcmcia_socket0: cs: IO port probe 0xa00-0xaff: clean.
> pcmcia_socket pcmcia_socket0: pccard: PCMCIA card inserted into slot 0
> pcmcia_socket pcmcia_socket0: cs: memory probe 0xa0000000-0xa0ffffff: clean.
> pcmcia 0.0: pcmcia: registering new device pcmcia0.0
> scsi2 : pata_pcmcia
> ata3: PATA max PIO0 cmd 0x100 ctl 0x10e irq 3
> ata3.01: both IDENTIFYs aborted, assuming NODEV
> ata3.00: CFA: IBM-DMDM-10340, MD2IC501, max PIO1
> ata3.00: 700560 sectors, multi 0: LBA
> ata3.00: configured for PIO0
> isa bounce pool size: 16 pages
> scsi 2:0:0:0: Direct-Access ATA IBM-DMDM-10340 MD2I PQ: 0 ANSI: 5
> sd 2:0:0:0: [sdb] 700560 512-byte logical blocks: (358 MB/342 MiB)
> 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: Attached scsi generic sg2 type 0
>     sdb: sdb1
> sd 2:0:0:0: [sdb] Attached SCSI removable disk
>
> Now my transfer rate has increased to 20 kilobyte / second read, about
> 4 times faster than before but still pretty slow.

Well, it could be that IRQ delivery still isn't working quite properly 
somehow (irqpoll shouldn't really be needed if everything is working 
properly). The adapter only supports PIO0 so you definitely won't get 
more than about 3 MB/sec and probably a fair bit slower than that, but 
20 KB/sec still seems a bit abnormal..

CCing linux-ide.
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