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To: alan@lxorguk.ukuu.org.uk (Alan Cox)
Cc: linux-kernel@vger.kernel.org
Subject: Re: IDE/ATAPI in 2.5
References: <200207142004.g6EK4LaV019433@burner.fokus.gmd.de>
	<1026683185.13886.81.camel@irongate.swansea.linux.org.uk>
From: Mathieu Chouquet-Stringer <mathieu@newview.com>
Date: 14 Jul 2002 16:45:55 -0400
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Forgot to copy lkml... :-(

alan@lxorguk.ukuu.org.uk (Alan Cox) writes:
> On Sun, 2002-07-14 at 21:21, Mathieu Chouquet-Stringer wrote:
> > I'm running tar (the regular version not star) right now on an Athlon @
> > 850. The fs is ext3 and the disk is a scsi drive.
> > So far, tar has been running for 17 min 25 sec, and that's what top says:
> > CPU states:  1.7% user, 98.2% system,  0.0% nice,  0.0% idle
>                  ^^^^^^^^^^^^^^^^^^^^^^^^
> 
> Why are using PIO mode devices ?

That's a scsi drive so I would guess it uses dma. The interface:
Jul 13 16:35:50 mcs kernel: sym.0.11.0: setting PCI_COMMAND_PARITY...
Jul 13 16:35:50 mcs kernel: sym0: <895> rev 0x1 on pci bus 0 device 11 function 0 irq 10
Jul 13 16:35:50 mcs kernel: sym0: Tekram NVRAM, ID 7, Fast-40, LVD, parity checking
Jul 13 16:35:50 mcs kernel: sym0: SCSI BUS has been reset.
Jul 13 16:35:50 mcs kernel: spurious 8259A interrupt: IRQ7.
Jul 13 16:35:50 mcs kernel: scsi0 : sym-2.1.17a

And the drive:
Jul 13 16:35:50 mcs kernel:   Vendor: IBM       Model: DDYS-T18350N     Rev: S96H
Jul 13 16:35:50 mcs kernel:   Type:   Direct-Access                     ANSI SCSI revision: 03
[...]
Jul 13 16:35:51 mcs kernel: sym0:0:0: tagged command queuing enabled, command queue depth 32.
[...]
Jul 13 16:35:51 mcs kernel: Attached scsi disk sda at scsi0, channel 0, id 0, lun 0
[...]
Jul 13 16:35:51 mcs kernel: sym0:0: FAST-40 WIDE SCSI 80.0 MB/s ST (25.0 ns, offset 31)
-- 
Mathieu Chouquet-Stringer              E-Mail : mathieu@newview.com
    It is exactly because a man cannot do a thing that he is a
                      proper judge of it.
                      -- Oscar Wilde
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