On Thu, 2003-09-18 at 09:48, Leon Brooks wrote:
> Please CC the original poster in on any replies.
>
> ---------- Forward ----------
>
> Date: Thu, 18 Sep 2003 05:02
> From: K Montgomery <[EMAIL PROTECTED]>
>
> Hello All,
>
> I just bought a KTI 6-in-1 USB flash card reader from Directron.com.
> It claims to be compatible with Linux, which I've found to be true...
> in the strictest sense of the word "compatible."
>
> I am able to access the drive (the CompactFlash slot) on /dev/sda1, but
> mounting and viewing file contents is absurdly SLOW. I tried to copy
> several files off the card and the operation seemed to take minutes per
> file.
>
Writing to USB CF things is slow, as the CF medium is slow for writes.
I get reasonably spiffy performance on reads - slow, but reasonable.
Are you getting SCSI timeouts in /var/log/{messages|syslog}? The only
time I had treacle like performance was when it was getting lots of
timeouts and there were lots of SCSI resets happening. Remember - this
stuff runs a SCSI emulation layer.
> I am seeing this pair of messages in /var/log/syslog:
> Sep 17 16:35:24 KmacG4 kernel: sr0: mmc-3 profile: 0h
> Sep 17 16:35:24 KmacG4 kernel: cdrom: open failed.
>
You just have a CD with no disc loaded and supermount or the CD audio
player thingy is looking..
> Here's the pertinent line from /etc/fstab (may wrap):
> /dev/sda1 /mnt/removable auto
> users,iocharset=iso8859-1,codepage=850,noauto 0 0
>
> (That line was automatically added by something, don't know what.)
>
The hotplug mechanism when you stuff the card in (in essence - it's a
bit more complex than that however).
> Anyone have any ideas on why this reader is behaving so sluggishly in
> Linux? (Works just fine on Mac OS.)
>
As an owner of a 6-in-1 reader that is also "supported" by Linux, my
only issues with them are:
(1) SCSI LUNs are not all probed by default (so you only get the CF
slot)
(2) Some kernels from MDK have serious usb-storage <-> SCSI issues,
usually timeouts resulting in either a hard crash (on SMP systems) or
very sluggish performance.
(3) I have to remove usb-storage when I plug things in the second time
to get the hotplug mechanisms to wake up and do something. When I get
some spare mSecs, I'll try to fix this one!
Cheers
/Kevin
--
Kevin J. Maciunas Net: [EMAIL PROTECTED]
Dept. of Computer Science Ph : +61 8 8303 5845
University of Adelaide Fax: +61 8 8303 4366
Adelaide 5005 SOUTH AUSTRALIA Web: http://www.cs.adelaide.edu.au/~kevin
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