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Date: Sun, 8 Feb 2004 01:08:30 -0800
From: Mike Fedyk <mfedyk@matchmail.com>
To: "Francis, Chong Chan Fai" <francis.ccf@polyu.edu.hk>
Cc: linux-kernel@vger.kernel.org
Subject: Re: USB 2.0 mass storage problem
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On Sun, Feb 08, 2004 at 02:58:17PM +0800, Francis, Chong Chan Fai wrote:
> > Probably a problem with pcmcia.
> 
> > I've used a usb 2.0 pci card, but the cpu usage is so high that it's just
> as
> > fast as the same card using the uhci-hcd driver -- and uhci uses *much*
> > less cpu.
> 
> Thank you for your reply.
> 
> I don't have the performance problem with USB2.0, it read a file lightning
> fast (compare with USB 1.0), but just hang shortly after a few files.

It was a pII 300... not a dino, but getting old.

> 
> I using USB 1.0 as a work around, but my disk is 120G and the speed is
> terrible.
> 
> Because the command " lspci " show the PCMCIA bus correctly, I didn't
> thought it could be a problem. If it is the case, what can I do? 

Can you run "dd < /dev/sda > /dev/null" on the usb drive without a hang/crash?

Turn on the nmi_watchdog.  There is documentation in the kernel source
tree, and on the web...