Re: USB/hal: USB open() broken? (USB CD burner underruns, USB HDDhard resets)

[Andrew Morton]

On Mon, 19 Jun 2006 10:21:54 +0200
Andreas Mohr <andi@xxxxxxxxxxxxxxxxxxxxxxx> wrote:

> I'm having severe issues with cdrecord aborting with "buffer underrun"
> message, *always*. Problem nailed, see below.

[hald polling causes cdrecord to go bad on a USB CD drive]

One possible reason is that we're shooting down the device's pagecache by
accident as a result of hald activity.  This shouldn't happen, but still.
Could you please do

`watch -n1 cat /proc/meminfo' and/or `vmstat 1'

then run cdrecord

then wait a bit

then run hald, see if the amount of pagecache (/proc/meminfo:Buffers or
/proc/meminfo:Cached) suddenly decreases.

If the answer is "no" then I guess there's some unpleasant interaction
happening at the USB level

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