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From: Andrew Morton <akpm@osdl.org>
To: Andreas Mohr <andi@rhlx01.fht-esslingen.de>
Cc: linux-kernel@vger.kernel.org, hal@lists.freedesktop.org,
	gregkh@suse.de, linux-usb-devel@lists.sourceforge.net
Subject: Re: USB/hal: USB open() broken? (USB CD burner underruns, USB HDD hard resets)
Date: Tue, 20 Jun 2006 01:37:41 -0700	[thread overview]
Message-ID: <20060620013741.8e0e4a22.akpm@osdl.org> (raw)
In-Reply-To: <20060619082154.GA17129@rhlx01.fht-esslingen.de>

On Mon, 19 Jun 2006 10:21:54 +0200
Andreas Mohr <andi@rhlx01.fht-esslingen.de> 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


  reply	other threads:[~2006-06-20  8:37 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-06-19  8:21 Andreas Mohr
2006-06-20  8:37 ` Andrew Morton [this message]
2006-06-20  8:47   ` Andreas Mohr
2006-06-20  8:56     ` Andrew Morton
2006-06-20  9:06   ` [linux-usb-devel] " Alan Cox
2006-06-20  9:05     ` Andreas Mohr
2006-06-20 10:18       ` Alan Cox
2006-06-20 14:22       ` Alan Stern
2006-06-21  9:33         ` Andreas Mohr
2006-06-21 16:15           ` Alan Stern
2006-06-21 16:44             ` Andreas Mohr
2006-06-21 19:06               ` Alan Stern
2006-06-21 20:52                 ` Alan Cox
2006-06-21 20:08               ` Pete Zaitcev
2006-06-21  9:10   ` Andreas Mohr

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