Re: Issue mounting USB mass-storage drive

[Bruce Nagel <nagelbh%SDF.ORG@localhost>]

On Fri, 28 Dec 2018, Michael van Elst wrote:

> Date: Fri, 28 Dec 2018 08:45:15 -0000 (UTC)
> From: Michael van Elst <mlelstv%serpens.de@localhost>
> To: netbsd-users%netbsd.org@localhost
> Newsgroups: lists.netbsd.users
> Subject: Re: Issue mounting USB mass-storage drive

> nagelbh%sdf.org@localhost (Bruce Nagel) writes:

> > umass0: failed to create xfers

> Usually means the kernel ran out of (contigous) memory. This can be
> a consequence of using USB3, the xhci driver does not support
> multi-segment DMA yet.

> It should only happen after some larger uptime when kernel memory
> might be too fragmented.

'Turning it off and back on' did resolve the issue, so probably 'myth 
confirmed'. :-)  I had an uptime beyond a month when this issue presented 
itself.  Trying again the next day after rebooting allowed mounting the 
drive it is still working okay.

I'm guessing there isn't a simple means to use USB2 drivers and avoid this 
issue?  Nothing in the case is newer than 2012 so I don't need USB3 
support.

Thanks,
Bruce
--
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