From owner-freebsd-usb@FreeBSD.ORG  Wed Apr 29 18:31:18 2009
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From: Hans Petter Selasky <hselasky@c2i.net>
To: freebsd-usb@freebsd.org
Date: Wed, 29 Apr 2009 20:33:48 +0200
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Subject: Re: Isochronous transfer missing frames on USB4?
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Another idea:

Have you checked that the number of isochronous frames you setup is a multiple 
of 8 ?

--HPS