From mboxrd@z Thu Jan  1 00:00:00 1970
From: Todd And Margo Chester <toddandmargo@gmail.com>
Subject: USB is really slow on my host
Date: Wed, 14 Dec 2011 09:41:02 -0800
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> Hi All,
>
> Scientific Linux 6.1 x64
> qemu-kvm-0.12.1.2-2.160.el6_1.2.x86_64
>
> I do not have USB configured in any of my guests.
> Since adding KVM to my host, my USB 2.0 ports on
> my host are all acting like USB 1.0 ports (20 times
> slower).
>
> Is there a work around for this?
>
> Many thanks,
> -T

A kernel update fixed this.  Go figure ...