linux-kernel - Re: [Xen-devel] [PATCH 3/4] usb: Introduce Xen pvUSB backend

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Message-ID: <54F71468.3030207@citrix.com>
Date:	Wed, 4 Mar 2015 14:19:20 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Juergen Gross <jgross@...e.com>,
	David Vrabel <david.vrabel@...rix.com>,
	<linux-kernel@...r.kernel.org>, <xen-devel@...ts.xensource.com>,
	<konrad.wilk@...cle.com>, <boris.ostrovsky@...cle.com>,
	<linux-usb@...r.kernel.org>, <gregkh@...uxfoundation.org>,
	<cyliu@...e.com>
Subject: Re: [Xen-devel] [PATCH 3/4] usb: Introduce Xen pvUSB backend

On 04/03/15 14:09, Juergen Gross wrote:
> 
> The main question whether it is worth to consider this alternative is
> the performance aspect. Does anyone have an idea which USB devices would
> typically be used via pvusb? I'd suspect memory sticks and USB disks
> and perhaps webcams being the most performance relevant ones. Is an
> additional copy operation of user data acceptable here?

I have no idea.  We (XenServer) have no use cases at all for USB device
passthrough.

David
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