From: Ian Campbell <ian.campbell@citrix.com>
To: David Vrabel <david.vrabel@citrix.com>
Cc: Juergen Gross <jgross@suse.com>, <linux-kernel@vger.kernel.org>,
<xen-devel@lists.xensource.com>, <konrad.wilk@oracle.com>,
<boris.ostrovsky@oracle.com>, <linux-usb@vger.kernel.org>,
<gregkh@linuxfoundation.org>, <cyliu@suse.com>
Subject: Re: [Xen-devel] [PATCH 3/4] usb: Introduce Xen pvUSB backend
Date: Wed, 4 Mar 2015 14:29:10 +0000 [thread overview]
Message-ID: <1425479350.25940.177.camel@citrix.com> (raw)
In-Reply-To: <54F71468.3030207@citrix.com>
On Wed, 2015-03-04 at 14:19 +0000, David Vrabel wrote:
> 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.
My gut feeling is that for USB 1 and 2 the bus itself isn't fast enough
that anyone would care. qdisk has acceptable for disks, so it's probably
ok for usb too.
For usb 3 onwards, well, maybe when we care about those we'll decide
that a kernel space driver is needed, but for now it seems like
userspace would be ok.
Ian.
next prev parent reply other threads:[~2015-03-04 14:29 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-26 13:35 [PATCH 0/4] xen, usb: support pvUSB drivers Juergen Gross
2015-02-26 13:35 ` [PATCH 1/4] usb: Add Xen pvUSB protocol description Juergen Gross
2015-02-26 13:35 ` [PATCH 2/4] usb: Introduce Xen pvUSB frontend Juergen Gross
2015-02-26 14:09 ` Oliver Neukum
2015-02-26 13:35 ` [PATCH 3/4] usb: Introduce Xen pvUSB backend Juergen Gross
2015-03-02 11:39 ` [Xen-devel] " David Vrabel
2015-03-04 13:31 ` Juergen Gross
2015-03-04 13:41 ` Ian Campbell
2015-03-04 13:45 ` Juergen Gross
2015-03-04 13:53 ` David Vrabel
2015-03-04 14:09 ` Juergen Gross
2015-03-04 14:19 ` David Vrabel
2015-03-04 14:29 ` Ian Campbell [this message]
2015-03-04 14:41 ` Juergen Gross
2015-03-04 14:43 ` Peter Stuge
2015-03-04 14:46 ` Ian Campbell
2015-03-06 10:59 ` Pasi Kärkkäinen
2015-03-06 12:52 ` Austin S Hemmelgarn
2015-03-04 15:27 ` Greg KH
2015-03-04 15:31 ` Juergen Gross
2015-02-26 13:35 ` [PATCH 4/4] xen: add Xen pvUSB maintainer Juergen Gross
2015-02-26 17:25 ` Konrad Rzeszutek Wilk
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