Re: [Xen-devel] [PATCH] Re-enable LTR/OBFF when device is owned by pciback

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 23.04.12 at 05:16, "Hao, Xudong" <xudong.hao@xxxxxxxxx> wrote:
>> From: Konrad Rzeszutek Wilk [mailto:konrad.wilk@xxxxxxxxxx]
>> On Sun, Apr 22, 2012 at 03:25:04PM +0000, Hao, Xudong wrote:
>> > +  pci_set_ltr(dev, snoop_lat_ns, nosnoop_lat_ns);
>> 
>> OK, but didn't you just come with up those values?
>> 
> 
> The value should be set by driver, but now seems no real device support 
> these two feature, at least I don't know such a device, and no driver call 
> ltr/obff function. 
> I just set the max value as default here, any suggestion?

Matching my previous reply - why don't you just let the guest do
this itself, should it so desire, thus allowing it to pick a suitable
value.

Jan


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