Re: [Xen-devel] how can native driver response quickly for low FIFO device

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 25 May 2006, at 15:21, Dong, Eddie wrote:

> Oo, understand UART is handled by Xen, Is this because of this reason?
> or for debug/console use, and how about other devices?
> If a user has an PCI card with 8 UART in the box, will we have problem?
> thx,eddie
Oh, now I see your point. Yes, for any serial device not handled by Xen 
you could have a scheduling problem. Other examples include telephony 
interface cards and their drivers (e.g., zaptel). Higher-rate UARTs do 
tend to support bigger FIFOs in hardware though. Best bet if it really 
matters is to dedicate a logical processor to the domain that owns the 
hardware.
 -- Keir


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