[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] how can native driver response quickly for low FIFO device
Keir Fraser wrote: > 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. > Yes :-) Fortunately most devices in modern computer has either big FIFO or DMA support. Those kind of low FIFO device will be headache in VM environment. Dedicated LP is a good choice, further more HT can take the advantage here :-) Eddie _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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