[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Some questions
- To: Mailing List Recipients <pci-sig-request@znyx.com>
- Subject: Re: Some questions
- From: "John R Pierce" <pierce@hogranch.com>
- Date: Fri, 6 Dec 1996 18:58:09 -0800
- Resent-Date: Fri, 6 Dec 1996 18:58:09 -0800
- Resent-From: pci-sig-request@znyx.com
- Resent-Message-Id: <"NalNd3.0.vc2.2sDgo"@dart>
- Resent-Sender: pci-sig-request@znyx.com
Kimmery, Clifford (FL51) <kimmery@space.honeywell.com> writes...
>
> Does this mean that most CPU-PCI bridges do not attempt to prefetch
> unless the target address is known to be cacheable?
>
> An agent can be prefetchable (no read side-effects) without being
> cacheable (no potential for hidden changes).
prefetch CAN have side effects if it reads excessive words from a data transfer
fifo (such as many graphics chips use).
-jrp
x ì Ü