Subject: Re: presto support?
To: Matthew Jacob <>
From: Matt Thomas <>
List: current-users
Date: 02/11/1998 18:32:52
At 05:36 PM 2/11/98 , Matthew Jacob wrote:

>Yes, this is true. But also note that PrestoServe memory cards
>are slave only devices. Assuming a TurboChannel or SBus or PCI
>memory card you're stashing data in you pay for not only the
>CPU cycles of moving the data, but moving it in a really undesirable
>manner (across several bus bridges, little help from a cache
>prefetch, and also providing massive interference for other I/O
>that may be occurring). The tradeoffs are not always obvious.

Actually the PCI card has a DMA engine...
Matt Thomas               Internet:
3am Software Foundry      WWW URL:
Nashua, NH                Disclaimer: I disavow all knowledge of this message