Subject: Re: Source for SCSI driver info?
To: David C. Myers <>
From: Henry B. Hotz <>
List: macbsd-development
Date: 05/03/1995 11:04:22
At  8:42 AM 5/3/95 -0400, David C. Myers wrote:
>Drew's driver seems pretty complete, with multiple message queues, real and
>pseudo DMA, scatter/gather (whatever that means), and so on.
Look at readv/writev.  A single IO call using a struct iovec argument will
parcel out so many bytes to this location, so many to that, so many to the
next, etc.  It's trivial to convert to a multiple read calls, but
theoretically, potentially, more efficient, especially if you have smart IO
subsystems like channels on IBM mainframes.

Henry B. Hotz

The opinions expressed are my own,
not Loral's, and not Librascope's.