Randell Jesup wrote...
> This discussion should probably move to the freebsd-scsi list...
>
> "Kenneth D. Merry" <[EMAIL PROTECTED]> writes:
> >Nick Hibma wrote...
> >> Especially some help on the topic of polling would be appreciated.
> >> Otherwise I'll have to resort to figuring out how to do things in
> >> interrupt context, and that is going to be dirty.
>
> >If you're talking about polling for transaction completion in a device
> >driver, my guess is that you're going to have to do things in an interrupt
> >context. (Unless you use a kernel process to do it.)
> >
> >The thing to remember is that when you get CCBs down in a CAM device
> >driver, it may well be in an interrupt context. You have to be able to
> >deal with that. My guess is that it might be easiest to just use a timeout
> >handler to poll the device for completion every so often. A kernel process
> >may also be an option, depending on how nasty the device is.
>
> Ick. Polling == bad. Interrupts == good. This isn't a single-
> tasking OS ala Win9x. This goes double for SCSI drivers, which are
> inherently async and overlapped.
I never said polling was good. Nick just asked about polling, and I
commented on how it could be done. I have no idea why he wanted to know
about polling, though.
Ken
--
Kenneth Merry
[EMAIL PROTECTED]
To Unsubscribe: send mail to [EMAIL PROTECTED]
with "unsubscribe freebsd-hackers" in the body of the message
