Re: [PATCH + RFC] Beginning of some updates to scsi mid layer

Doug Ledford
2002-07-01T19:15:53Z

On Mon, Jul 01, 2002 at 12:08:03PM -0700, Matthew Jacob wrote:
> Yes, exponential backoff is good in a lot of cases. BTW- this is something I
> want to put into cam_periph_error for FreeBSD- I want to make the retry after
> selection timeout also have exponential delays up to retry count.

Hmmm...what's the purpose on this BTW? Selection timeouts on what, fiber
or SPI or something else?

> In private mail with Doug && Pete, I managed to put myself into an untenable
> position. The problem here is that we don't have end-to-end flow control, so
> we have to *guess* when it might be good to try again.

Yep. Experimentation can be your friend on that. That's what I did to
come up with the alghorithm I was quoting. However, I didn't try
exponential backoff so I make no claims that it wouldn't in fact be
better.

--
Doug Ledford <dledford@redhat.com> 919-754-3700 x44233
Red Hat, Inc.
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