RE: A question on Zero Copy

[Douglas Otis <dotis@sanlight.net>]

Y.P.

In Julian's defense, I suspect most targets will be dedicated appliances
where memory handling is specialized to the point of not being influenced
greatly by discontinuities created in blind placement of segments.  I doubt
there is anything within the protocol that would allow a target advanced
knowledge of segment content.  Otherwise, you are right about needing
content directed zero copy witin the target as well.

Doug

> > From: owner-ips@ece.cmu.edu [mailto:owner-ips@ece.cmu.edu]On Behalf Of
> > julian_satran@il.ibm.com
> > Sent: Tuesday, December 05, 2000 8:58 PM
> >
> > Randall,
> >
> > What you want depends on what end and what application you are
> looking at.
> > A target (in most cases) can live with A  while a complex
> initiator (host,
> > not an appliance) will want B.
>
> I question if target can live with A alone.  While it is true for
> unsolicited messages, for solicited messages resulting from resource
> management, the target uses R2T and "target task tag" to direct incoming
> messages to desired buffers.
>
> Y.P. Cheng
>
>