Recieving and transmitting large volumes of data is where zbufs would be a
help.  NetBSD on large data transmits of memory mapped files does a minimal
amount of coping, but recieving large amounts of data is another question.
Does NetBSD perform the same way when receiving data from the network to a
memory mapped file?  

When recieving data that is measured in megabytes per second, and with
networks moving to 10 Megabytes (100Mbit/sec) to 100 Megabytes
(1000Mbits/sec), it would seem that doing a zero copy recieve would be
advantageous.   Preallocating recieve buffers and managing VM tables would
seem a faster solution than memcpy when dealing with megabytes/sec data
speeds.

Kyle

-----Original Message-----
From: Jason R Thorpe [mailto:thorpej@wasabisystems.com]
Sent: Friday, September 06, 2002 11:08 AM
To: kyle.unice@L-3com.com
Cc: david@l8s.co.uk; tech-kern@netbsd.org
Subject: Re: zbufs for NetBSD


On Fri, Sep 06, 2002 at 10:53:10AM -0600, kyle.unice@L-3com.com wrote:

 > Just wanted to follow up and see what decision (if any) has been made
about
 > zbufs and NetBSD.

No decision has been reached, as far as I can tell.  I think I still need
a lot of convincing that they're really necessary :-)

-- 
        -- Jason R. Thorpe <thorpej@wasabisystems.com>