Subject: RE: zbufs for NetBSD
To: None <,>
From: None <>
List: tech-kern
Date: 09/06/2002 14:11:31
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


-----Original Message-----
From: Jason R Thorpe []
Sent: Friday, September 06, 2002 11:08 AM
Subject: Re: zbufs for NetBSD

On Fri, Sep 06, 2002 at 10:53:10AM -0600, wrote:

 > Just wanted to follow up and see what decision (if any) has been made
 > 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 <>