Re: e1000 82571 Packet Splitting

From: Jeff V. Merkey
Date: Tue Nov 22 2005 - 18:52:31 EST

Jesse Brandeburg wrote:

this should be on netdev.

On 11/22/05, Jeff V. Merkey <jmerkey@xxxxxxxxxxxxxxxxxx> wrote:

I have noted that the e1000 driver is now supporting DMA splitting of
the packet header and payload into separate pages. I also noticed
that none of the config options enable it. Is anyone using this feature
at present and has it even been tested on Linux?

The 6.2.15 driver off will enable it
by default. We've gone through our release approval, which includes
quite a bit of testing.
If the patches posted recently don't include that support, I missed
something :-)

This is only on the 82571 and greater hardware that packet split is
supported, BTW.

Got it. I am merging packet capture support into the e1000 for DSFS for direct cache DMA support. I noticed the two distinct fill routines
for the ring buffer. I have enabled DSFS for both with this driver. I will post patches late tonight or in the morning for the 82571 support for DSFS. I will
also be posting the patches for 2.6.12, 2.6.10. 2.6.14, Suse 9 and 10.0, Red Hat ES/AS 3 and 4, and Fedora Core 2/3/4 by end of week with the
packet splitting capabilities with packet capture on DSFS. This is a very good optimization and should come in handy for reducing header copies
in the protocol stacks.


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