e1000 82571 Packet Splitting

e1000 82571 Packet Splitting

[Jeff V. Merkey]

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? 

Jeff

Re: e1000 82571 Packet Splitting

[Jesse Brandeburg]

this should be on netdev.

On 11/22/05, Jeff V. Merkey <jmerkey@soleranetworks.com> 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 http://prdownloads.sf.net/e1000 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.

Re: e1000 82571 Packet Splitting

[Jeff V. Merkey]

Jesse Brandeburg wrote:

>this should be on netdev.
>
>On 11/22/05, Jeff V. Merkey <jmerkey@soleranetworks.com> 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 http://prdownloads.sf.net/e1000 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.

Jeff