Network stack changes

[Alexander V. Chernikov]

On 29.08.2013 05:32, Slawa Olhovchenkov wrote:
> On Thu, Aug 29, 2013 at 12:24:48AM +0200, Andre Oppermann wrote:
>
>>> ..
>>> while Intel DPDK claims 80MPPS (and 6windgate talks about 160 or so) on the same-class hardware and
>>> _userland_ forwarding.
>> Those numbers sound a bit far out.  Maybe if the packet isn't touched
>> or looked at at all in a pure netmap interface to interface bridging
>> scenario.  I don't believe these numbers.
> 80*64*8 = 40.960 Gb/s
> May be DCA? And use CPU with 40 PCIe lane and 4 memory chanell.
Intel introduces DDIO instead of DCA: 
http://www.intel.com/content/www/us/en/io/direct-data-i-o.html
(and it seems DCA does not help much):
https://www.myricom.com/software/myri10ge/790-how-do-i-enable-intel-direct-cache-access-dca-with-the-linux-myri10ge-driver.html
https://www.myricom.com/software/myri10ge/783-how-do-i-get-the-best-performance-with-my-myri-10g-network-adapters-on-a-host-that-supports-intel-data-direct-i-o-ddio.html

(However, DPDK paper notes DDIO is of signifficant helpers)