On 1/4/16, 9:16 PM, "Stephen Hemminger" [off-list ref] wrote:

On Mon,  4 Jan 2016 18:28:16 -0800
Yong Wang [off-list ref] wrote:

quoted

Tx data ring support was removed in a previous change
to add multi-seg transmit.  This change adds it back.

Fixes: 7ba5de417e3c ("vmxnet3: support multi-segment transmit")

Signed-off-by: Yong Wang <redacted>

Do you have any numbers to confirm this?

From the original commit (2e849373):

Performance results show that this patch significantly
boosts vmxnet3 64B tx performance (pkt rate) for l2fwd
application on a Ivy Bridge server by >20% at which
point we start to hit some bottleneck on the rx side.

I also re-did the same test on a different setup (Haswell
processor, ~2.3GHz clock rate) on top of the master with
this set of patches and still observed ~17% performance
gains.