Hi,

We are currently testing small packet performance on 82574, comparing it to 
82571. Initial pktgen measurements have shown a significant difference in 
performance that is the most visible when running bidirectional traffic with 
256 byte packets.

Looking at the e1000e driver, we noticed that flag FLAG2_DMA_BURST is enabled 
for 82571 and 82572 but it is not enabled for 82574. After enabling the flag, 
the 82574 performance significantly improved, approaching the one on 82571.

Is there a reason that this flag is not enabled for 82574?

Thank you,
Denis Radovanovic
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