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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