So, fire up you favorite networking performance tool and compare the
performance gains between 2.5.32 and 2.5.33 using e1000. I ran a quick test
on a dual P4 workstation system using the commercial tool Chariot:
Tx/Rx TCP file send long (bi-directional Rx/Tx)
w/o TSO: 1500Mbps, 82% CPU
w/ TSO: 1633Mbps, 75% CPU
Tx TCP file send long (Tx only)
w/o TSO: 940Mbps, 40% CPU
w/ TSO: 940Mbps, 19% CPU
A good bump in throughput for the bi-directional test. The Tx-only test was
already at wire speed, so the gains are pure CPU savings.
I'd like to see SPECWeb results w/ and w/o TSO, and any other relevant
testing. UDP framentation is not offloaded, so keep testing to TCP.
-scott
[1] Kudos to Alexey Kuznetsov for enabling the stack with TSO support, to
Chris Leech for providing the e1000 bits and a prototype stack, and to David
Miller for consultation.
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