netdev - Re: [PATCH net-next] myri10ge: Add support for ndo_busy

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Message-ID: <Pine.GSO.4.44.1308190431470.20676-100000@adel>
Date:	Mon, 19 Aug 2013 05:20:57 -0700 (PDT)
From:	Hyong-Youb Kim <hykim@...i.com>
To:	"David S. Miller" <davem@...emloft.net>
cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] myri10ge: Add support for ndo_busy_poll

Just for the record, here are a couple TCP_RR numbers from netperf.
Polling has the intended effect on this driver too.

Setup:
Linux 3.11-rc5 with many of unused features disabled
A couple machines with an E31270 CPU and a single-port 10G-PCIE-8B-S NIC
No switches
netperf 2.6.0
ethtool -C eth2 rx-usecs 0
ethtool -K eth2 gro off

net.core.busy_read=0: 53385.06 trans/s
net.core.busy_read=50: 87898.95 trans/s

The increase from busy_read is comparable to what Intel developers
reported earlier using ixgbe.

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