Following are some common parameters that can be changed:
# ethtool -c eth8
Coalesce parameters for eth8: Adaptive RX: off TX: off stats-block-usecs: 0 sample-interval: 0 pkt-rate-low: 0 pkt-rate-high: 0
rx-usecs: 8
rx-frames: 512
rx-usecs-irq: 0
rx-frames-irq: 512
tx-usecs: 0
tx-frames: 0
tx-usecs-irq: 0
tx-frames-irq: 0
rx-usecs-low: 0
rx-frame-low: 0
tx-usecs-low: 0
tx-frame-low: 0
rx-usecs-high: 0
rx-frame-high: 0
tx-usecs-high: 0
tx-frame--high: 0
rx-usecs and rx-frames control the RX interrupt rate per RX DMA channel. RX interrupt will be generated after rx-frames have been received or after rx-usecs time interval if fewer than rx-frames have been received within the interval. For low latency applications, it is recommened to set rx-usecs to smaller value. For bulk traffic, it is recommended to use larger values of rx-usecs and control the rate with rx-frames.
rx-frames-irq controls the maximum number of rx packets processed with a single RX interrupt.
48 Sun Dual 10GbE XFP PCI Express Card User’s Guide • January 2009
