On Tue, 2006-06-27 at 10:16 -0700, Chris A. Icide wrote: > What version of the linux kernel & tg3 drivers are required to support both > rx and tx mitigation?
ethtool -C for tg3 was added around July of 2005. The version with this change added was 3.33. > What do the ethtool coalescence settings actually do (I've not been able to > find actual descriptions of the different parameters in the -C section) They set the delay between the tx and rx events and the generation of interrupts for those events. These are the only parameters that are relevant for tg3: rx-frames[-irq] rx-usecs[-irq] tx-frames[-irq] tx-usecs[-irq] The frames parameters specify how many packets are received/transmitted before generating an interrupt. The usecs parameters specify how many microseconds after at least 1 packet is received/transmitted before generating an interrupt. The [-irq] parameters are the corresponding delays in updating the status when the interrupt is disabled. > Is there anything special that needs to be done when compiling a kernel to > enable this feature for both the kernel and the tg3 driver. No. > 05:01.1 Ethernet controller: Broadcom Corporation NetXtreme BCM5704S > Gigabit Ethernet (rev 10) > Subsystem: IBM: Unknown device 02e8 > Flags: bus master, 66Mhz, medium devsel, latency 64, IRQ 201 > Memory at dcfe0000 (64-bit, non-prefetchable) [size=64K] > Capabilities: [40] PCI-X non-bridge device. > Capabilities: [48] Power Management version 2 > Capabilities: [50] Vital Product Data > Capabilities: [58] Message Signalled Interrupts: 64bit+ > Queue=0/3 Enable- > > Linux version 2.6.9-34.ELsmp ([EMAIL PROTECTED]) (gcc version > 3.4.5 20051201 (Red Hat 3.4.5-2)) #1 SMP Thu Mar 9 06:23:23 GMT 2006 > > [EMAIL PROTECTED] ~]# ethtool -c eth1 > Coalesce parameters for eth1: > Adaptive RX: off TX: off > stats-block-usecs: 1000000 > sample-interval: 0 > pkt-rate-low: 0 > pkt-rate-high: 0 > > rx-usecs: 500 > rx-frames: 30 > rx-usecs-irq: 500 > rx-frames-irq: 20 > This means that the first interrupt will be generated after 30 packets are received or 500 microseconds after the nth packet is received (1 <= n < 30). When irq is disabled, 20 packets instead of 30 before updating status. > tx-usecs: 400 > tx-frames: 53 > tx-usecs-irq: 490 > tx-frames-irq: 5 The first tx interrupt will be generated after 53 packets are transmitted or 400 microseconds after the nth packet is transmitted (1 <= n < 53). When irq is disabled, 5 packets or 490 micosecs before updating status. If the condition for generating a tx or rx interrupt is met, you get all the accumulated tx and rx status during the interrupt. Hope this helps. - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
