Re: [Fwd: [E1000] NAPI re-insertion w/ changes]

Robert.Olsson@data.slu.se said:

10 Million pkts injected at high speed into eth2 and forwarded to eth3. Rx and 
Tx buffers are 256 and HW_FLOW is disabled and RxIntDelay=1. Which is same 
parameters as we use for production systems. As seen link now flaps. 
Eventually can hw_flowcontrol and interrupt delays help this... but thats not 
an option at least not for us. 


Twist:        New                        Old
             ====================================
Input rate:    680 (due to link drop)    820 kpps
T-put:         309                       385 kpps 
RX irq's:    78963                       434

I've seen pretty much the same thing. I plotted throughput vs. offered
load for e1000 4.4.12-k1, 4.4.19-k3, and 5.0.43-k1 (all backported to
2.4.20). A summary with graphs is at:

http://gtf.org/lunz/linux/net/perf/

5.0.43 seems to be a significant regression, both in terms of throughput
and CPU load.

-- 
Jason Lunz			Reflex Security
lunz@reflexsecurity.com		http://www.reflexsecurity.com/