From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Lunz Subject: Re: [Fwd: [E1000] NAPI re-insertion w/ changes] Date: Thu, 27 Mar 2003 17:10:03 +0000 (UTC) Sender: netdev-bounce@oss.sgi.com Message-ID: References: <16003.11449.497905.815776@robur.slu.se> Return-path: To: netdev@oss.sgi.com Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org 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/