Re: [PATCH] pktgen: add a new sample script for 40G and above link testing
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From: Robert Hoo <hidden>
Date: 2017-09-01 13:53:50
On Sun, 2017-08-27 at 11:25 +0300, Tariq Toukan wrote:
On 25/08/2017 12:26 PM, Robert Hoo wrote:quoted
(Sorry for yesterday's wrong sending, I finally fixed my MTA and git send-email settings.) It's hard to benchmark 40G+ network bandwidth using ordinary tools like iperf, netperf (see reference 1). Pktgen, packet generator from Kernel sapce, shall be a candidate. I then tried with pktgen multiqueue sample scripts, but still cannot reach line rate.Try samples 03 and 04.
Thanks Tariq for review. Sorry for late reply; I do this part time. Yes, I just tried sample 03 and 04. They can approximately reach 40G line rate; though still slightly less than my script :) (see my reply to Jesper).
quoted
I then derived this NUMA awared irq affinity sample script from multi-queue sample one, successfully benchmarked 40G link. I think this can also be useful for 100G reference, though I haven't got device to test yet. This script simply does: Detect $DEV's NUMA node belonging. Bind each thread (processor from that NUMA node) with each $DEV queue's irq affinity, 1:1 mapping. How many '-t' threads input determines how many queues will be utilized.I agree this is an essential capability. This was the main reason I added support for the -f argument. Using it, I could choose cores of local NUMA, especially for single thread, or when cores of the NUMA are sequential.
Indeed this argument is very helpful. Sorry I haven't taken it into consideration in v1. I should consider this, what if user designate '-f'. I can improve this in v2.
quoted
Tested with Intel XL710 NIC with Cisco 3172 switch. It would be even slightly better if the irqbalance service is turned off outside. Referrences: https://people.netfilter.org/hawk/presentations/LCA2015/net_stack_challenges_100G_LCA2015.pdf http://www.intel.cn/content/dam/www/public/us/en/documents/reference-guides/xl710-x710-performance-tuning-linux-guide.pdf Signed-off-by: Robert Hoo <redacted> ---Regards, Tariq Toukan