netdev - Re: [PATCH RFC net-next 1/2] net: Reference bpf_redirect_info via task_struct on PREEMPT

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Date: Tue, 20 Feb 2024 11:17:41 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Jesper Dangaard Brouer <hawk@...nel.org>
Cc: Toke Høiland-Jørgensen <toke@...hat.com>,
	bpf@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH RFC net-next 1/2] net: Reference bpf_redirect_info via
 task_struct on PREEMPT_RT.

On 2024-02-20 10:17:53 [+0100], Jesper Dangaard Brouer wrote:
> 
> 
> On 19/02/2024 20.01, Toke Høiland-Jørgensen wrote:
> > may be simpler to use pktgen, and at 10G rates that shouldn't become a
> > bottleneck either. The pktgen_sample03_burst_single_flow.sh script in
> > samples/pktgen in the kernel source tree is fine for this usage.
> 
> Example of running script:
>  ./pktgen_sample03_burst_single_flow.sh -vi mlx5p1 -d 198.18.1.1 -m
> ec:0d:9a:db:11:c4 -t 12
> 
> Notice the last parameter, which is number threads to start.
> If you have a ixgbe NIC driver, then I recommend -t 2 even if you have more
> CPUs.

I get 
| Summary                 8,435,690 rx/s                  0 err/s
| Summary                 8,436,294 rx/s                  0 err/s

with "-t 8 -b 64". I started with 2 and then increased until rx/s was
falling again. I have ixgbe on the sending side and i40e on the
receiving side. I tried to receive on ixgbe but this ended with -ENOMEM
| # xdp-bench drop eth1
| Failed to attach XDP program: Cannot allocate memory

This is v6.8-rc5 on both sides. Let me see where this is coming from…

> --Jesper

Sebastian