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SubjectRe: [PATCH net-next 14/15 v2] net: Reference bpf_redirect_info via task_struct on PREEMPT_RT.
On 2024-05-10 18:21:24 [+0200], To Jesper Dangaard Brouer wrote:
> The XDP redirect process is two staged:

On 2024-05-07 15:27:44 [+0200], Jesper Dangaard Brouer wrote:
>
> I need/want to echo Toke's request to benchmark these changes.

I have:
boxA: ixgbe
boxB: i40e

Both are bigger NUMA boxes. I have to patch ixgbe to ignore the 64CPU
limit and I boot box with only 64CPUs. The IOMMU has been disabled on
both box as well as CPU mitigations. The link is 10G.

The base for testing I have is commit a17ef9e6c2c1c ("net_sched:
sch_sfq: annotate data-races around q->perturb_period") which I used to
rebase my series on top of.

pktgen_sample03_burst_single_flow.sh has been used to send packets and
"xdp-bench drop $nic -e" to receive them.

baseline
~~~~~~~~
boxB -> boxA | gov performance
-t2 (to pktgen)
| receive total 14,854,233 pkt/s 14,854,233 drop/s 0 error/s

-t1 (to pktgen)
| receive total 10,642,895 pkt/s 10,642,895 drop/s 0 error/s


boxB -> boxA | gov powersave
-t2 (to pktgen)
receive total 10,196,085 pkt/s 10,196,085 drop/s 0 error/s
receive total 10,187,254 pkt/s 10,187,254 drop/s 0 error/s
receive total 10,553,298 pkt/s 10,553,298 drop/s 0 error/s

-t1
receive total 10,427,732 pkt/s 10,427,732 drop/s 0 error/s

======
boxA -> boxB (-t1) gov performance
performace:
receive total 13,171,962 pkt/s 13,171,962 drop/s 0 error/s
receive total 13,368,344 pkt/s 13,368,344 drop/s 0 error/s

powersave:
receive total 13,343,136 pkt/s 13,343,136 drop/s 0 error/s
receive total 13,220,326 pkt/s 13,220,326 drop/s 0 error/s

(I the CPU governor had no impact, just noise)

The series applied (with updated 14/15)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
boxB -> boxA | gov performance
-t2:
receive total 14,880,199 pkt/s 14,880,199 drop/s 0 error/s

-t1:
receive total 10,769,082 pkt/s 10,769,082 drop/s 0 error/s

boxB -> boxA | gov powersave
-t2:
receive total 11,163,323 pkt/s 11,163,323 drop/s 0 error/s

-t1:
receive total 10,756,515 pkt/s 10,756,515 drop/s 0 error/s

boxA -> boxB | gov perfomance

receive total 13,395,919 pkt/s 13,395,919 drop/s 0 error/s

boxA -> boxB | gov perfomance
receive total 13,290,527 pkt/s 13,290,527 drop/s 0 error/s


Based on my numbers, there is just noise. BoxA hit the CPU limit during
receive while lowering the CPU-freq. BoxB seems to be unaffected by
lowing CPU frequency during receive.

I can't comment on anything >10G due to HW limits.

Sebastian

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