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RE: [PATCH] Use BPF to distribute packet to different work thread.

September 13, 2020 09:18PM
Hi, Maxim Dounin:
Thanks for your reply, this server is random selected, we just do BPF and no-BPF test, I think the latency based on server configuration, not related with BPF patch, also the NIC
of the server is Mellanox, not ADQ capable hardware , we will do more test
Thanks
LQ

-----Original Message-----
From: nginx-devel <nginx-devel-bounces@nginx.org> On Behalf Of Maxim Dounin
Sent: Monday, September 14, 2020 7:40 AM
To: nginx-devel@nginx.org
Subject: Re: [PATCH] Use BPF to distribute packet to different work thread.

Hello!

On Fri, Sep 11, 2020 at 05:41:47AM +0000, Liu, Qiao wrote:

> Hi, Vladimir Homutov:
> The below is our WRK test result output with BPF enable
>
> 112 threads and 10000 connections
> Thread Stats Avg Stdev Max +/- Stdev
> Latency 608.23ms 820.71ms 10.00s 87.48%
> Connect 16.52ms 54.53ms 1.99s 94.73%
> Delay 153.13ms 182.17ms 2.00s 90.74%
> Req/Sec 244.79 142.32 1.99k 68.40%
> Latency Distribution
> 50.00% 293.50ms
> 75.00% 778.33ms
> 90.00% 1.61s
> 99.00% 3.71s
> 99.90% 7.03s
> 99.99% 8.94s
> Connect Distribution
> 50.00% 1.93ms
> 75.00% 2.85ms
> 90.00% 55.76ms
> 99.00% 229.19ms
> 99.90% 656.79ms
> 99.99% 1.43s
> Delay Distribution
> 50.00% 110.96ms
> 75.00% 193.67ms
> 90.00% 321.77ms
> 99.00% 959.27ms
> 99.90% 1.57s
> 99.99% 1.91s
> Compared with no BPF but enable reuseport as below
>
> 112 threads and 10000 connections
> Thread Stats Avg Stdev Max +/- Stdev
> Latency 680.50ms 943.69ms 10.00s 87.18%
> Connect 58.44ms 238.08ms 2.00s 94.58%
> Delay 158.84ms 256.28ms 2.00s 90.92%
> Req/Sec 244.51 151.00 1.41k 69.67%
> Latency Distribution
> 50.00% 317.61ms
> 75.00% 913.52ms
> 90.00% 1.90s
> 99.00% 4.30s
> 99.90% 6.52s
> 99.99% 8.80s
> Connect Distribution
> 50.00% 1.88ms
> 75.00% 2.21ms
> 90.00% 55.94ms
> 99.00% 1.45s
> 99.90% 1.95s
> 99.99% 2.00s
> Delay Distribution
> 50.00% 73.01ms
> 75.00% 190.40ms
> 90.00% 387.01ms
> 99.00% 1.34s
> 99.90% 1.86s
> 99.99% 1.99s
>
>
> From the above results, there shows almost 20% percent latency
> reduction. P99 latency of BPF is 3.71s , but without BPF is 4.3s.

Thank you for the results.

Given that latency stdev is way higher than the average latency, I don't think the "20% percent latency reduction" observed is statistically significant. Please try running several tests and use ministat(1) to check the results.

Also, the latency values look very high, and request rate very low. What's on the server side?

--
Maxim Dounin
http://mdounin.ru/
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