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Maxim Dounin

September 13, 2020 07:40PM

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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Subject	Author	Views	Posted
[PATCH] Use BPF to distribute packet to different work thread.	liuqiao	1398	September 10, 2020 01:24AM
Re: [PATCH] Use BPF to distribute packet to different work thread.	Vladimir Homutov	328	September 10, 2020 06:14AM
RE: [PATCH] Use BPF to distribute packet to different work thread.	liuqiao	475	September 11, 2020 01:44AM
Re: [PATCH] Use BPF to distribute packet to different work thread.	Maxim Konovalov	327	September 13, 2020 05:04AM
RE: [PATCH] Use BPF to distribute packet to different work thread.	liuqiao	530	September 13, 2020 09:22PM
Re: [PATCH] Use BPF to distribute packet to different work thread.	Maxim Dounin	336	September 13, 2020 07:40PM
RE: [PATCH] Use BPF to distribute packet to different work thread.	liuqiao	564	September 13, 2020 09:18PM
RE: [PATCH] Use BPF to distribute packet to different work thread.	liuqiao	482	September 14, 2020 10:10PM
Re: [PATCH] Use BPF to distribute packet to different work thread.	Mikhail Isachenkov	357	September 21, 2020 07:30AM
RE: [PATCH] Use BPF to distribute packet to different work thread.	liuqiao	532	September 23, 2020 09:00PM
RE: [PATCH] Use BPF to distribute packet to different work thread.	liuqiao	423	November 16, 2020 07:36PM
Re: [PATCH] Use BPF to distribute packet to different work thread.	Mikhail Isachenkov	315	November 17, 2020 04:10AM
RE: [PATCH] Use BPF to distribute packet to different work thread.	liuqiao	442	November 18, 2020 02:18AM
Re: [PATCH] Use BPF to distribute packet to different work thread.	Martin Grigorov	305	November 19, 2020 02:30AM
RE: [PATCH] Use BPF to distribute packet to different work thread.	liuqiao	545	November 19, 2020 03:10AM

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