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

Mikhail Isachenkov
September 21, 2020 07:30AM
Hi Liu Qiao,

We've testing early version patch with same BPF code (on AWS cloud,
without ADQ-capable cards) on relatively small payloads and found no
significant difference. We'd like to retest it with large payload size;
could you please elaborate a bit more how you did perform the test?
I mean 'nginx -T' output, number of CPU cores and CPU model, test
scripts, 1-megabyte file and any system tuning parameters. One of
caveats was that wrk may produce significant client load and most
effective way to distribute client load between CPU cores is running wrk
in one thread via taskset.

Another big caveat that I've found during my test is the strange
behavior of this BPF code: when client and server runs on the same
server, all requests was served by one nginx worker process. Did you try
to run wrk and nginx locally in your test?

Thanks in advance!

15.09.2020 05:08, Liu, Qiao пишет:
> Below is 5 times test result compare, 112 threads, 10000 connections, 1M object http request. Seems P99 have great improvement, and Max is also reduced
>
>
>
> AVG Stdev Max P99
> test 1 1.32s 447.09ms 5.48s 2.82s
> BPF test 2 1.39s 513.8ms 9.42s 3.1s
> test 3 1.4s 341.38ms 5.63s 2.55s
> test 4 1.41s 407.45ms 6.96s 2.77s
> test 5 1.29s 644.81ms 9.45s 3.74s
> Average 1.362s 470.906ms 7.388s 2.996s
>
> NonBPF test 1 1.48s 916.88ms 9.44s 5.08s
> test 2 1.43s 658.48ms 9.54s 3.92s
> test 3 1.41s 650.38ms 8.63s 3.59s
> test 4 1.29s 1010ms 10s 5.21s
> test 5 1.31s 875.01ms 9.53s 4.39s
> Average 1.384s 822.15ms 9.428s 4.438s
>
>
> Thanks
> LQ
> -----Original Message-----
> From: nginx-devel <nginx-devel-bounces@nginx.org> On Behalf Of Liu, Qiao
> Sent: Monday, September 14, 2020 9:18 AM
> To: nginx-devel@nginx.org
> Subject: RE: [PATCH] Use BPF to distribute packet to different work thread.
>
> 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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>

--
Best regards,
Mikhail Isachenkov
NGINX Professional Services
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Subject Author Views Posted

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

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