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Martin,

On 9/15/20 07:37, Martin Grigorov wrote:
> I am running some load tests on Tomcat and I've noticed that when
> HTTP2 is enabled the throughput drops considerably.
>
> Here are the steps to reproduce:
>
> 1) Enable HTTP2, e.g. by commenting out this connector:
> https://github.com/apache/tomcat/blob/d381d87005fa89d1f19d9091c0954f31
7c135d9d/conf/server.xml#L103-L112
>
>  2) Download Vegeta load tool from:
> https://github.com/tsenart/vegeta/releases/
>
> 3) Run the load tests:
>
> 3.1) HTTP/1.1 echo -e '{"method": "GET", "url":
> "http://localhost:8080/examples/"}' | vegeta attack -format=json
> -rate=0 -max-workers=1000 -duration=10s | vegeta encode >
> /tmp/http1.json; and vegeta report -type=json /tmp/http1.json | jq
> .
>
> 3.2) HTTP2 echo -e '{"method": "GET", "url":
> "https://localhost:8443/examples/"}' | vegeta attack -format=json
> -http2 -rate=0 -max-workers=1000 -insecure -duration=10s | vegeta
> encode > /tmp/http2.json; and vegeta report -type=json
> /tmp/http2.json | jq .

You are using HTTP with 1.1 and HTTPS with h2. Maybe you are seeing
CPU slowdown for the (probably double encryption) taking place on the
same host?

- -chris
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