Why there is no response using git protocol to clone project?

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I try to clone a Linux branch from git://git.kernel.org to local machine:

# git clone git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux -b perf/core
Cloning into 'linux'...

But there is no response. Use the tcpdump and Wireshark to check the captured packets:
enter image description here We can see the TCP connection was established. But after client sent request using git smart protocol, there was no any response.

Could anyone give some clues?

Update:
(1) According to @MariaInesParnisari suggestion, using --verbose flag, but it doesn't show more information:

# git clone git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux -b perf/core --verbose
Cloning into 'linux'...
Looking up git.kernel.org ... done.
Connecting to git.kernel.org (port 9418) ... 147.75.110.187 done.

(2) Change to https protocol, it worked:

# git clone https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux -b perf/core --verbose
Cloning into 'linux'...
POST git-upload-pack (gzip 25015 to 12570 bytes)
remote: Counting objects: 5287534, done.
remote: Compressing objects: 100% (807310/807310), done.
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