CLI results 2x higher RTT

[metalefty]

Hi,

I've noticed that CLI result 2x higher RTT than web speed test.

Here's my web speed test result: https://librespeed.org/results/?id=17vfzh3

I performed a speed test using cli, strangely, it shows 2x higher RTT than web test.

% librespeed-cli --server 6
Retrieving LibreSpeed.org server list
Selected server: Nuremberg, Germany (1) (Hetzner) [de1.backend.librespeed.org]
Sponsored by: Snopyta @ https://snopyta.org
You're testing from: 2405:6586:2280:1200::dead:beef - Asahi Net, JP (9080 km)
Ping: 535 ms    Jitter: 0 ms
Download rate:  5.82 Mbps
Upload rate:    2.22 Mbps

I also measured RTT using ping, the result is same as the web test.

% ping6 de1.backend.librespeed.org
PING6(56=40+8+8 bytes) 2405:6586:2280:1200::dead:beef --> 2a01:4f8:1c1c:93d6::1
16 bytes from 2a01:4f8:1c1c:93d6::1, icmp_seq=0 hlim=35 time=268.486 ms
16 bytes from 2a01:4f8:1c1c:93d6::1, icmp_seq=1 hlim=35 time=266.626 ms
16 bytes from 2a01:4f8:1c1c:93d6::1, icmp_seq=2 hlim=35 time=264.742 ms
16 bytes from 2a01:4f8:1c1c:93d6::1, icmp_seq=3 hlim=35 time=264.809 ms

I haven't dig up the code but I guess you forgot to divide some value by 2.

Best Regards,

[maddie]

Thanks for your report.

The ping RTT avg. shouldn't need to divide by 2, and this is the first time I've seen this issue, so I have some doubts about this problem, would you please:

1. Ping the server via IPv4 and see the ping times
2. Check lsof or the likes to see if the CLI is indeed making requests via IPv6

Thanks!

[metalefty]

Hi,

I forgot to mention the client version. I'm using v1.0.6. The RTT is exactly 2x than the actual value so I guess something's miscalculated.

Same result with IPv4 and I confirmed the CLI is making IPv6 requests using wireshark.

% librespeed-cli --server 6 -4
Retrieving LibreSpeed.org server list
Selected server: Nuremberg, Germany (1) (Hetzner) [de1.backend.librespeed.org]
Sponsored by: Snopyta @ https://snopyta.org
You're testing from: 131.129.*.* - Asahi Net, JP (9070 km)
Ping: 539 ms    Jitter: 0 ms
Download rate:  4.85 Mbps
Upload rate:    2.54 Mbps

% ping de1.backend.librespeed.org
PING de1.backend.librespeed.snopyta.org (195.201.88.76): 56 data bytes
64 bytes from 195.201.88.76: icmp_seq=0 ttl=43 time=276.318 ms
64 bytes from 195.201.88.76: icmp_seq=1 ttl=43 time=271.564 ms
64 bytes from 195.201.88.76: icmp_seq=2 ttl=43 time=268.954 ms
64 bytes from 195.201.88.76: icmp_seq=3 ttl=43 time=274.501 ms
64 bytes from 195.201.88.76: icmp_seq=4 ttl=43 time=275.595 ms

[metalefty]

I performed further tests with the server near to me, I still have around 2x results.

IPv4

% librespeed-cli --server-json http://w.vmeta.jp/temp/inonius.json --server 0 -4
Retrieving LibreSpeed.org server list
Selected server: IPv4 inonius [ipv4.inonius.net]
You're testing from: 131.129.* * - Asahi Net, JP (880 km)
Ping: 56 ms     Jitter: 1 ms
Download rate:  82.99 Mbps
Upload rate:    86.94 Mbps

% ping ipv4.inonius.net
PING ipv4.inonius.net (210.231.212.23): 56 data bytes
64 bytes from 210.231.212.23: icmp_seq=0 ttl=49 time=22.148 ms
64 bytes from 210.231.212.23: icmp_seq=1 ttl=49 time=21.424 ms
64 bytes from 210.231.212.23: icmp_seq=2 ttl=49 time=21.553 ms

IPv6

% librespeed-cli --server-json http://w.vmeta.jp/temp/inonius.json --server 1 -6
Retrieving LibreSpeed.org server list
Selected server: IPv6 inonius [ipv6.inonius.net]
You're testing from: 2405:6586:2280:1200::dead:beef - Asahi Net, JP (860 km)
Ping: 45 ms     Jitter: 0 ms
Download rate:  90.51 Mbps
Upload rate:    87.96 Mbps

% ping6 ipv6.inonius.net
PING6(56=40+8+8 bytes) 2405:6586:2280:1200::dead:beef --> 2405:f000:202:2598::23
16 bytes from 2405:f000:202:2598::23, icmp_seq=0 hlim=47 time=23.105 ms
16 bytes from 2405:f000:202:2598::23, icmp_seq=1 hlim=47 time=26.648 ms
16 bytes from 2405:f000:202:2598::23, icmp_seq=2 hlim=47 time=25.591 ms
16 bytes from 2405:f000:202:2598::23, icmp_seq=3 hlim=47 time=28.247 ms
16 bytes from 2405:f000:202:2598::23, icmp_seq=4 hlim=47 time=25.655 ms

[maddie]

I can't reproduce this issue, what system are you running on?

Here's my result:

$ librespeed-cli
Retrieving LibreSpeed.org server list
Selecting the fastest server based on ping
Selected server: Strasbourg, France (Host Europe) [sxb.bandspeed.de]
You're testing from: redacted
Ping: 194 ms	Jitter: 1 ms
Download rate:	26.34 Mbps
Upload rate:	7.97 Mbps

$ ping sxb.bandspeed.de
PING sxb.bandspeed.de (62.75.137.44): 56 data bytes
64 bytes from 62.75.137.44: icmp_seq=0 ttl=46 time=191.868 ms
64 bytes from 62.75.137.44: icmp_seq=1 ttl=46 time=192.739 ms
64 bytes from 62.75.137.44: icmp_seq=2 ttl=46 time=253.609 ms
64 bytes from 62.75.137.44: icmp_seq=3 ttl=46 time=196.641 ms
64 bytes from 62.75.137.44: icmp_seq=4 ttl=47 time=192.959 ms
64 bytes from 62.75.137.44: icmp_seq=5 ttl=46 time=192.934 ms
64 bytes from 62.75.137.44: icmp_seq=6 ttl=46 time=193.358 ms
^C
--- sxb.bandspeed.de ping statistics ---
7 packets transmitted, 7 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 191.868/202.015/253.609/21.109 ms

[metalefty]

On FreeBSD, it 100% reproduces. I will also test it on Linux later.

[maddie]

Any feedback? If not, I'll close this issue due to inactivity later.

[metalefty]

I haven't figure out the root cause of this issue but the issue is 100% reproducible. Please don't close the issue about existing bug.

[natzlob]

I have also experienced for high speeds (Gbit ethernet) to a self-hosted server, the throughput on cli is approximately half of what it shows on the web FE version. I would assume this is linked?