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#1 2025-08-30 06:32:28

somboku
Member
Registered: 2025-08-30
Posts: 3

ssh lags

Hello Guys,

I've got a strange behavior here. On a fresh installed Arch and I have massive lags from my Mint machine via ssh.
Login is via ssh_key - no problem. But when I write on the console - the Arch machine is in my LAN - there are lags.

So I fired up tcpdump.
And there are dozent (~100) of lines with these just by pressing one key:

06:16:00.563956 IP 10.0.0.147.41132 > 10.0.0.198.22: Flags [P.], seq 67908:67944, ack 82063, win 1225, options [nop,nop,TS val 420468524 ecr 2269267690], length 36
06:16:00.564237 IP 10.0.0.198.22 > 10.0.0.147.41132: Flags [P.], seq 82063:82099, ack 67944, win 120, options [nop,nop,TS val 2269267710 ecr 420468524], length 36

sometimes there is a:

06:15:59.935765 IP 10.0.0.147.41132 > 10.0.0.198.22: Flags [.], ack 80911, win 1203, options [nop,nop,TS val 420467896 ecr 2269267074], length 0

Logging in from another machine there are just 3 lines (by pressing one key).
I've also tried with a different user and without any ssh_keys.

I know this is not really an arch failure. But the fact that I have this only on the arch machine with my Mint, makes me headaches.

Does anybody have any ideas?
Thanks
S.

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#2 2025-08-30 07:25:06

seth
Member
From: Don't DM me only for attention
Registered: 2012-09-03
Posts: 69,056

Re: ssh lags

Do you use the same terminal emulator on all clients? Do you have such lags when logging in from a linux console? (The arch host might simply lack the terminfo for the client TE, not all are part of ncurses)

For clarification:
There're no problem w/ other ssh clients (how many - round about) to that concerned arch server and there're also no problem w/ the concerned Mint client to various other ssh servers?

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#3 2025-08-31 01:49:56

somboku
Member
Registered: 2025-08-30
Posts: 3

Re: ssh lags

seth wrote:

Do you use the same terminal emulator on all clients? Do you have such lags when logging in from a linux console? (The arch host might simply lack the terminfo for the client TE, not all are part of ncurses)

Well, no. And now I've tried putty - on my machine. So the lag is still there BUT: now tcpdump show just a regular "conversation" (4 lines) by pressing 1 key.
So what does putty different as my terminals (mate or gnome)
But anyway the lag is there.. so I dont know. I mean I can fireup some rdp - with much more data, and a simple typing on the remote shell laggs?

For clarification:
There're no problem w/ other ssh clients (how many - round about) to that concerned arch server and there're also no problem w/ the concerned Mint client to various other ssh servers?

No, and no

Thanks anyways
S.

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#4 2025-08-31 06:53:13

seth
Member
From: Don't DM me only for attention
Registered: 2012-09-03
Posts: 69,056

Re: ssh lags

So what does putty different as my terminals (mate or gnome)

Repaints? The lag could be strictly local.
Have you tried the behavior when being logged in from a console (the DOS-like, no GUI thing you get when pressing ctrl+alt+f3)

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#5 2025-09-01 19:32:06

somboku
Member
Registered: 2025-08-30
Posts: 3

Re: ssh lags

seth wrote:

So what does putty different as my terminals (mate or gnome)

Repaints? The lag could be strictly local.
Have you tried the behavior when being logged in from a console (the DOS-like, no GUI thing you get when pressing ctrl+alt+f3)

well, thanks ok, no lags.
But again how to see, why the f*** is it sending ~100 lines by typing just 1 key.

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#6 2025-09-01 20:01:36

seth
Member
From: Don't DM me only for attention
Registered: 2012-09-03
Posts: 69,056

Re: ssh lags

Do you use the same terminal emulator on all clients?

Well, no. And now I've tried putty - on my machine. … now tcpdump show just … (4 lines) by pressing 1 key.

What TE are you currently using on Mint and does the arch system have the terminfo for that?
Have you tried using eg. xterm?

As for the lags: what DE do you run on Mint? Cinnabun? XFCE?

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