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Surprising terminal typing latency #3657

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ammario opened this issue Aug 24, 2022 · 3 comments
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Surprising terminal typing latency #3657

ammario opened this issue Aug 24, 2022 · 3 comments
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@ammario
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ammario commented Aug 24, 2022 •
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I used feeltty to measure the interactivity of a Coder SSH session vs. SSH directly into the box.

Coder is substantially slower in our coder-ts (Docker-based) template. I get baseline latencies in my AWS workspace.

$ feeltty ssh coder.poll
connect              2990.36792ms
input sample size    32
input mean           118.698ms
input stddev         274.132ms

$ feeltty ssh <redacted>
connect              1199.80383ms
input sample size    32
input mean           55.526ms
input stddev         43.138ms

Oddly, I see equal throughputs as tested by ssh <host> -- cat /dev/urandom | pv > /dev/null.

Perhaps #3505 will fix this. (cc @kylecarbs, @bpmct)
@ammario ammario added the bug label Aug 24, 2022
@bpmct
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bpmct commented Aug 30, 2022

I tried with identical workspaces (aws, us-west-1, same instance type). To me, it does not seem like a significant improvement.

no tailscale

coder@ben-stable:~/coder/dist$ feeltty ssh coder.no-tailscale
connect              2527.55540ms
input sample size    32
input mean           85.401ms
input stddev         0.452ms

with tailscale

(I used client and server binaries from #3505)

coder@ben-stable:~/coder/dist$ feeltty ssh coder.with-tailscale
connect              3022.32316ms
input sample size    32
input mean           104.875ms
input stddev         0.392ms

@ammario ammario added this to the EE milestone Aug 31, 2022
@BrunoQuaresma
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cc.: @kylecarbs

@kylecarbs
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Closing in favor of #2779

@kylecarbs kylecarbs closed this as not planned Won't fix, can't repro, duplicate, stale Sep 7, 2022
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@BrunoQuaresma @kylecarbs @ammario @bpmct