go/net/ssh: improve throughput by more than 100x

Use concurrent writes (this is safe for our usage) and use
ReadFromWithConcurrency to extract maximum concurrency from the process.

Increase the window to 1024 pending reqeuests for a bandwidth-delay
product of 32MiB, sufficient for ~1Gbps at 300ms RTT.

In practice this improves upload performance from ~13Mbit/s on 15ms RTT
up to over 1.5Gbit/s, now being limited by the weak network
implementation on the small GCP instance I tested this on. Maximum
performance with a bigger instance and <1ms RTT was over 5Gbps, becoming
disk-limited.

Change-Id: I2f08d2c815fd15794f497ed9dc7a7f8a2e351992
Reviewed-on: https://review.monogon.dev/c/monogon/+/3435
Tested-by: Jenkins CI
Reviewed-by: Tim Windelschmidt <tim@monogon.tech>
1 file changed
tree: 6e3c355798c5b8113fb44ed790ba6e9d58ad82a7
  1. .github/
  2. build/
  3. cloud/
  4. go/
  5. intellij/
  6. metropolis/
  7. osbase/
  8. third_party/
  9. tools/
  10. version/
  11. .bazelignore
  12. .bazelproject
  13. .bazelrc
  14. .bazelrc.ci
  15. .bazelrc.sandboxroot
  16. .bazelversion
  17. .git-ignore-revs
  18. .gitignore
  19. BUILD.bazel
  20. CODING_STANDARDS.md
  21. go.mod
  22. go.sum
  23. LICENSE
  24. MODULE.bazel
  25. MODULE.bazel.lock
  26. README.md
  27. SETUP.md
  28. shell.nix
  29. WORKSPACE
README.md

Monogon Monorepo

This is the main repository containing the source code for the Monogon Platform.

This is pre-release software - take a look, and check back later! In the meantime, join us on Matrix (#monogon-os-community:matrix.org) or Discord.

Environment

Our build environment is self-contained and requires only minimal host dependencies:

  • A Linux machine or VM.
  • Bazelisk >= v1.15.0 (or a working Nix environment).
  • A reasonably recent kernel with user namespaces enabled.
  • Working KVM with access to /dev/kvm (if you want to run tests).

Our docs assume that Bazelisk is available as bazel on your PATH.

Refer to SETUP.md for detailed instructions.

Monogon OS

The source code lives in //metropolis (Metropolis is the codename of Monogon OS).

See the //metropolis/README.md for a developer quick start guide, or see the Monogon OS Handbook for user documentation.