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nixos/kubo: increase maximum UDP send buffer size

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In addition to increasing the maximum UDP receive buffer size in the Linux kernel, it is now recommended to do the same for the send buffer size.
This is documented in https://github.com/quic-go/quic-go/wiki/UDP-Buffer-Sizes.
The change to the documentation was made in June: 5b5e58d289.

Without this change, the Kubo daemon will output this warning:
```
failed to sufficiently increase send buffer size (was: 208 kiB, wanted: 2048 kiB, got: 416 kiB). See https://github.com/quic-go/quic-go/wiki/UDP-Buffer-Sizes for details.
```
This can be seen while running the NixOS tests.
This commit is contained in:
Luflosi 2023-12-04 16:18:32 +01:00
parent 2b97055f53
commit b2f8b846f2
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1 changed files with 2 additions and 1 deletions
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nixos/modules/services/network-filesystems/kubo.nix
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@ -282,8 +282,9 @@ in
environment.systemPackages = [ cfg.package ];
environment.variables.IPFS_PATH = fakeKuboRepo;
# https://github.com/lucas-clemente/quic-go/wiki/UDP-Receive-Buffer-Size
# https://github.com/quic-go/quic-go/wiki/UDP-Buffer-Sizes
boot.kernel.sysctl."net.core.rmem_max" = mkDefault 2500000;
boot.kernel.sysctl."net.core.wmem_max" = mkDefault 2500000;
programs.fuse = mkIf cfg.autoMount {
userAllowOther = true;