test_sync_write_timeout fails on systems with large `net.core.[rw]mem_default` values

[K900]

serialx/tests/test_sync_transports.py

Line 770 in 5b4fd47

def test_sync_write_timeout(serial_pair: SerialPair) -> None:

On a server system where net.core.[rw]mem_default is raised from the default value, this does not write enough data to the socket to saturate it, making the test fail because the timeout is never hit.

[puddly]

What pair of adapters are you testing with?

[K900]

None, just running the unit tests.

[puddly]

Interesting. Can you post the traceback and the test name? It'll show you what adapter is being used, most likely socat or ser2net or a local TCP server.

[K900]

Sorry, here's the failing tests (slightly snipped):

FAILED tests/test_sync_transports.py::test_sync_write_timeout[SOCAT(extended-posix://)] - Failed: DID NOT RAISE>
FAILED tests/test_sync_transports.py::test_sync_write_timeout[SOCAT] - Failed: DID NOT RAISE <class 'TimeoutErr>
FAILED tests/test_sync_transports.py::test_sync_write_timeout[SOCAT(posix://)] - Failed: DID NOT RAISE

The error is simply because the timeout is never hit, so the error is never raised. Lowering the values with something like sysctl -w net.core.rmem_default=5000 net.core.wmem_default=5000 makes it work.