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jeamland icodein littlebenlittle

async-tun's Issues

Flushing write buffer sometimes takes a long time

Hello!

Im having issues with your library and I traced it down to flushing buffers and was wondering if you had advice.

I set up a virtual machine and have tunnels created between my machine and the VM. I can ping through the interface with varying levels of success. Tracking down the issue it seems flushing the buffer can sometimes take 10-60 seconds, followed by a few flushes taking milliseconds, then another taking a long time. I don't think bandwidth is a problem since I'm sending a small amount of data (100's of bytes) once a second.

I did an strace and sometimes see errors but nothing seems consistent with the long delay. Here are two examples where the flush had a long wait (not all have errors).

futex(0x55cd2389a2d8, FUTEX_WAIT_PRIVATE, 0, NULL) = ? ERESTARTSYS (To be restarted if SA_RESTART is set)
--- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} ---
futex(0x55cd2389a2d8, FUTEX_WAIT_PRIVATE, 0, NULL) = 0
futex(0x55cd23899ec0, FUTEX_WAKE_PRIVATE, 1) = 0
lseek(11, -48, SEEK_CUR)                = -1 ESPIPE (Illegal seek)
futex(0x7f6364000ce8, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7f6364003600, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7f6364000ce8, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7f6364003600, FUTEX_WAKE_PRIVATE, 1) = 1
...
futex(0x55cd2389a2d8, FUTEX_WAIT_PRIVATE, 0, NULL) = 0
futex(0x55cd23899ec0, FUTEX_WAKE_PRIVATE, 1) = 0
lseek(11, -48, SEEK_CUR)                = -1 ESPIPE (Illegal seek)
futex(0x7f6364000ce8, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7f6364003600, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7f6364000ce8, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7f6364003600, FUTEX_WAKE_PRIVATE, 1) = 1

I have also seen this behavior between two physical machines.

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