2 ms·

No, TCP ACK has nothing to do with this. All that matters is when the NIC has completed DMA'ing the packet. At that point, userspace can be unblocked. Non-bl

No, TCP ACK has nothing to do with this. All that matters is when the NIC has completed DMA'ing the packet. At that point, userspace can be unblocked. Non-blocking sockets only make sense when there's an intermediate buffer.

mad 16y ago
What happens if you need to retransmit a packet?
- caf 16y ago
  Exactly right. SOCK_STREAM sockets can't unblock the process until it knows that it won't need that buffer again for a retransmission.