i use default TCP params and change tcp_conn_wq_max and tcp_wq_max can help of course according to if statement.

q->queued is zero in my fail test, so it is strange for me.
in docs

tcp_conn_wq_max
Maximum bytes queued for write allowed per connection. Attempting to queue more bytes would result in an error and in the connection being closed (too slow). If tcp_write_buf is not enabled, it has no effect.

So i try to add the last 700k and it is failed always. I undestand this paramenter as not yet sent data (connection too slow), so if q->queued<tcp_conn_wq_max, then connection is fast and i can add more data to queue

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