When I'm running interactive ssh session which is ControlMaster and I run scp or sftp to same host, creating another channel, it seems that ssh is stuffing the packets together exceeding MTU. I've for years ran QoS where I prioritize small packets, as it is clean and easy way to guarantee low latency to pretty much all you care for. Unfortunately ControlMaster packet stuffing breaks this, my interactive packets are not small anymore for the duration of scp/sftp and receive best effort treatment making my interactive session extremely laggy. Is there particular need to combine interactive packets with MTU sized data packets? In what type of situation is the current behaviour desired? Thanks, -- ++ytti
> When I'm running interactive ssh session which is ControlMaster and I run scp > or sftp to same host, creating another channel, it seems that ssh is stuffing > the packets together exceeding MTU.It seems likely that I got confused by looking tshark, seeing box sending bigger packets than MTU, but that was likely due to XEN NIC offering large-segment-offload. So this may be expected behaviour with no obvious workaround, other than not using ControlMaster when doing both interactive and sftp/scp to same host. -- ++ytti
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