From: Pete Heist <pete@heistp.net>
To: "Toke Høiland-Jørgensen via Cake" <cake@lists.bufferbloat.net>
Subject: [Cake] suggest not to use udp with iperf3 versions prior to 3.1.5
Date: Mon, 4 Mar 2019 12:02:49 +0100 [thread overview]
Message-ID: <34B87AFA-F867-4632-BC0F-30E45DE59097@heistp.net> (raw)
Just spent an hour chasing down a strange problem with gradually increasing UDP packet loss with cake (but not fq_codel), which happens when testing with iperf3 3.1.3, but not iperf or irtt. After compiling iperf3 from HEAD, poof, the problem disappeared. It’s not just iperf3’s -l flag as I know it’s default was too high in 3.1.3 and causing fragmentation, but some other UDP handling issue with iperf3.
I still don’t know the reason why it would only happen with cake+iperf3 3.1.3 and not fq_codel+iperf3 3.1.3 (and go away when ‘cake interplanetary’ is used), but I’ll rather leave it alone now and suggest not to use iperf3 < 3.1.5 for UDP...
Pete
reply other threads:[~2019-03-04 11:02 UTC|newest]
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