Date: Mon, 24 Aug 2015 15:09:31 -0700 From: Chris Stankevitz <chrisstankevitz@gmail.com> To: freebsd-questions <freebsd-questions@freebsd.org> Subject: openssh with HPN patches over a high BDP link Message-ID: <CAPi0pssHnnwtt2xeMqkCQoATd6RpdQtBrm8txF5YpYCOESm%2BXg@mail.gmail.com>
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I use ssh over a high-BDP WAN link (BDP=1MByte). tcpdump shows I am TCP window limited with a max bytes-in-flight of ~64 KBytes (too small). I am using the command "# cat /dev/urandom | ssh root@host 'cat > /dev/null'" Q: Is it true that FreeBSD's base openssh is built with the HPN ssh patches? (I believe it is true given changelogs and references in sshd_config) Q: If HPN is indeed enabled, can anyone explain my abysmally small TCP window? Over the same link with iperf the window opens at ~30 KBytes/sec until it reaches ~500 KBytes Thank you, Chris
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