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Date:      Sun, 15 Jan 2012 20:56:14 -0800
From:      Kevin Oberman <kob6558@gmail.com>
To:        "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net>
Cc:        ml-freebsd-stable Stable <freebsd-stable@freebsd.org>, Steven Hartland <killing@multiplay.co.uk>
Subject:   Re: HPN-SSH question
Message-ID:  <CAN6yY1u%2BHzxVhtMDWyHbZegeJssoycYTZWtwKdv_UM9F=bRb6A@mail.gmail.com>
In-Reply-To: <1196DEC9-2AEE-4F9A-8521-EFA8513D6003@lists.zabbadoz.net>
References:  <9728B37F7A4EBE45A2FD4B18883BAED6D02612@SN2PRD0802MB111.namprd08.prod.outlook.com> <BE96C8EC5CEB4411BAA45D9A5882CDAB@multiplay.co.uk> <A6AFCC97-74FE-4B9E-8B9E-B245909D944E@lists.zabbadoz.net> <40A76FC1992140AFA5B8EB52C28DB3A1@multiplay.co.uk> <1196DEC9-2AEE-4F9A-8521-EFA8513D6003@lists.zabbadoz.net>

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On Sun, Jan 15, 2012 at 10:58 AM, Bjoern A. Zeeb <
bzeeb-lists@lists.zabbadoz.net> wrote:

> On 15. Jan 2012, at 16:28 , Steven Hartland wrote:
>
> > Yep we installed openssh-portable + HPN and experienced noticeably
> > reduced transfer rates on high latency links, exactly the opposite
> > as one would expect. I don't have the exact figures I'm afraid as
> > we just went straight back to standard ssh.
> >
> > I'll try and get some time to retest and provide some proper
> > results.
>
> Thanks. If you do please try the bundled version in 8-STABLE or 9 and
> also gather the usual meta data (latency, packet loss, IPv4/v6, any
> socket buffer tuning, ...).
>

And, if it happens with 9, any chance of a tcpdump capture of all of the
headers for analysis? (No packet data needed.) We use the HPN version
extensively on high latency links (often trans-oceanic) and have never seen
that.  I'd find running tcptrace and generating time plots very useful for
looking at this sort of performance issue.
-- 
R. Kevin Oberman, Network Engineer
E-mail: kob6558@gmail.com



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