Date: Mon, 16 Jan 2012 06:58:52 +0000 From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: Kevin Oberman <kob6558@gmail.com> Cc: Steven Hartland <killing@multiplay.co.uk>, ml-freebsd-stable Stable <freebsd-stable@freebsd.org> Subject: Re: HPN-SSH question Message-ID: <E26E9D94-B45E-4C40-93F7-D1FDDB6A774A@lists.zabbadoz.net> In-Reply-To: <CAN6yY1u%2BHzxVhtMDWyHbZegeJssoycYTZWtwKdv_UM9F=bRb6A@mail.gmail.com> 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> <CAN6yY1u%2BHzxVhtMDWyHbZegeJssoycYTZWtwKdv_UM9F=bRb6A@mail.gmail.com>
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On 16. Jan 2012, at 04:56 , Kevin Oberman wrote: > 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. Or using siftr. /bz -- Bjoern A. Zeeb You have to have visions! It does not matter how good you are. It matters what good you do!
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