From owner-freebsd-current@freebsd.org Sat Jan 23 17:15:38 2016 Return-Path: Delivered-To: freebsd-current@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 41952A8EBBA; Sat, 23 Jan 2016 17:15:38 +0000 (UTC) (envelope-from kob6558@gmail.com) Received: from mail-ob0-x22e.google.com (mail-ob0-x22e.google.com [IPv6:2607:f8b0:4003:c01::22e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 0690313B6; Sat, 23 Jan 2016 17:15:38 +0000 (UTC) (envelope-from kob6558@gmail.com) Received: by mail-ob0-x22e.google.com with SMTP id yo10so61677394obb.2; Sat, 23 Jan 2016 09:15:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=te6EBV6lvTesJvqPRwk1a299/rFdFg3WK4O9b1y/RI8=; b=AuBXXbKimsmhs7EIPkfqX0UJwvaw4Gj4I97YKGbTH8G2dozZB0xjhhKxk/rTx/90xO CFqbg4WNNeO3haC2cSSwQdU+SRqAgr3bPgFrQ2o89+GZ2A2vjGlzDy2eB9VJZ4alNU2M eu/TePVFuXKmdqP5a8qY9Hkr4j6FcgMnHM9BraBMSNdjx0aHKi4ABgBuAJXA5nX3JTbD 45Y83pqR50QVdouv0zGFPUBmXr+U4bXERBxMWZOcuksxgMttpyXbxk+xCt0+yZGcY84g eN8Qa/N5ZTMcXK/VdwounlyPpdZY33pHFAT6dcnFt0srkbXMrhpqZTYw83f3BKBj2EXj wQcA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:sender:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=te6EBV6lvTesJvqPRwk1a299/rFdFg3WK4O9b1y/RI8=; b=WyAet1D6tmMxG2vYxMQ37IaC4fgRAiuSLUq0ATZ1+WSVXbhzOu6bHnfrAot+m+YvZe 1YpGpEsPq7XPO2BW0oBsGZNLQGPtbGTEQuAhSu0c9Cx5eP0Uq30IwGzLTM44fILS1Ebj SUXcmibPX8ljqUxeZ2vlxb6+PELYhcIjGCfTYEzvvUQN80vsWvBTQHQNSgK8t+Ao10EA o35giv+sdLdWklPIiIwo3yG5xzxMSzdmr5obLw9GVELCe9WlqepVeDXpjt8xbYHDiDDc DAcH3izhPoU9JvKDnf9A9ZvulCMMzXuKGWCJ/B3AX42qPXVY6RnPFFexwgy/i77XCcvJ ExTQ== X-Gm-Message-State: AG10YOS5hPZ8MvcHlCuKyE5VHv9LEUvzJZqhWrl+sNHZ7DtBdUGvGFPnfBNYqvj91Yx+rQ5l5AhN38bGkkUeXQ== MIME-Version: 1.0 X-Received: by 10.182.254.34 with SMTP id af2mr7432415obd.60.1453569337032; Sat, 23 Jan 2016 09:15:37 -0800 (PST) Sender: kob6558@gmail.com Received: by 10.202.98.131 with HTTP; Sat, 23 Jan 2016 09:15:36 -0800 (PST) In-Reply-To: <861t98e1el.fsf@desk.des.no> References: <86mvrxvg79.fsf@desk.des.no> <56A2DE54.6070603@freebsd.org> <861t98e1el.fsf@desk.des.no> Date: Sat, 23 Jan 2016 09:15:36 -0800 X-Google-Sender-Auth: YcJCvY639XWh9rYNm2-jkt97KFs Message-ID: Subject: Re: HPN and None options in OpenSSH From: Kevin Oberman To: =?UTF-8?Q?Dag=2DErling_Sm=C3=B8rgrav?= Cc: Julian Elischer , FreeBSD Current , FreeBSD-STABLE Mailing List , freebsd-security@freebsd.org Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.20 X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 23 Jan 2016 17:15:38 -0000 On Sat, Jan 23, 2016 at 7:55 AM, Dag-Erling Sm=C3=B8rgrav wrot= e: > Julian Elischer writes: > > what is the internal window size in the new ssh? > > 64 kB. > > DES > -- > Dag-Erling Sm=C3=B8rgrav - des@des.no Are you sure of this? I have not looked at the code, but my former colleagues at the high performance research network ESnet claim at http://fasterdata.es.net/data-transfer-tools/say-no-to-scp/ that the internal buffers and effective window size have recently been increased from 64KB to 1MB an allow for transfer rates of up to 140 Mbps over a link with 53 ms. latency. With the HPN patches, they report 1.2 Gbps, making HPN patches still significant over high latency paths. That said, scp still performed poorly when compared to other technologies (i.e. GridFTP) for bulk data transfer over high-latency high-bandwidth links. (ESnet provides links of up to 400 Gbps between the US and Europe as well as within the US, so this sort of thing is quite important to them.) -- Kevin Oberman, Part time kid herder and retired Network Engineer E-mail: rkoberman@gmail.com PGP Fingerprint: D03FB98AFA78E3B78C1694B318AB39EF1B055683