From owner-freebsd-fs@freebsd.org Thu Nov 1 01:46:42 2018 Return-Path: Delivered-To: freebsd-fs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 6489910DC6D5; Thu, 1 Nov 2018 01:46:42 +0000 (UTC) (envelope-from avv314@gmail.com) Received: from mail-lf1-x12b.google.com (mail-lf1-x12b.google.com [IPv6:2a00:1450:4864:20::12b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id CCDFD7723A; Thu, 1 Nov 2018 01:46:41 +0000 (UTC) (envelope-from avv314@gmail.com) Received: by mail-lf1-x12b.google.com with SMTP id n3-v6so13115951lfe.7; Wed, 31 Oct 2018 18:46:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=8Jhwbm7kdrIBbWgP9UbP7r5BTcHsIlc7DP09ghEcGZA=; b=WFB6mqm1o1ujrgswAIfS4S0qnA8pZP3fCVXBN0KTvI2ZssoOAPuIkD/oBwpy6XZEMY kRCI+rSHANx2jTFnDWkNmqjcvTnmLr8zZ3ujCD72h4/yoktsXQgl+Wdxb1DytaS3nlFN aNxINAeTNQperi5JK2RvUrQMq+CRshyMeCH4h1eGWuPqi2lM/V4pGtQsPUAtBfWQ/Aye +8YKFoZxeqmKB914aci7NTrmI8ndjeSOvvG1UHypTqp2g+Ftqm3yjlsXDrfPXI5BUbWI POz3gpGkPH6tqvDFgw5rRJXODAZXnc/9bXZG5MdLyuxu6/K1tZH9uozP4fmV26gbX3hG GPAA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=8Jhwbm7kdrIBbWgP9UbP7r5BTcHsIlc7DP09ghEcGZA=; b=ph1dCUjUzTyKvxBgsxjy5qwLFbtzDM6v+avoK4cyQ7julBbSFUuv+7hlkex7wL8Lov jT0TSl+iW0jhFI7v+XlwA8TAy9qigtxQ1V7veybVJfdiakX276hYSncn7RbtbKxae+V9 eHOvkAtpuUE4spKqeIbatqhmWM/5wyNNz4aDUUIkr4BIbWNRcdm9+DxWmo3jt9sEA0fS QiqS8oMnIza9LHgvMTX6zSYZJl3ZL+c4z1bdv03qYtJ1zc7eLoYevJqU0gJ796qSIb+s 6pwBjrTv5ojJg7dnmpSWS9bOP/8vIHtQwDucvlwYBS7KYg6hEiwVDS8/YD1AnyAj+qbb 5kIA== X-Gm-Message-State: AGRZ1gK03gnPzI9/FBQsfIemxhFhJg8t5tb5AmCO05jXHT5iui0qMc2X CoqWrTy2Nh8RFzgQFxN/1D3T7qMzBga6GKvD26M= X-Google-Smtp-Source: AJdET5cqwOqSaY9mGe2n8T+BGKqrJX69m24iYN6LYk3eK1XvOSXkzerQmTfvERCIp3Da0uy4an5Xd+6HubtnUdMEs0o= X-Received: by 2002:a19:a84e:: with SMTP id r75mr3063086lfe.18.1541036800224; Wed, 31 Oct 2018 18:46:40 -0700 (PDT) MIME-Version: 1.0 References: <201810291506.w9TF6YAP057202@pdx.rh.CN85.dnsmgr.net> In-Reply-To: From: Andrew Vylegzhanin Date: Thu, 1 Nov 2018 04:46:28 +0300 Message-ID: Subject: Re: NFS + Infiniband problem To: rmacklem@uoguelph.ca Cc: "Rodney W. Grimes" , freebsd-fs@freebsd.org, freebsd-infiniband@freebsd.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.29 X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Nov 2018 01:46:42 -0000 =D1=87=D1=82, 1 =D0=BD=D0=BE=D1=8F=D0=B1. 2018 =D0=B3. =D0=B2 3:27, Rick Ma= cklem : > >Also need to test setup with infniband set from connected mode to datagram mode. > Are you using IPv6 by any chance? No, I don't. > Why I ask is that there was a problem with IPv6 fragmentation re-assembly. If > InfiniBand is using a larger MTU than the ethernet, the switch would probably > fragment the IP datagram. If any fragment is lost (or fragmentation re-assembly > is broken), it isn't going to work well. > "netstat -s | fgrep "fragments dropped after" [root@nas1 ~]# netstat -s | fgrep "fragments dropped after" 0 fragments dropped after timeout 0 fragments dropped after timeout > will show you the count of fragments dropped after timeout. If this value is > increasing, then fragmentation re-assembly is an issue. (Check on the receiving > end. The server for writes.) > > You might want to post on freebsd-net@, since someone there might know more > about InfiniBand (and someone over there will definitely know about the IPv6 > fragmentation problem. I'm cc'ed to freebsd-infiniband@ also, but silence. > > rick -- Andrew