From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ding Tianhong Subject: Re: [RFC] Is it a bug for nfs on udp6 mode or kernel? Date: Thu, 14 Apr 2016 08:59:19 +0800 Message-ID: <570EEB67.4020404@huawei.com> References: <570E2D69.7080102@huawei.com> <1460564226.10638.28.camel@edumazet-glaptop3.roam.corp.google.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: , , Netdev , "linux-kernel@vger.kernel.org" , , , To: Eric Dumazet Return-path: Received: from szxga01-in.huawei.com ([58.251.152.64]:26550 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751210AbcDNBBv (ORCPT ); Wed, 13 Apr 2016 21:01:51 -0400 In-Reply-To: <1460564226.10638.28.camel@edumazet-glaptop3.roam.corp.google.com> Sender: netdev-owner@vger.kernel.org List-ID: On 2016/4/14 0:17, Eric Dumazet wrote: > On Wed, 2016-04-13 at 19:28 +0800, Ding Tianhong wrote: >> Hi everyone: >> >> I have met this problem when I try to test udp6 for nfs connection, = my environment is: >> >> Server: >> kernel: 4.1.15 >> IP:xxxx::36/64 >> MTU:1500 >> Setting: /etc/exports:/home/nfs *(rw,sync,no_subtree_check,no_root_s= quash) >> >> Client: >> kernel: 4.1.18 >> IP:xxxx::90/64 >> MTU:1500 >> command: mount -t nfs -o vers=3D3,proto=3Dudp6,rsize=3D4096,wsize=3D= 4096 [xxxx::36]:/home/nfs /home/tmp >> >> I check the nfs parameter configuration, it looks fine and could wor= k well for proto=3Dtcp6. >> >> Then I have mount correctly and try to run the command "ls", it hang= =2E >> >> When I use the rsize=3D1024 and wsize=3D1024 to mount, the problem d= isappeared, so I guess it is the problem for GSO or GRO for UDP=E3=80=82 >> >> Then I try to debug the problem, first I tcpdump the package from cl= ine to server, and found that >> the client have send readdirplus message to server correctly, and th= en the Server send a 4k package >> to client(the big package will frag to 4 package by GSO), till now i= t looks fine, and the Client Nic could >> receive the 4 skb then send to upper stack to ipv6 and udp, I found = the incoming 4 package has been merged >> to one and send to upper stack just like sunrpc, but I try to open t= he rpc_debug, it looks that the rpc could >> not receive message. >> >> >> I built a simple demo to test the udp stack, use the client socket t= o send big package to server socket, it work well, >> so I think the udp is fine, maybe the bug is in sunrpc. >> >> The test is very simple, does any body met the same problem like me,= thanks for any suggestion. >> >> Ding=20 >=20 > Have you tried to disable UFO ? >=20 > ethtool -K eth... ufo off >=20 >=20 Hi Eric: Already disabled, my nic don't support UFO. Thanks. Ding >=20 > . >=20