[ovs-discuss] 答复: For help about ssh between vms through ovs-dkdp

钢锁0310 liw at dtdream.com
Thu May 21 02:55:17 UTC 2015


i add the options 'csum=off,gso=off,guest_tso4=off,guest_tso6=off,guest_ecn=off'
on my guesttx-checksumming: off   that is ok
but 
rx-chechsumming:on [fixed]   it can not to be changed!
Is there some way to be change the 'fixed'?

*********************RTFSC*********************------------------------------------------------------------------发件人:Daniele Di Proietto <diproiettod at vmware.com>发送时间:2015年5月20日(星期三) 23:12收件人:Traynor, Kevin <kevin.traynor at intel.com>抄 送:通天晓0280 <dongj at dtdream.com>,discuss <discuss at openvswitch.org>,钢锁0310 <liw at dtdream.com>主 题:Re: [ovs-discuss] For help about ssh between vms through ovs-dkdpOn 20/05/2015 15:21, "Traynor, Kevin" <kevin.traynor at intel.com> wrote:>>>> -----Original Message----->>> From: Daniele Di Proietto [mailto:diproiettod at vmware.com]>>> Sent: Wednesday, May 20, 2015 1:47 PM>>> To: 钢锁0310>>> Cc: 通天晓0280; discuss; Traynor, Kevin>>> Subject: Re: [ovs-discuss] For help about ssh between vms through>>ovs-dkdp>>> >>> This might be related to offloading features.>>> >>> Could you try again with this qemu "-device" option and let us know?>>> -device>>> >>virtio-net-pci,netdev=net1,csum=off,gso=off,guest_tso4=off,guest_tso6=off>>,g>>> uest_ecn=off>>>>I checked this previously and the DPDK vhost lib will report those>features>>as not available during negotiation so you should be ok with not>specifying>>them explicitly in the qemu cmd line. I haven't tested with qemu 2.3.>>>>> >>> >>> Kevin, do you this we should mention this in INSTALL.DPDk.md?>>>>I had changed the original patch to make it optional in 3a based on>feedback>>from Michael Tsirkin and testing. So unless we find an issue, I'd prefer>to>>leave optional. >>https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_openvswitc>h_ovs_blob_master_INSTALL.DPDK.md-23dpdk-2Dvhost-2Dvm-2Dconfiguration&d=Aw>IGoQ&c=Sqcl0Ez6M0X8aeM67LKIiDJAXVeAw-YihVMNtXt-uEs&r=SmB5nZacmXNq0gKCC1s_C>w5yUNjxgD4v5kJqZ2uWLlE&m=iM-aCjDqF2zfP98Zeafj9Z78WnCYvkzPSyZeV1kVGWg&s=SOm>_egKoAfzUwWioueTrQ9W2sa_WSUwKC74LO5SNvWs&e=>If I don't add the extra options, my guests (Debian wheezy kernel 3.2 andUbuntu 14.04 kernel 3.13, running on QEMU 2.1.3) see these features# ethtool -k eth0Features for eth0:                                                rx-checksumming: off[fixed]                                                tx-checksumming: on        tx-checksum-ipv4: off [fixed]        tx-checksum-unneeded: off [fixed]        tx-checksum-ip-generic: on        tx-checksum-ipv6: off [fixed]        tx-checksum-fcoe-crc: off [fixed]        tx-checksum-sctp: off [fixed]                                                scatter-gather: on        tx-scatter-gather: on        tx-scatter-gather-fraglist: on                                                tcp-segmentation-offload:on        tx-tcp-segmentation: on        tx-tcp-ecn-segmentation: on        tx-tcp6-segmentation: on                                                udp-fragmentation-offload:on                   generic-segmentation-offload: on                                                generic-receive-offload: on                                                large-receive-offload: off[fixed][...]Pings work, but everything else (e.g. DNS lookups) doesn't.To fix the setup I have either to add the extra options or to disable theoffloads (inside the guest) with  ethtool -K eth0 tx off
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