Hi Matt, thanks for your report, personally I experienced issues with offloading in nic drivers, by default the recommended option is disable this, to keep these parameters as permanent please enter your command in the script /usr/local/zenloadbalancer/config/zlb-start in your favorite language. This script will be executed after the zen process start concludes.
Regards 2015-08-02 15:15 GMT+02:00 Mathieu Chateau <mathieu.chat...@lotp.fr>: > Hello, > > I have a weird behavior and found solution that may interest others > > Context: > > - All servers are VM under VMware ESXi 5.5, even ZLB > - All VM having VMXnet 3 virtual nic > > issue: > When doing L4xnat, With one frontend server, badnwidth is terribly slow. > It's FTP service that is used. I am the only one, copying 1 big file. > > As soon as I start, ZLB keep sending ICMP packets to the FTP server: > 14:45:54.829302 IP ZLBIPADDR > FTPSERVER: ICMP > prd-sta-slb01.intern.mobistep.net unreachable - need to frag (mtu 1500), > length 556 > > I checked everywhere, MTU is 1500. > > Now If I put the second FTP server, which is even accross a vpn, then no > ICMP, and great bandwidth (11MB/s instead of 40KB/s) > > > These 2 FTP servers are also Web server, load balancer through the same > ZLB as web farm, not a single ICMP message. > > After digging with Wireshark, yes the slow one is sending packet bigger > than MTU. This server is on same vswitch as ZLB internal card. > > It appeard that VMware nic do offloading and so then bigger packet than > MTU. > > Everything is ok as soon as I disable TCP offloading on FTP server: > > *ethtool -K ens160 tx off sg off tso off* > > Maybe someone have a better config on ZLB to avoid that? > > > Regards, > Mathieu CHATEAU > http://www.lotp.fr > > > ------------------------------------------------------------------------------ > > _______________________________________________ > Zenloadbalancer-support mailing list > Zenloadbalancer-support@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/zenloadbalancer-support > > -- Load balancer distribution - Open Source Project http://www.zenloadbalancer.com Distribution list (subscribe): zenloadbalancer-support@lists.sourceforge.net
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