I think it was on ZLB but not on front end servers. Maybe I could also resolve this issue if enabling it also on ZLB (and so activated everywhere)
Cordialement, Mathieu CHATEAU http://www.lotp.fr 2015-08-03 17:11 GMT+02:00 Emilio Campos <emilio.campos.mar...@gmail.com>: > 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 > > > ------------------------------------------------------------------------------ > > _______________________________________________ > Zenloadbalancer-support mailing list > Zenloadbalancer-support@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/zenloadbalancer-support > >
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