Date: Wed, 18 May 2011 14:24:26 +0200 From: "laurent.cligny@gmail.com" <laurent.cligny@gmail.com> To: freebsd-xen@freebsd.org Subject: Re: [FreeBSD 8.2 amd64 XENHVM] DomU terrible network performance trought NAT Message-ID: <4DD3BA7A.7040504@gmail.com> In-Reply-To: <4DCC2564.8090002@ntelecom.com.br> References: <4DCBEEE0.9060705@steadinet.fr> <4DCBF681.7070106@ntelecom.com.br> <4DCC1097.4080003@gmail.com> <4DCC2564.8090002@ntelecom.com.br>
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Le 12/05/2011 20:22, Tobias P. Santos a écrit : > laurent.cligny@gmail.com wrote: >> Le 12/05/2011 17:02, Tobias P. Santos a écrit : >> >>> Try this: >>> >>> ifconfig xn1 -txcsum >>> >>> Best regards, >>> Tobias. >>> >> Hello Tobias, >> >> Unfortunately ifconfig xn1 -txcsum didn't give me lot of result. >> Doing this my network perf through NAT is about 7KiB/s (that is better >> than before, but still unworkable). >> >> Thanks for the idea, maybe we are not that far away from the solution. >> >> > We had a problem where traffic between VMs was too slow (about 5Mbps > on a Gigabit network) and disabling TX checksum solved the problem > (actually, speed increased to more than 1Gbps). > Your problem is different as you have a nice throughput between VMs on > xn1, sorry that I missed that on my first message. > > Did you try to transfer data from something connected to xn0 to one of > yours DomU servers connected to xn1 without NAT? > You also mentioned pf. Did you make any test using natd or anything else? > Something tells me that's not a nic problem, but that's just a guess. I already tried setup with natd, as I found on the list archives that PF can pose problems with XENHVM kernels, but the network perfomance was the same. > > Anyway, on the coming weeks I will have to set up a similar > environment to yours, so maybe I'll face the same problem (although we > use natd daemon instead of pf). > > Good luck! I think I will keep my Linux PV VM to do NAT, as it is the only thing on my Xen setup that cause problems for now. With that I will still be able to work with FreeBSD for the backend servers. > > _______________________________________________ > freebsd-xen@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-xen > To unsubscribe, send any mail to "freebsd-xen-unsubscribe@freebsd.org"
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