Date: Thu, 12 May 2011 12:02:25 -0300 From: "Tobias P. Santos" <tobias@ntelecom.com.br> To: freebsd-xen@freebsd.org Subject: Re: [FreeBSD 8.2 amd64 XENHVM] DomU terrible network performance trought NAT Message-ID: <4DCBF681.7070106@ntelecom.com.br> In-Reply-To: <4DCBEEE0.9060705@steadinet.fr> References: <4DCBEEE0.9060705@steadinet.fr>
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Try this: ifconfig xn1 -txcsum Best regards, Tobias. Laurent Cligny wrote: > Hello all, > > I want to setup a FreeBSD DomU VM as a network NAT gateway in order to > provide Internet access to other FreeBSD and Linux DomU VMs. > My Dom0 is Xen Cloud Platform 1.0 on a Dell Poweredge 210 with 8 cores, > 16GiB RAM and one NIC. > > All FreeBSD VM are 8.2 amd64 with XENHVM kernel anf the Linux VM is a > Paravirtualized Debian amd64. > > The NAT gateway is a two-NIC box, with one (xn0) configured with a > public Internet address and the other (xn1) configured with a class A > private address (10.0.0.254). > The Internet traffic is very good from my FreeBSD NAT gateway to the > Internet (~ 50MiB/s) and also between other VMs on the private network > (~ 70MiB/s trough scp) after applying the patch here > (http://www.mail-archive.com/freebsd-xen@freebsd.org/msg00855.html) > fixing the "too many frags" problem. > > Here is a schema of my setup with the observed net speed on it: > > ---------- --------------- ---------------------- > |Internet|---xn0---|FBSD DomU NAT|---xn1---|FBSD and Linux DomUs| > ---------- --------------- ---------------------- > <-------> <-------> > 50MiB/s 70MiB/s > > <-------------------------------> > 0KiB/s <network speed< 5 KiB/s > > [...]
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