Terrible performance of XenServer 6.2 and FreeBSD 10.0-RELEASE guest

[Mark Felder]

Is all this work being done over SSH? Do you have a pf firewall? Have you disabled TSO?

ifconfig xn0 -tso

or

sysctl net.inet.tcp.tso=0


My suspicion is that the slowness of the shell over the network is making the machine seem slower than it should be. There are terrible network issues with pf and tso on a XenServer environment. I'm not otherwise aware of severe I/O issues on XenServer. I have a fairly large cluster running almost all FreeBSD guests without any sort of issues related to I/O.