Description of problem: according with this changeset http://xenbits.xensource.com/xen-unstable.hg?rev/dadadf9aeee7 I am able to limit the speed of domU networking, but for me is not working domU config kernel = "/boot/Kernel-xenU" ramdisk = "/boot/initrd-ext3-xenU" memory = 2048 name = "emerson" disk = [ 'phy:/dev/VolGroup00/emerson_root,xvda1,w', 'phy:/dev/VolGroup00/emerson_swap,xvda2,w'] root = "/dev/xvda1" extra = "ro selinux=0 3 console=/dev/xvc0 " vif = ['mac=00:16:3e:36:5b:a1, vifname=emerson, rate=128KB/s'] on_poweroff = 'restart' on_reboot = 'restart' on_crash = 'restart' #on_poweroff = 'destroy' vif section of xm list --long (device (vif (uuid aac1b1bb-ac66-d06d-96f1-f3da0cf360a4) (script vif-bridge) (rate 128KB/s) (mac 00:16:3e:36:5b:a1) (vifname emerson) (backend 0) ) ) after this I am still able to push 5-10mb/s on domU Version-Release number of selected component (if applicable): kernel-xen-2.6.21-2954.fc8 (64bits) xen-libs-3.1.2-1.fc8 (64bits) xen-3.1.2-1.fc8 (64bits)
why the domU networking is not limited to 128KB/s rate ?
FYI, our Xen maintenance team is 100% focused on porting Xen kernels to 2.6.24 + paravirt_ops. This short-term intensive effort unfortunately means we do not have resources to deeply investigate kernel bugs such as this ticket, in the legacy F7/F8 kernel-xen. That said, if anyone can identify patches that will solve this bug we certainly look at applying them in an update. Otherwise I'd recommend trying out a combination of 'tc' and 'iptables' to perform traffic shaping per-guest in the host networking stack.
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