Installation guide

37.5. Verifying t he para-virt ualized drivers have successfully loaded

One of the first tasks you will want to do is to verify that the drivers have actually been loaded into

your system.

After the para-virtualized drivers have been installed and the guest has been rebooted you can verify

that the drivers have loaded. First you should confirm the drivers have logged their loading into

/var/log/messages

# grep -E "vif|vbd|xen" /var/log/messages

xen_mem: Initialising balloon driver

vif vif-0: 2 parsing device/vif/0/mac

vbd vbd-768: 19 xlvbd_add at /local/domain/0/backend/vbd/21/76

xen-vbd: registered block device major 202

You can also use the lsmod command to list the loaded para-virtualized drivers. It should output a

list containing the xen_vnif, xen_vbd, xen_platform_pci and xen_balloon modules.

# lsmod|grep xen

xen_vbd 19168 1

xen_vnif 28416 0

xen_balloon 15256 1 xen_vnif

xen_platform_pci 98520 3 xen_vbd,xen_vnif,xen_balloon,[permanent]

37.6. T he syst em has limit ed t hroughput wit h para-virt ualized drivers

If network throughput is still limited even after installing the para-virtualized drivers and you have

confirmed they are loaded correctly (see Section 37.5, “ Verifying the para-virtualized drivers have

successfully loaded” ). To fix this problem, remove the 'type=ioemu' part of 'vif=' line in your

guest's configuration file.

⁠Chapt er 37 . T roubleshoot ing t he Xen para- virt ualized drivers

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