[Xen-users] Xen performance on guest with LV/SSD very low.

[<frm@xxxxxxxxxxx>]

Hi,

The past few days, I have scratched my head regarding very disk IO
performance on Xen.
I have installed KVM on the same machine, same result: very low disk IO.

With iozone on Dom0 I easily 180 MB/s, in a pv guest only 2MB/s. The Dom0 is
90 times faster.
I tried many things, but I can not find the solution:

OS dom0: 4.18.0-0.bpo.1-amd64
Xen: 4.11.1

Command line: loglvl=all dom0_mem=2048M dom0_max_vcpus=2 dom0_vcpus_pin
iommu=1 ucode=scan gnttab_max_frames=256

Guest:
OS: 4.18.0-0.bpo.1-amd64
lsmod | grep blk
xen_blkfront           40960  1

What am Ii missing here?

Thanks,

-- Jaap


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