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

[Mark Pryor <tlviewer@xxxxxxxxx>]

It appears you are on Stretch with a self-built xen-4.11.

Can you clarify if you have used `make debball` and installed from a *.deb?

and check that no remnants of a distro install are still present:
>dpkg -l | grep -P '^ii|^hi' | grep -P 'qemu|xen'

thanks,

PryMar56
##xen-packaging on Freenode IRC

On Sunday, December 23, 2018, 12:09:55 PM PST, <frm@xxxxxxxxxxx> wrote:

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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