Problem solved.
Using the mount option sync in /etc/fstab on guests is not good for performance if you are using a SSD.
Now used async as mount option and achieving near native performance.
Van: Xen-users <xen-users-bounces@xxxxxxxxxxxxxxxxxxxx> Namens frm@xxxxxxxxxxx
Verzonden: Sunday, 23 December 2018 23:30
Aan: 'Mark Pryor' <tlviewer@xxxxxxxxx>; xen-users@xxxxxxxxxxxxxxxxxxxx; frm@xxxxxxxxxxx
Onderwerp: Re: [Xen-users] Xen performance on guest with LV/SSD very low.
I am on stretch with a self compiled Xen to try to solve the problem.
Did
Make debball
And installed from the generated deb
>dpkg -l | grep -P '^ii|^hi' | grep -P 'qemu|xen' results in
ii grub-xen-bin 2.02~beta3-5+deb9u1 amd64 GRand Unified Bootloader, version 2 (Xen binaries)
ii grub-xen-host 2.02~beta3-5+deb9u1 amd64 GRand Unified Bootloader, version 2 (Xen host version)
ii ipxe-qemu 1.0.0+git-20161027.b991c67-1 all PXE boot firmware - ROM images for qemu
ii qemu-system-common 1:2.8+dfsg-6+deb9u5 amd64 QEMU full system emulation binaries (common files)
ii qemu-utils 1:2.8+dfsg-6+deb9u5 amd64 QEMU utilities
ii xen-upstream 4.11.1 amd64 Xen upstream testing build snapshot
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
The past few days, I have scratched my head regarding very disk IO
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
I tried many things, but I can not find the solution:
OS dom0: 4.18.0-0.bpo.1-amd64
Command line: loglvl=all dom0_mem=2048M dom0_max_vcpus=2 dom0_vcpus_pin
iommu=1 ucode=scan gnttab_max_frames=256
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