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Re: Poor harddrive performance on VM
- To: "xen-users@xxxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxxx>
- From: Paul Leiber <paul@xxxxxxxxxxxxxxxx>
- Date: Sat, 2 Nov 2024 10:54:19 +0100
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Am 02.11.2024 um 10:43 schrieb KAĞAN IŞILDAK:
I tried to install PV drivers on Win10 vm but after xenbus installation
vm stuck on booting phase.
Is PV drivers only solution to solve problem?
Yes, I think you need the PV drivers to increase HD speed.
I faintly remember that the PV driver update process in Windows had some
issues from time to time (it's Windows, after all... :-). I always got
it working without major efforts, though. Unfortunately, I don't
remember the exact steps I took. Some ideas you could try, without
guarantee for success:
- Install the drivers again via Windows Update, reboot, try again if it
fails
- Manually install the drivers (via Windows Device Manager), reboot, try
again if it fails
Paul
On Sat, Nov 2, 2024 at 12:40 Paul Leiber <paul@xxxxxxxxxxxxxxxx
<mailto:paul@xxxxxxxxxxxxxxxx>> wrote:
Am 01.11.2024 um 11:17 schrieb KAĞAN IŞILDAK:
> Hello,
>
> I am using Xen 4.18. My host machine is a Dell server with dual
Intel®
> Xeon® Gold 6438Y+ CPUs and an NVMe SSD. I am working with Windows
> virtual machines and experiencing issues related to hard disk speeds.
Windows DomU means that it is a HVM type of VM.
> So far, I have conducted a total of four tests, covering disk format
> and BIOS firmware. I have tried both QCOW2 and RAW disk formats and
> booted the BIOS as both SeaBIOS and OVMF. In all four tests, my
> read/write speed was around 50 MB/s, which is really low.
>
> What could be causing this issue?
>
> Note: No PV driver is installed, and I have tried mounting the disks
> as both HDA and XVDA, but the results were the same.
IIUC, the PV on HVM drivers are necessary to gain the benefits of
paravirtualization. If there is no frontend PV driver counterpart in
the
DomU for the PV backend on the Dom0, then less efficient software
virtualization happens. [1]
I'd try to install the PV drivers. In my Windows VMs, the Xen PV
devices
have been detected and the Citrix drivers have been installed
automatically by Windows Update.
Paul
[1] https://wiki.xenproject.org/wiki/PV_on_HVM <https://
wiki.xenproject.org/wiki/PV_on_HVM>
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