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Windows 11 KVM guest IO Performance

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  Windows 11 KVM guest IO Performance basti <mailinglist@unix-solution.de> - 2024-11-28 13:10 +0100
    Re: Windows 11 KVM guest IO Performance basti <mailinglist@unix-solution.de> - 2024-11-28 13:40 +0100
      Re: Windows 11 KVM guest IO Performance Linux-Fan <Ma_Sys.ma@web.de> - 2024-12-08 20:30 +0100

#274954 — Windows 11 KVM guest IO Performance

Hello,

I have move a Win10 KVM guest to new hardware and than upgrade this 
guest to Windows 11.

KVM Host Hardware is:

- 2x Xeon E5-2697A v4
- 128GB RAM
- 4x SAMSUNG MZ7LM1T9HCJM as raid 10

KVM Guest:

4x qemu64 CPU (1 Socket/ 4 Core/ 1 Threads)
8GB RAM
No graphic tablet
No Ballon driver

When I copy a big file (~8GB) from Network to local I get 1 GBit/s speed.

When I run to install RSAT tools or ClearMgr I only see 10-25 MB/s in 
iostat on the KVM host.

Any ideas or suggestions?

Best Regards

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#274956

The disk use Virtio driver with no buffer and unmap.


Am 28.11.24 um 13:01 schrieb basti:
> Hello,
> 
> I have move a Win10 KVM guest to new hardware and than upgrade this 
> guest to Windows 11.
> 
> KVM Host Hardware is:
> 
> - 2x Xeon E5-2697A v4
> - 128GB RAM
> - 4x SAMSUNG MZ7LM1T9HCJM as raid 10
> 
> KVM Guest:
> 
> 4x qemu64 CPU (1 Socket/ 4 Core/ 1 Threads)
> 8GB RAM
> No graphic tablet
> No Ballon driver
> 
> When I copy a big file (~8GB) from Network to local I get 1 GBit/s speed.
> 
> When I run to install RSAT tools or ClearMgr I only see 10-25 MB/s in 
> iostat on the KVM host.
> 
> Any ideas or suggestions?
> 
> Best Regards
> 

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#275413

[Multipart message — attachments visible in raw view] — view raw

basti writes:

> Am 28.11.24 um 13:01 schrieb basti:
>> I have move a Win10 KVM guest to new hardware and than upgrade this guest to  
>> Windows 11.

[..]

>> 4x qemu64 CPU (1 Socket/ 4 Core/ 1 Threads)
>> 8GB RAM
>> No graphic tablet
>> No Ballon driver
>>
>> When I copy a big file (~8GB) from Network to local I get 1 GBit/s speed.
>>
>> When I run to install RSAT tools or ClearMgr I only see 10-25 MB/s in iostat  
>> on the KVM host.
>>
>> Any ideas or suggestions?
>
> The disk use Virtio driver with no buffer and unmap.

Three ideas:

 1. Check the status of the virtual drive from Windows point of view:
    Open the “Optimize Drives” application and verify that the
    Media type equals “Thin provisioned device” (it should say that).

 2. `qemu64` may be an inadquate choice of CPU.
    See <https://www.berrange.com/posts/2018/06/29/cpu-model-configuration-for-qemu-kvm-on-x86-hosts/>
    for some ideas about what to chose instaed. Note that it may
    cause issues with Windows Activation i.e. if you don't have
    the necessary data at hand, maybe don't just change it on a
    whim.

 3. Does the VM behave notably slower than a comparable reference
    system?`I am asking because IMHO it may very well be a reasonable
    IO throughput for a Windows OS and maybe there is nothing out of
    the ordinary I/O-wise here?

    For comparison, I ran the `cleanmgr` and deleted about 4 GiB of
    files from my Windows 11 VM just now and it never exceeded ~9 MiB/s
    (measuring in 10sec intervals I got 90 MiB/interval)
    on the host averaging much below.

HTH
Linux-Fan

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