Re: [pve-devel] [PATCH v3 manager 1/2] HDEdit: check iothread by default and move it from advanced section

[Matthias Heiserer <m.heiserer@proxmox.com>]

On 18.05.2022 11:40, Fabian Ebner wrote:
> Am 12.05.22 um 11:24 schrieb Matthias Heiserer:
>> Existing disks are not changed by this.
>> Especially in benchmarks, iothreads significantly improve IO performance.
>>
>>
>> Signed-off-by: Matthias Heiserer <m.heiserer@proxmox.com>
>> ---
>>
>> Changes from v2:
>> * also check iothread when adding a disk to an existing VM and
>>   scsi single
>> * use bind instead of hardcoded true
> 
> This feels like to much automagic to me, because changes to the checkbox
> (even if checkbox is for a virtio disk) will change the controller type
> and vice versa. This also makes it impossible to only set iothread on
> certain disks or use the "Virtio SCSI single" controller type without
> setting iothread.
> 
> Is it possible to instead have the checkbox be invalid with an
> appropriate error for the user when it's a bad configuration?

Changes to the checkbox already change the Controller to Virtio SCSI 
(single), regardless of what was selected before. Anyways, the automatic 
change only happens in the wizard.

In case that a user wants iothread with a controller other than SCSI 
single or on a single disk, they can change that in the VM config, but I 
don't think that this is a common problem, at least much less common 
than wanting iothread enabled per default.

But I guess we can show a warning instead.