Re: [pve-devel] [PATCH qemu-server v8 4/7] feature #1027: virtio-fs support

[Fiona Ebner <f.ebner@proxmox.com>]

Am 13.02.24 um 12:52 schrieb Markus Frank:
> Thanks,
> 
> I already moved most of the code into a new PVE/QemuServer/Virtiofs.pm
> module.
> 

Great! :)

> Just an clarification & question concerning the queue-size:
> 
> On  2024-01-31 16:02, Fiona Ebner wrote:
>>> +    push @$devices, '-chardev',
>>> "socket,id=virtfs$i,path=/var/run/virtiofsd/vm$vmid-fs$i";
>>> +    push @$devices, '-device', 'vhost-user-fs-pci,queue-size=1024'
>>
>> Any specific reason for queue-size=1024? Better performance than the
>> default 128?
> 
> There was problem with Windows Guests:
> https://bugzilla.redhat.com/show_bug.cgi?id=1873088
> https://github.com/virtio-win/kvm-guest-drivers-windows/issues/764
> 
> queue-size=1024 is still in every documentation and every qemu command
> for virtiofs I have seen used 1024.

Good to know! Please add a comment referencing this, so people looking
at the code will be aware of it and why the value was chosen.

> Would it better to add a parameter to configure this queue-size?

We can add a parameter if enough users with valid use cases request it.
But to start out, I don't see much need for it.