[pve-devel] [PATCH qemu-server] vm start: set minimum timeout of 300s if using PCI passthrough

[Friedrich Weber]

On 21/08/2023 10:33, Fiona Ebner wrote:
> Would it make sense to instead add a constant multiplier to the memory
> timeout heuristic in presence of PCI passthrough? The user says 65 GiB
> takes about 3 min 30 s, so assuming it's more or less linear, the 5 min
> from this patch would not be enough for more than ~130 GiB of memory.

You're right, a heuristic makes more sense here than a constant
multiplier. I'll give it a try in the next version.

>> Notes:
>>     An alternative workaround is offered by an unapplied patch series [3]
>>     of bug #3502 [2] that makes it possible to set VM-specific timeouts
>>     (also in the GUI). Users could use this option to manually set a
>>     higher timeout for VMs that use PCI passthrough. However, it is not
>>     immediately obvious that a higher timeout is necessary. Since the
>>     problem seems to come up somewhat frequently, I think it makes sense
>>     to have the heuristic choose a higher timeout by default.
>>     
>>     [2]: https://bugzilla.proxmox.com/show_bug.cgi?id=3502
>>     [3]: https://lists.proxmox.com/pipermail/pve-devel/2023-January/055352.html
> 
> Yes, I think having both the better heuristic and the configurable
> timeout makes sense. Since Daniel left, do you want to have another look
> at the series/pick it up?

Sure! When I'm back from vacation, I'll send another version of this
patch series and also take a look at Daniel's old patch series. I'll
probably send them separately though, as they are somewhat independent.