Am 18.12.23 um 15:49 schrieb Paolo Bonzini:
> On Mon, Dec 18, 2023 at 1:41 PM Fiona Ebner <f.eb...@proxmox.com> wrote:
>> I think it's because of nested drains, because when additionally
>> checking that the drain count is zero and only executing the loop then,
>> that issue doesn't seem to manifest
>
> But isn't virtio_scsi_drained_end only run if bus->drain_count == 0?
>
> if (bus->drain_count-- == 1) {
> trace_scsi_bus_drained_end(bus, sdev);
> if (bus->info->drained_end) {
> bus->info->drained_end(bus);
> }
> }
>
You're right. Sorry, I must've messed up my testing yesterday :(
Sometimes the CPU spikes are very short-lived. Now I see the same issue
with both variants.
Unfortunately, I haven't been able to figure out why it happens yet.
Best Regards,
Fiona
