Quoting Damian Dabrowski (scoot...@gmail.com):
> Hello,
>
> When I mount rbd image with -o queue_depth=1024 I can see much improvement,
> generally on writes(random write improvement from 3k IOPS on standard
> queue_depth to 24k IOPS on queue_depth=1024).
>
> But is there any way to attach rbd disk to KVM instance with custom
> queue_depth? I can't find any information about it.
Not specifically "queue depth", but if you use virtio-scsi, and have a
VM with more than 1 vCPU, you can give each vCPU it's own queue [1]:
<controller type='scsi' index='0' model='virtio-scsi'>
<driver queues='N' />
</controller>
Gr. Stefan
[1]:
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/virtualization_tuning_and_optimization_guide/sect-virtualization_tuning_optimization_guide-blockio-techniques
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