rbd kernel block driver memory usage

[Stefan Hajnoczi <stefanha@xxxxxxxxxx>]

Hi,
What sort of memory usage is expected under heavy I/O to an rbd block
device with O_DIRECT?

For example:
- Page cache: none (O_DIRECT)
- Socket snd/rcv buffers: yes
- Internal rbd buffers?

I am trying to understand how similar Linux rbd block devices behave
compared to local block device memory consumption (like NVMe PCI).

Thanks,
Stefan

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