Re: [PATCH] net/mlx5: poll completion queue once per a call

On Jul 27, 2017, at 4:12 AM, Sagi Grimberg [off-list ref] wrote:

quoted

quoted

Yes I realize that, but can't the device still complete in a burst (of
unsuppressed completions)? I mean its not guaranteed that for every
txq_complete a signaled completion is pending right? What happens if
the device has inconsistent completion pacing? Can't the sw grow a
batch of completions if txq_complete will process a single completion
unconditionally?

Speculation. First of all, device doesn't delay completion notifications for no
reason. ASIC is not a SW running on top of a OS.

I'm sorry but this statement is not correct. It might be correct in a
lab environment, but in practice, there are lots of things that can
affect the device timing.

Disagree.

[...]

Reviewed-by: Sagi Grimberg <sagi@grimberg.me>

Thanks for ack!

Yongseok