Re: [PATCH rfc 0/5] generic adaptive IRQ moderation library for I/O devices

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Hi Tal,

I think Tal has idea/s on how the existing library can be changed to
support more modes/models

What I was thinking is allowing DIM algorithm to disregard data which is 0. Currently if bytes == 0 we return "SAME" immediately. We can change it to simply move to the packets check (which may be renamed to "completions"). This way you could use DIM while only optimizing to (P1) high packet rate and (P2) low interrupt rate.

That was exactly where I started from. But unfortunately it did not work
well :(

From my experiments, the moderation was all over the place failing to
converge. At least the workloads that I've tested with, it was more
successful to have a stricter step policy and pulling towards latency
if we are consistently catching single completion per event.

I'm not an expert here at all, but at this point, based on my attempts
so far, I'm not convinced the current net_dim scheme could work.
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