[ofa-general] Re: [Bug 508] IPoIB CM multicast is hogging interrupts

[Michael S. Tsirkin]

> Quoting Roland Dreier <rdreier at cisco.com>:
> Subject: Re: [Bug 508] IPoIB CM multicast is hogging interrupts
> 
>  > This seems to hurt top bandwidth a bit in my testing, so this needs some more
>  > work. Meanwhile, Scott, could you please check whether the following
>  > patch helps in your test-case?
> 
> The common CQ helped bandwidth, right?  What's the advantage of this approach?

Unfortunately, further testing demonstrated a problem with the common CQ
approach: when an error is discovered on some TX QP, I can't just stop using
that TX and immediately re-enable the interface as I currently do: I have to
wait until I get all completions with error or until the QP is reset to get rid
of outstanding completions, and this might (and does) take a long time since
this all involves slow path operations.

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MST