Re: [PATCH 2/3] blk-mq: Always complete remote completions requests in softirq

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On 12/4/20 12:13 PM, Sebastian Andrzej Siewior wrote:
> Controllers with multiple queues have their IRQ-handelers pinned to a
> CPU. The core shouldn't need to complete the request on a remote CPU.
> 
> Remove this case and always raise the softirq to complete the request.

I don't like this one at all, it'll add a softirq jump for the fast path
for eg nvme devices. Did you run any performance testing with this? I
can give it a spin, will do so anyway, but was curious if anything but
"this still works" testing was done.

-- 
Jens Axboe




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