On 08/07/2014 11:11, Bart Van Assche wrote:
e might each be referring to different concepts here. What you are referring to is average response time for QD > 1. What I was referring to is average response time for QD = 1. The measurements I ran with fio have shown that the response time for QD = 1 is lower when processing completions in interrupt context compared to processing interrupts in softirq context.
I see, but wait, I had few arguments... among them the fact that the vast majority if not the entire set of networking drivers live well with this CS to softirqD over-head also for their ping-ping (~ QD=1) latency tests and their latency is ~3x small vs block drivers.
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