Messages in this thread | | | Date | Mon, 7 Nov 2022 15:56:01 -0500 | From | Stefan Hajnoczi <> | Subject | Re: [PATCHSET v3 0/5] Add support for epoll min_wait |
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Hi Jens, NICs and storage controllers have interrupt mitigation/coalescing mechanisms that are similar.
NVMe has an Aggregation Time (timeout) and an Aggregation Threshold (counter) value. When a completion occurs, the device waits until the timeout or until the completion counter value is reached.
If I've read the code correctly, min_wait is computed at the beginning of epoll_wait(2). NVMe's Aggregation Time is computed from the first completion.
It makes me wonder which approach is more useful for applications. With the Aggregation Time approach applications can control how much extra latency is added. What do you think about that approach?
Stefan [unhandled content-type:application/pgp-signature] | |