Messages in this thread |  | | Subject | Re: REGRESSION BISECTED: mq-deadline: covert to use request_queue->async_depth | | From | "Yu Kuai" <> | | Date | Sat, 11 Apr 2026 00:21:04 +0800 |
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Hi,
在 2026/4/10 13:18, Doug Smythies 写道: >> Do you ever use the async_depth for mq-deadline? > No.
Then the only difference is the tag wake batch is changed from 1 to 8. However, batch wake up is the base design of sbitmap. And I do admit tail latency is bad under high concurrency is probably due to wake up is unfair, this is a know sbitmap design flaw and not fixed yet.
You could try change wake up batch back to 1. However, I don't think this is a good solution. And I'll suggest you to try increase nr_requests to see if tail latency gets better.
Per
-- Thansk, Kuai
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