On Fri, 2018-08-03 at 00:58 +-0800, Ming Lei wrote: +AD4- And about the situations you mentioned, no any special as normal cases +AD4- or thousands of LUNs. Just a batch of queues are waken up from one +AD4- single wait queue(sbq+AF8-wait+AF8-state), and inside each wait queue, queues +AD4- are handled actually in FIFO order. +AD4- +AD4- Or what is your expected ideal behaviour about fairness? Hello Ming, What I expect is if the number of LUNs is really large that all LUNs are treated equally. Unless someone can set up a test that demonstrates that this is still the case for commit 97889f9ac24f (+ACI-blk-mq: remove synchronize+AF8-rcu() from blk+AF8-mq+AF8-del+AF8-queue+AF8-tag+AF8-set()+ACI-), I will assume that that commit breaks fairness. Bart.
