Messages in this thread | | | Subject | Re: [PATCH] blk-mq: allow hardware queue to get more tag while sharing a tag set | From | Bart Van Assche <> | Date | Sat, 31 Jul 2021 10:15:14 -0700 |
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On 7/11/21 8:18 PM, Yu Kuai wrote: > If there are multiple active queues while sharing a tag set, it's not > necessary to limit the available tags as same share for each active queue > if no one ever failed to get driver tag. And fall back to same share if > someone do failed to get driver tag. > > This modification will be beneficial if total queue_depth of disks > on the same host is less than total tags.
This patch adds new atomic operations in the hot path and hence probably has a negative performance impact. What is the performance impact of this patch for e.g. null_blk when submitting I/O from all CPU cores?
Thanks,
Bart.
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