On Tue, 17 Jan 2023 11:42:15 +0000, Pavel Begunkov wrote:
> When there are no read queues read requests will be assigned a
> default queue on allocation. However, blk_mq_get_cached_request() is not
> prepared for that and will fail all attempts to grab read requests from
> the cache. Worst case it doubles the number of requests allocated,
> roughly half of which will be returned by blk_mq_free_plug_rqs().
>
> It only affects batched allocations and so is io_uring specific.
> For reference, QD8 t/io_uring benchmark improves by 20-35%.
>
> [...]
Applied, thanks!
[1/1] block: fix hctx checks for batch allocation
(no commit info)
Best regards,
--
Jens Axboe
