From: Keith Busch <keith.busch@intel.com>
To: Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org, linux-nvme@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCHSET v3 0/16] blk-mq: Add support for multiple queue maps
Date: Tue, 30 Oct 2018 12:35:39 -0600 [thread overview]
Message-ID: <20181030183538.GB19483@localhost.localdomain> (raw)
In-Reply-To: <20181030183252.17857-1-axboe@kernel.dk>
On Tue, Oct 30, 2018 at 12:32:36PM -0600, Jens Axboe wrote:
> This series adds support for multiple queue maps for blk-mq.
> Since blk-mq was introduced, it's only support a single queue
> map. This means you can have 1 set of queues, and the mapping
> purely depends on what CPU an IO originated from. With this
> patch set, drivers can implement mappings that depend on both
> CPU and request type - and they can have multiple sets of mappings.
>
> NVMe is used as a proof of concept. It adds support for a separate
> write queue set. One way to use this would be to limit the number
> of write queues to favor reads, since NVMe does round-robin service
> of queues. An easy extension of this would be to add multiple
> sets of queues, for prioritized IO.
>
> NVMe also uses this feature to finally make the polling work
> efficiently, without triggering interrupts. This both increases
> performance (and decreases latency), at a lower system load. At
> the same time it's more flexible, as you don't have to worry about
> IRQ coalescing and redirection to avoid interrupts disturbing the
> workload. This is how polling should have worked from day 1.
>
> This is on top of my mq-conversions branch. It can also be bound
> in my mq-maps branch.
Looks good to me. For the series:
Reviewed-by: Keith Busch <keith.busch@intel.com>
prev parent reply other threads:[~2018-10-30 18:38 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-30 18:32 [PATCHSET v3 0/16] blk-mq: Add support for multiple queue maps Jens Axboe
2018-10-30 18:32 ` [PATCH 01/16] blk-mq: kill q->mq_map Jens Axboe
2018-10-31 0:28 ` Sagi Grimberg
2018-10-30 18:32 ` [PATCH 02/16] blk-mq: abstract out queue map Jens Axboe
2018-10-31 0:31 ` Sagi Grimberg
2018-10-31 14:17 ` Jens Axboe
2018-10-30 18:32 ` [PATCH 03/16] blk-mq: provide dummy blk_mq_map_queue_type() helper Jens Axboe
2018-10-31 0:32 ` Sagi Grimberg
2018-10-30 18:32 ` [PATCH 04/16] blk-mq: pass in request/bio flags to queue mapping Jens Axboe
2018-10-31 0:37 ` Sagi Grimberg
2018-10-31 14:18 ` Jens Axboe
2018-10-30 18:32 ` [PATCH 05/16] blk-mq: allow software queue to map to multiple hardware queues Jens Axboe
2018-10-31 0:49 ` Sagi Grimberg
2018-10-31 14:19 ` Jens Axboe
2018-10-30 18:32 ` [PATCH 06/16] blk-mq: add 'type' attribute to the sysfs hctx directory Jens Axboe
2018-10-31 0:53 ` Sagi Grimberg
2018-10-31 14:21 ` Jens Axboe
2018-11-01 21:59 ` Omar Sandoval
2018-11-01 22:50 ` Jens Axboe
2018-10-30 18:32 ` [PATCH 07/16] blk-mq: support multiple hctx maps Jens Axboe
2018-10-31 0:59 ` Sagi Grimberg
2018-10-31 14:23 ` Jens Axboe
2018-10-30 18:32 ` [PATCH 08/16] blk-mq: separate number of hardware queues from nr_cpu_ids Jens Axboe
2018-10-31 1:00 ` Sagi Grimberg
2018-10-30 18:32 ` [PATCH 09/16] blk-mq: cache request hardware queue mapping Jens Axboe
2018-10-31 1:01 ` Sagi Grimberg
2018-11-01 9:27 ` Hannes Reinecke
2018-11-01 12:22 ` Jens Axboe
2018-10-30 18:32 ` [PATCH 10/16] blk-mq: cleanup and improve list insertion Jens Axboe
2018-10-31 1:03 ` Sagi Grimberg
2018-11-01 9:28 ` Hannes Reinecke
2018-10-30 18:32 ` [PATCH 11/16] blk-mq: improve plug list sorting Jens Axboe
2018-10-31 1:04 ` Sagi Grimberg
2018-11-01 9:30 ` Hannes Reinecke
2018-10-30 18:32 ` [PATCH 12/16] blk-mq: initial support for multiple queue maps Jens Axboe
2018-10-31 1:14 ` Sagi Grimberg
2018-10-30 18:32 ` [PATCH 13/16] irq: add support for allocating (and affinitizing) sets of IRQs Jens Axboe
2018-10-31 1:17 ` Sagi Grimberg
2018-11-02 14:37 ` Ming Lei
2018-11-02 15:09 ` Keith Busch
2018-11-03 2:22 ` Ming Lei
2018-10-30 18:32 ` [PATCH 14/16] nvme: utilize two queue maps, one for reads and one for writes Jens Axboe
2018-10-31 1:57 ` Sagi Grimberg
2018-10-31 14:32 ` Jens Axboe
2018-10-30 18:32 ` [PATCH 15/16] block: add REQ_HIPRI and inherit it from IOCB_HIPRI Jens Axboe
2018-10-31 1:58 ` Sagi Grimberg
2018-10-30 18:32 ` [PATCH 16/16] nvme: add separate poll queue map Jens Axboe
2018-10-30 18:35 ` Keith Busch [this message]
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