Re: [PATCH V7 4/6] blk-mq: introduce .get_budget and .put_budget in blk_mq_ops

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To: "ming.lei@xxxxxxxxxx" <ming.lei@xxxxxxxxxx>, "axboe@xxxxxxxxx" <axboe@xxxxxxxxx>
Subject: Re: [PATCH V7 4/6] blk-mq: introduce .get_budget and .put_budget in blk_mq_ops
From: Bart Van Assche <Bart.VanAssche@xxxxxxx>
Date: Fri, 13 Oct 2017 16:31:04 +0000
Accept-language: en-US
Cc: "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "linux-block@xxxxxxxxxxxxxxx" <linux-block@xxxxxxxxxxxxxxx>, "hch@xxxxxxxxxxxxx" <hch@xxxxxxxxxxxxx>, "tom81094@xxxxxxxxx" <tom81094@xxxxxxxxx>, "paolo.valente@xxxxxxxxxx" <paolo.valente@xxxxxxxxxx>, Bart Van Assche <Bart.VanAssche@xxxxxxx>, "linux-scsi@xxxxxxxxxxxxxxx" <linux-scsi@xxxxxxxxxxxxxxx>, "oleksandr@xxxxxxxxxxxxxx" <oleksandr@xxxxxxxxxxxxxx>, "john.garry@xxxxxxxxxx" <john.garry@xxxxxxxxxx>, "osandov@xxxxxx" <osandov@xxxxxx>, "loberman@xxxxxxxxxx" <loberman@xxxxxxxxxx>
In-reply-to: <20171013160731.GA30899@ming.t460p>
Wdcipoutbound: EOP-TRUE

On Sat, 2017-10-14 at 00:07 +0800, Ming Lei wrote:
> Actually it is in hot path, for example, lpfc and qla2xx's queue depth is 3,

Sorry but I doubt whether that is correct. More in general, I don't know any modern
storage HBA for which the default queue depth is so low.

Bart.

Follow-Ups:
- Re: [PATCH V7 4/6] blk-mq: introduce .get_budget and .put_budget in blk_mq_ops
  - From: Ming Lei
- Re: [PATCH V7 4/6] blk-mq: introduce .get_budget and .put_budget in blk_mq_ops
  - From: Jens Axboe

References:
- [PATCH V7 0/6] blk-mq-sched: improve sequential I/O performance
  - From: Ming Lei
- [PATCH V7 4/6] blk-mq: introduce .get_budget and .put_budget in blk_mq_ops
  - From: Ming Lei
- Re: [PATCH V7 4/6] blk-mq: introduce .get_budget and .put_budget in blk_mq_ops
  - From: Jens Axboe
- Re: [PATCH V7 4/6] blk-mq: introduce .get_budget and .put_budget in blk_mq_ops
  - From: Ming Lei
- Re: [PATCH V7 4/6] blk-mq: introduce .get_budget and .put_budget in blk_mq_ops
  - From: Jens Axboe
- Re: [PATCH V7 4/6] blk-mq: introduce .get_budget and .put_budget in blk_mq_ops
  - From: Ming Lei

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