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

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Message-ID: <f2a74e2c-31ac-e366-83d1-9837531daddf@kernel.dk>
Date:   Fri, 13 Oct 2017 10:33:40 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Bart Van Assche <Bart.VanAssche@....com>,
        "ming.lei@...hat.com" <ming.lei@...hat.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "hch@...radead.org" <hch@...radead.org>,
        "tom81094@...il.com" <tom81094@...il.com>,
        "paolo.valente@...aro.org" <paolo.valente@...aro.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "oleksandr@...alenko.name" <oleksandr@...alenko.name>,
        "john.garry@...wei.com" <john.garry@...wei.com>,
        "osandov@...com" <osandov@...com>,
        "loberman@...hat.com" <loberman@...hat.com>
Subject: Re: [PATCH V7 4/6] blk-mq: introduce .get_budget and .put_budget in
 blk_mq_ops

On 10/13/2017 10:31 AM, Bart Van Assche wrote:
> 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.

That does seem insanely low. BTW, even a low depth isn't an issue, as long as
we know what it roughly is.


-- 
Jens Axboe