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

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Message-ID: <20171013164519.GF30899@ming.t460p>
Date:   Sat, 14 Oct 2017 00:45:20 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Bart Van Assche <Bart.VanAssche@....com>
Cc:     "axboe@...nel.dk" <axboe@...nel.dk>,
        "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 Fri, Oct 13, 2017 at 04:31:04PM +0000, 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.

You can grep:

[ming@...g linux]$ git grep -n cmd_per_lun ./drivers/scsi/ | grep -E "qla2xxx|lpfc"

Even SRP/IB isn't big too, just 32.

-- 
Ming