linux-kernel - Re: [PATCH V5 00/14] blk-mq-sched: improve sequential I/O performance(part 1)

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Date:   Tue, 10 Oct 2017 14:37:46 +0200
From:   Paolo Valente <paolo.valente@...aro.org>
To:     Johannes Thumshirn <jthumshirn@...e.de>
Cc:     John Garry <john.garry@...wei.com>, Ming Lei <ming.lei@...hat.com>,
        Jens Axboe <axboe@...com>,
        linux-block <linux-block@...r.kernel.org>,
        Christoph Hellwig <hch@...radead.org>,
        Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
        Bart Van Assche <bart.vanassche@...disk.com>,
        Laurence Oberman <loberman@...hat.com>,
        Oleksandr Natalenko <oleksandr@...alenko.name>,
        Tom Nguyen <tom81094@...il.com>, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org, Omar Sandoval <osandov@...com>,
        Linuxarm <linuxarm@...wei.com>
Subject: Re: [PATCH V5 00/14] blk-mq-sched: improve sequential I/O performance(part 1)


> Il giorno 10 ott 2017, alle ore 14:34, Johannes Thumshirn <jthumshirn@...e.de> ha scritto:
> 
> Hi John,
> 
> On Tue, Oct 10, 2017 at 01:24:52PM +0100, John Garry wrote:
>> It's using cfq (for non-mq) and mq-deadline (obviously for mq).
> 
> Please be aware that cfq and mq-deadline are _not_ comparable, for a realistic
> comparasion please use deadline and mq-deadline or cfq and bfq.
> 

Please set low_latency=0 for bfq if yours is just a maximum-throughput test.

Thanks,
Paolo

>> root@(none)$ pwd
>> /sys/devices/platform/HISI0162:01/host0/port-0:0/expander-0:0/port-0:0:7/end_device-0:0:7
>> root@(none)$ more ./target0:0:3/0:0:3:0/block/sdd/queue/scheduler
>> noop [cfq]
> 
> Maybe missing CONFIG_IOSCHED_DEADLINE?
> 
> Thanks,
> 	Johannes
> 
> -- 
> Johannes Thumshirn                                          Storage
> jthumshirn@...e.de                                +49 911 74053 689
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