linux-kernel - Re: [PATCH BUGFIX IMPROVEMENT V2 0/1] block, bfq: eliminate latency regression with fast drives

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Date:   Thu, 18 Jul 2019 09:06:41 +0200
From:   Paolo Valente <paolo.valente@...aro.org>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     linux-block <linux-block@...r.kernel.org>,
        linux-kernel@...r.kernel.org, ulf.hansson@...aro.org,
        linus.walleij@...aro.org, bfq-iosched@...glegroups.com,
        oleksandr@...alenko.name
Subject: Re: [PATCH BUGFIX IMPROVEMENT V2 0/1] block, bfq: eliminate latency
 regression with fast drives



> Il giorno 16 lug 2019, alle ore 16:11, Jens Axboe <axboe@...nel.dk> ha scritto:
> 
> On 7/15/19 4:57 AM, Paolo Valente wrote:
>> [V2 that should apply cleanly on current HEAD]
>> 
>> Hi Jens,
>> I've spotted a regression on a fast SSD: a loss of I/O-latency control
>> with interactive tasks (such as the application start up I usually
>> test). Details in the commit.
>> 
>> I do hope that, after proper review, this commit makes it for 5.3.
> 
> If it's a regression, it should have a Fixes: line telling us which
> commit originally introduced the regression. This is important for
> folks doing backports.

Right, sorry.

> Can you add that?
> 

Added, together with an explanation of why the fixed commit fails.

Sending a V3.

Thanks,
Paolo

> -- 
> Jens Axboe
>