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Date:   Thu, 31 Aug 2017 19:12:57 +0200
From:   Paolo Valente <>
To:     Mike Galbraith <>
Cc:     Mel Gorman <>,
        Jens Axboe <>,
        linux-block <>,
        Linux Kernel Mailing List <>,
        Ulf Hansson <>,,,
Subject: Re: [PATCH BUGFIX/IMPROVEMENT V2 0/3] three bfq fixes restoring service guarantees with random sync writes in bg

> Il giorno 31 ago 2017, alle ore 19:06, Mike Galbraith <> ha scritto:
> On Thu, 2017-08-31 at 15:42 +0100, Mel Gorman wrote:
>> On Thu, Aug 31, 2017 at 08:46:28AM +0200, Paolo Valente wrote:
>>> [SECOND TAKE, with just the name of one of the tester fixed]
>>> Hi,
>>> while testing the read-write unfairness issues reported by Mel, I
>>> found BFQ failing to guarantee good responsiveness against heavy
>>> random sync writes in the background, i.e., multiple writers doing
>>> random writes and systematic fdatasync [1]. The failure was caused by
>>> three related bugs, because of which BFQ failed to guarantee to
>>> high-weight processes the expected fraction of the throughput.
>> Queued on top of Ming's most recent series even though that's still a work
>> in progress. I should know in a few days how things stand.
> It seems to have cured an interactivity issue I regularly meet during
> kbuild final link/depmod phase of fat kernel kbuild, especially bad
> with evolution mail usage during that on spinning rust.  Can't really
> say for sure given this is not based on measurement.

Great!  Actually, when I found these bugs, I thought also about the
issues you told me you experienced with updatedb running.  But then I
forgot to tell you that these fixes might help.


> 	-Mike 

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