linux-kernel - Re: [PATCH BUGFIX/IMPROVEMENT V2 0/3] three bfq fixes restoring service guarantees with random sync writes in bg

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Message-ID: <20170831144257.oa5nm6vzihpam6kw@techsingularity.net>
Date:   Thu, 31 Aug 2017 15:42:57 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Paolo Valente <paolo.valente@...aro.org>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, ulf.hansson@...aro.org,
        broonie@...nel.org, lee.tibbert@...il.com, oleksandr@...alenko.name
Subject: Re: [PATCH BUGFIX/IMPROVEMENT V2 0/3] three bfq fixes restoring
 service guarantees with random sync writes in bg

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.

-- 
Mel Gorman
SUSE Labs