Messages in this thread | | | From | Ming Lei <> | Date | Mon, 4 Sep 2017 17:07:14 +0800 | Subject | Re: [PATCH BUGFIX/IMPROVEMENT V2 0/3] three bfq fixes restoring service guarantees with random sync writes in bg |
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On Mon, Sep 4, 2017 at 4:14 PM, Mel Gorman <mgorman@techsingularity.net> wrote: > On Thu, Aug 31, 2017 at 03:42:57PM +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. >> > > The problems with parallel heavy writers seem to have disappeared with this > series. There are still revisions taking place on Ming's to overall setting > of legacy vs mq is still a work in progress but this series looks good.
Hi Mel and Paolo,
BTW, no actual functional change in V4.
Also could you guys provide one tested-by since looks you are using it in your test?
Thanks, Ming Lei
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