Il giorno 04 set 2017, alle ore 10:14, Mel Gorman =

[off-list ref] ha scritto:

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On Thu, Aug 31, 2017 at 03:42:57PM +0100, Mel Gorman wrote:

quoted

On Thu, Aug 31, 2017 at 08:46:28AM +0200, Paolo Valente wrote:

quoted

[SECOND TAKE, with just the name of one of the tester fixed]
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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

quoted

quoted

three related bugs, because of which BFQ failed to guarantee to
high-weight processes the expected fraction of the throughput.
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Queued on top of Ming's most recent series even though that's still a =

work

quoted

in progress. I should know in a few days how things stand.
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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.

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Great news!

Thanks for testing,
Paolo

Thanks.
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Mel Gorman
SUSE Labs