> Il giorno 31 ago 2017, alle ore 19:06, Mike Galbraith <efault@xxxxxx> 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. Thanks, Paolo > -Mike
