Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1724434

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

Show all headers | View raw

> Il giorno 31 ago 2017, alle ore 19:06, Mike Galbraith <efault@gmx.de> 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 

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH BUGFIX/IMPROVEMENT V2 0/3] three bfq fixes restoring service guarantees with random sync writes in bg Paolo Valente <paolo.valente@linaro.org> - 2017-08-31 08:50 +0200
  [PATCH BUGFIX/IMPROVEMENT V2 1/3] block, bfq: make lookup_next_entity push up vtime on expirations Paolo Valente <paolo.valente@linaro.org> - 2017-08-31 08:50 +0200
  [PATCH BUGFIX/IMPROVEMENT V2 3/3] block, bfq: guarantee update_next_in_service always returns an eligible entity Paolo Valente <paolo.valente@linaro.org> - 2017-08-31 08:50 +0200
  [PATCH BUGFIX/IMPROVEMENT V2 2/3] block, bfq: remove direct switch to an entity in higher class Paolo Valente <paolo.valente@linaro.org> - 2017-08-31 08:50 +0200
  Re: [PATCH BUGFIX/IMPROVEMENT V2 0/3] three bfq fixes restoring  service guarantees with random sync writes in bg Jens Axboe <axboe@kernel.dk> - 2017-08-31 16:30 +0200
  Re: [PATCH BUGFIX/IMPROVEMENT V2 0/3] three bfq fixes restoring  service guarantees with random sync writes in bg Mel Gorman <mgorman@techsingularity.net> - 2017-08-31 16:50 +0200
    Re: [PATCH BUGFIX/IMPROVEMENT V2 0/3] three bfq fixes restoring  service guarantees with random sync writes in bg Mike Galbraith <efault@gmx.de> - 2017-08-31 19:10 +0200
      Re: [PATCH BUGFIX/IMPROVEMENT V2 0/3] three bfq fixes restoring service guarantees with random sync writes in bg Paolo Valente <paolo.valente@linaro.org> - 2017-08-31 19:20 +0200
        Re: [PATCH BUGFIX/IMPROVEMENT V2 0/3] three bfq fixes restoring  service guarantees with random sync writes in bg Mike Galbraith <efault@gmx.de> - 2017-08-31 19:40 +0200
    Re: [PATCH BUGFIX/IMPROVEMENT V2 0/3] three bfq fixes restoring  service guarantees with random sync writes in bg Mel Gorman <mgorman@techsingularity.net> - 2017-09-04 10:20 +0200
      Re: [PATCH BUGFIX/IMPROVEMENT V2 0/3] three bfq fixes restoring service guarantees with random sync writes in bg Paolo Valente <paolo.valente@linaro.org> - 2017-09-04 11:00 +0200
      Re: [PATCH BUGFIX/IMPROVEMENT V2 0/3] three bfq fixes restoring  service guarantees with random sync writes in bg Ming Lei <tom.leiming@gmail.com> - 2017-09-04 11:10 +0200

csiph-web