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Re: vhost threading model

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"Michael Rapoport" <RAPOPORT@il.ibm.com> writes:
...
>
> Well, Elvis is a _theoretical_ example that showed that I/O scheduling in 
> the vhost improves performance.
> I'm not saying we should take Evlis and try to squeeze it into the vhost, 
> I just want to say that we cannot switch vhost to use workqueues if it 
> causes performance degradation.
>
> My opinion is that we need to give it some more thought, much more 
> performance evaluation, so that we can find the best model.

Exactly, I think we are outright discarding using workqueues even
without investigating it in detail even though it would be a cleaner
implementation using a common framework and thereby more chances of
an acceptable solution for upstream.

Anyway, if we don't want to go the workqueues way for vhost, cgroups
support for workqueues is still something worth having on its own.

>> > opportunity for optimization, at least for some workloads...
>> > That said, I believe that switching vhost to use workqueues is not 
> that 
>> > good idea after all.
>> > 
>
> --
> Sincerely yours,
> Mike.
>
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Thread

[RFC PATCH 0/4] cgroup aware workqueues Bandan Das <bsd@redhat.com> - 2016-03-18 23:20 +0100
  Re: [RFC PATCH 0/4] cgroup aware workqueues Tejun Heo <tj@kernel.org> - 2016-03-20 19:20 +0100
    Re: [RFC PATCH 0/4] cgroup aware workqueues Bandan Das <bsd@redhat.com> - 2016-03-21 18:40 +0100
  Re: [RFC PATCH 0/4] cgroup aware workqueues "Michael Rapoport" <RAPOPORT@il.ibm.com> - 2016-03-21 09:00 +0100
  Re: [RFC PATCH 0/4] cgroup aware workqueues Christian Borntraeger <borntraeger@de.ibm.com> - 2016-03-21 09:30 +0100
    Re: [RFC PATCH 0/4] cgroup aware workqueues Bandan Das <bsd@redhat.com> - 2016-03-21 19:00 +0100
  Re: [RFC PATCH 0/4] cgroup aware workqueues Bandan Das <bsd@redhat.com> - 2016-03-21 18:50 +0100
    vhost threading model (was: Re: [RFC PATCH 0/4] cgroup aware workqueues) "Michael Rapoport" <RAPOPORT@il.ibm.com> - 2016-03-22 08:20 +0100
    Re: vhost threading model Bandan Das <bsd@redhat.com> - 2016-03-22 20:10 +0100
      Re: vhost threading model "Michael Rapoport" <RAPOPORT@il.ibm.com> - 2016-03-23 12:20 +0100
  Re: [RFC PATCH 0/4] cgroup aware workqueues Tejun Heo <tj@kernel.org> - 2016-03-30 19:10 +0200
    Re: [RFC PATCH 0/4] cgroup aware workqueues "Michael Rapoport" <RAPOPORT@il.ibm.com> - 2016-03-31 08:20 +0200
      Re: [RFC PATCH 0/4] cgroup aware workqueues Tejun Heo <tj@kernel.org> - 2016-03-31 19:20 +0200
        Re: [RFC PATCH 0/4] cgroup aware workqueues Bandan Das <bsd@redhat.com> - 2016-03-31 20:50 +0200

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