Re: [fuse-devel] Horrible mmap write performance (kernel writeback issue?)

From	Ashish Sangwan <ashishsangwan2@gmail.com>
Newsgroups	linux.kernel
Subject	Re: [fuse-devel] Horrible mmap write performance (kernel writeback issue?)
Date	2016-04-12 11:30 +0200
Message-ID	<rn2NX-4Qf-5@gated-at.bofh.it> (permalink)
References	(4 earlier) <rh4fM-6NC-3@gated-at.bofh.it> <rhLkK-3al-9@gated-at.bofh.it> <ritlL-15d-5@gated-at.bofh.it> <rmF51-2CR-25@gated-at.bofh.it> <rmUno-6qa-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Tue, Apr 12, 2016 at 5:54 AM, Tejun Heo <tj@kernel.org> wrote:
> Hello,
>
> On Mon, Apr 11, 2016 at 10:04:42AM +0200, Jakob Unterwurzacher wrote:
>> What seems to be happening in the kernel is that the estimated device bandwith
>> drops to zero. I'm not even sure how this works for FUSE, but that's what I
>> gathered from some printk debugging.
>
> Yeah, writeback bw getting messed up is the most likely cause.  Prolly
> some silly bug.  I can reproduce the problem.  Looking into it.

Probably you want to look into:
https://lkml.org/lkml/2016/3/10/21

The patch mentioned above solves the issue for me.

Thanks,
Ashish
>
> Thanks.
>
> --
> tejun

Thread

Re: [fuse-devel] Horrible mmap write performance (kernel writeback  issue?) Jakob Unterwurzacher <jakobunt@gmail.com> - 2016-04-11 10:10 +0200
  Re: [fuse-devel] Horrible mmap write performance (kernel writeback  issue?) Tejun Heo <tj@kernel.org> - 2016-04-12 02:30 +0200
    Re: [fuse-devel] Horrible mmap write performance (kernel writeback issue?) Ashish Sangwan <ashishsangwan2@gmail.com> - 2016-04-12 11:30 +0200
      Re: [fuse-devel] Horrible mmap write performance (kernel writeback  issue?) Tejun Heo <tj@kernel.org> - 2016-04-12 13:10 +0200
        Re: [fuse-devel] Horrible mmap write performance (kernel writeback issue?) Sedat Dilek <sedat.dilek@gmail.com> - 2016-04-13 09:30 +0200

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