Messages in this thread | | | Date | Wed, 13 Apr 2016 09:20:58 +0200 | Subject | Re: [fuse-devel] Horrible mmap write performance (kernel writeback issue?) | From | Sedat Dilek <> |
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On Tue, Apr 12, 2016 at 1:09 PM, Tejun Heo <tj@kernel.org> wrote: > Hello, > > On Tue, Apr 12, 2016 at 02:54:08PM +0530, Ashish Sangwan wrote: >> 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. > > Heh, I tracked it down to wb_over_bg_thresh() and fell asleep. Yeah, > that is the right fix. >
Feel free to add my...
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Patch available from [1].
- sed@ -
[1] https://patchwork.kernel.org/patch/8554181/
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