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

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Message-ID: <CAEvdpX2F7Wu6eHTEe3LatFPRb7mhtu8EWHyokr310MWpRErQUA@mail.gmail.com>
Date:	Tue, 19 Apr 2016 21:35:38 -0400
From:	Howard Cochran <hcochran@...nelspring.com>
To:	Jakob Unterwurzacher <jakobunt@...il.com>
Cc:	Tejun Heo <tj@...nel.org>,
	Ashish Sangwan <ashishsangwan2@...il.com>,
	Miklos Szeredi <miklos@...redi.hu>,
	fuse-devel <fuse-devel@...ts.sourceforge.net>,
	Linux-Fsdevel <linux-fsdevel@...r.kernel.org>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [fuse-devel] Horrible mmap write performance (kernel writeback issue?)

On Mon, Apr 18, 2016 at 5:06 PM, Jakob Unterwurzacher
<jakobunt@...il.com> wrote:
> On 12.04.2016 13:09, Tejun Heo wrote:
>>>
>>> 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.
>
> Works wonderfully now, thanks to everybody involved. Is it too late for 4.6?
>
> Best regards,
> Jakob
>
Jakob, et. al.

You're welcome.  That performance problem stumped me for a couple of
weeks until tracked it down and submitted the fix.

Howard