linux-kernel - Re: [PATCH 1/2] writeback: add dirty_background

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Date:	Wed, 12 Sep 2012 08:12:40 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Namjae Jeon <namjae.jeon@...sung.com>,
	Vivek Trivedi <t.vivek@...sung.com>
Subject: Re: [PATCH 1/2] writeback: add dirty_background_time per bdi variable

>>
>> To be frank, no realistic NFS servers will use USB disk as backing
>> storage. So that rational for reducing "initial" delays is weak.
>> Continuous write performance to HDD is much more important. Do you
>> have numbers for that?
>
> Actually, we use USB HDD and USB Flash devices at NFS server.
> There can be other similar users as well. So it might be useful to
> provide this tuning feature other.
> As default value is zero, it is disabled by default and it should not
> impact normal writeback.
>
> I will share large file writes test result on NFS client on USB HDD
> with/without tuning with patch.
Hi. Wu.
I share 1GB continous write test result.

-> create a 1000 MB file
For continuous write - create 1 GB file

 RecSize   WriteSpeed
10485760   10.47MB/sec
 1048576   10.35MB/sec
  524288   10.48MB/sec
  262144   10.48MB/sec
  131072   10.52MB/sec
   65536   10.56MB/sec
   32768   10.64MB/sec
   16384   10.31MB/sec
    8192   10.52MB/sec
    4096   10.45MB/sec

I will update changelog in patch.

Thanks Wu!.
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