linux-ext4 - Re: [PATCH v3 0/2] ext4: increase mbcache scalability

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Date:	Wed, 25 Sep 2013 12:43:01 -0600
From:	Thavatchai Makphaibulchoke <thavatchai.makpahibulchoke@...com>
To:	Andreas Dilger <adilger@...ger.ca>
CC:	Theodore Ts'o <tytso@....edu>, Eric Sandeen <sandeen@...hat.com>,
	T Makphaibulchoke <tmac@...com>,
	"linux-ext4@...r.kernel.org List" <linux-ext4@...r.kernel.org>,
	"aswin@...com" <aswin@...com>,
	"aswin_proj@...ts.hp.com" <aswin_proj@...ts.hp.com>
Subject: Re: [PATCH v3 0/2] ext4: increase mbcache scalability

On 09/21/2013 05:12 PM, Andreas Dilger wrote:
> I just noticed that we have a patch for Lustre that adds a "no_mbcache" mount option to disable mbcache on a per-filesystem basis.
> 
> The newest patch we have is based on FC19 (3.10 kernel), is this something that would be of interest if we submitted it upstream?
> 
> http://review.whamcloud.com/#/c/7263/8/ldiskfs/kernel_patches/patches/fc19/ext4-disable-mb-cache.patch
> 
> Cheers, Andreas
> 

Here are some of the improvement I saw with SELinux disabled.

On an 80 core machine,

custom 15.5%
disk 27.81
fserver 5.33%
new_dbase 9.06%
new_fserver 5.45%


On an 8 core machine,

alltests 5.24
custom 2.26
shared 9.32
short 24.08

The rest is not noticably different.

Thanks,
Mak.


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