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

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Message-ID: <52612CE6.9080609@hp.com>
Date:	Fri, 18 Oct 2013 06:43:18 -0600
From:	Thavatchai Makphaibulchoke <thavatchai.makpahibulchoke@...com>
To:	Andreas Dilger <adilger@...ger.ca>
CC:	Theodore Ts'o <tytso@....edu>, Eric Sandeen <sandeen@...hat.com>,
	"linux-ext4@...r.kernel.org List" <linux-ext4@...r.kernel.org>,
	"Chandramouleeswaran, Aswin" <aswin@...com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v3 0/2] ext4: increase mbcache scalability

On 10/03/2013 09:22 PM, Andreas Dilger wrote:

> 
> This is a pretty significant price to pay for SELinux in any case.
> I guess it is probably lower overhead with 256-byte inodes, but
> anything that adds 5-25% overhead shouldn't be taken for granted.
> 
> Cheers, Andreas
> 

So far we have determined that,

- With SELinux enabled a ramdisk filesytem, with default node size of 128 bytes, extended xattr is generated
- In one of the aim7 workload, mbcache has a hit ratio of about 65%

Seems like mbcache itself and the mbcache lock optimization attempt by the patch could actually improve performance for a real word system where extended xattr is employed.  I believe the patch should go in if there isn't any concern.

Please let me know if there is any comment or concern about the patch.

Thanks,
Mak.



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