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From: Thavatchai Makphaibulchoke <thavatchai.makpahibulchoke@hp.com>
To: Andreas Dilger <adilger@dilger.ca>
Cc: Theodore Ts'o <tytso@mit.edu>, Eric Sandeen <sandeen@redhat.com>,
	"linux-ext4@vger.kernel.org List" <linux-ext4@vger.kernel.org>,
	"Chandramouleeswaran, Aswin" <aswin@hp.com>,
	Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH v3 0/2] ext4: increase mbcache scalability
Date: Fri, 18 Oct 2013 06:43:18 -0600	[thread overview]
Message-ID: <52612CE6.9080609@hp.com> (raw)
In-Reply-To: <DDE42D4A-C3E4-4E63-ADDF-B45A7C7B1A7D@dilger.ca>

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.




  reply	other threads:[~2013-10-18 18:47 UTC|newest]

Thread overview: 63+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-07-18  0:55 [PATCH 0/2] ext4: increase mbcache scalability T Makphaibulchoke
2013-08-22 15:54 ` [PATCH v2 " T Makphaibulchoke
2013-08-22 15:54   ` [PATCH v2 1/2] mbcache: decoupling the locking of local from global data T Makphaibulchoke
2013-08-22 16:53     ` Linus Torvalds
2013-08-22 15:33       ` Thavatchai Makphaibulchoke
2013-08-22 15:54   ` [PATCH v2 2/2] ext4: each filesystem creates and uses its own mc_cache T Makphaibulchoke
2013-08-22 15:54     ` T Makphaibulchoke
2014-01-24 18:31   ` [PATCH v4 0/3] ext4: increase mbcache scalability T Makphaibulchoke
2014-01-24 18:31     ` [PATCH v4 1/3] fs/mbcache.c change block and index hash chain to hlist_bl_node T Makphaibulchoke
2014-01-24 18:31     ` [PATCH v4 2/3] mbcache: decoupling the locking of local from global data T Makphaibulchoke
2014-01-24 18:31     ` [PATCH v4 3/3] ext4: each filesystem creates and uses its own mc_cache T Makphaibulchoke
2014-01-24 21:38     ` [PATCH v4 0/3] ext4: increase mbcache scalability Andi Kleen
2014-01-25  1:13       ` Thavatchai Makphaibulchoke
2014-01-25  6:09       ` Andreas Dilger
2014-01-27 12:27         ` Thavatchai Makphaibulchoke
2014-02-09 19:46         ` Thavatchai Makphaibulchoke
2014-02-11 19:58         ` Thavatchai Makphaibulchoke
2014-02-13  2:01           ` Andreas Dilger
2013-09-04 16:39 ` [PATCH v3 0/2] " T Makphaibulchoke
2013-09-04 16:39   ` [PATCH v3 1/2] mbcache: decoupling the locking of local from global data T Makphaibulchoke
2013-10-30 13:27     ` Theodore Ts'o
2013-10-30 14:42     ` Theodore Ts'o
2013-10-30 17:32       ` Thavatchai Makphaibulchoke
2013-09-04 16:39   ` [PATCH v3 2/2] ext4: each filesystem creates and uses its own mb_cache T Makphaibulchoke
2013-10-30 14:30     ` Theodore Ts'o
2013-09-04 20:00   ` [PATCH v3 0/2] ext4: increase mbcache scalability Andreas Dilger
2013-09-04 15:33     ` Thavatchai Makphaibulchoke
2013-09-05 15:22     ` Thavatchai Makphaibulchoke
2013-09-05  2:35   ` Theodore Ts'o
2013-09-05  9:49     ` Thavatchai Makphaibulchoke
2013-09-06  5:10       ` Andreas Dilger
2013-09-06 12:23         ` Thavatchai Makphaibulchoke
2013-09-10 20:47           ` Andreas Dilger
2013-09-10 21:02             ` Theodore Ts'o
2013-09-10 17:10               ` Thavatchai Makphaibulchoke
2013-09-11  3:13               ` Eric Sandeen
2013-09-11 11:30                 ` Theodore Ts'o
2013-09-11 16:49                   ` Eric Sandeen
2013-09-11 19:33                     ` Eric Sandeen
2013-09-11 20:32                     ` David Lang
2013-09-11 20:48                       ` Eric Sandeen
2013-09-11 21:25                         ` Theodore Ts'o
2013-09-11 20:36                           ` Thavatchai Makphaibulchoke
2013-09-12  3:42                             ` Eric Sandeen
2013-09-12 12:23                             ` Theodore Ts'o
2013-09-13 12:04                               ` Thavatchai Makphaibulchoke
2013-09-13 18:59                                 ` Eric Sandeen
2013-09-17 16:43                                   ` Thavatchai Makphaibulchoke
2013-09-18 14:19                                     ` Eric Sandeen
2013-09-21 18:53                                       ` Theodore Ts'o
2013-09-23 15:35                                         ` Thavatchai Makphaibulchoke
     [not found]                                         ` <D59BF31F-934D-4DE6-9E5C-F92014F09C68@dilger.ca>
2013-09-25 18:43                                           ` Thavatchai Makphaibulchoke
2013-10-04  3:22                                             ` Andreas Dilger
2013-10-18 12:43                                               ` Thavatchai Makphaibulchoke [this message]
2013-10-19 23:06                                                 ` Eric Sandeen
2014-02-20 18:37 ` [PATCH V5 0/3] " T Makphaibulchoke
2014-02-20 18:37   ` [PATCH V5 1/3] fs/mbcache.c change block and index hash chain to hlist_bl_node T Makphaibulchoke
2014-02-20 18:37   ` [PATCH V5 2/3] mbcache: decoupling the locking of local from global data T Makphaibulchoke
2014-02-20 18:37   ` [PATCH V5 3/3] ext4: each filesystem creates and uses its own mb_cache T Makphaibulchoke
2014-03-12 16:19 ` [PATCH v5 RESEND 0/3] ext4: increase mbcache scalability T Makphaibulchoke
2014-03-12 16:19   ` [PATCH v5 RESEND 1/3] fs/mbcache.c change block and index hash chain to hlist_bl_node T Makphaibulchoke
2014-03-12 16:19   ` [PATCH v5 RESEND 2/3] mbcache: decoupling the locking of local from global data T Makphaibulchoke
2014-03-12 16:19   ` [PATCH v5 RESEND 3/3] ext4: each filesystem creates and uses its own mb_cache T Makphaibulchoke

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