linux-kernel - Re: RFT: updatedb "morning after" problem [was: Re: -mm merge plans for 2.6.23]

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Message-Id: <1185454019.6449.12.camel@Homer.simpson.net>
Date:	Thu, 26 Jul 2007 14:46:58 +0200
From:	Mike Galbraith <efault@....de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Frank Kingswood <frank@...gswood-consulting.co.uk>,
	Andi Kleen <andi@...stfloor.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Ray Lee <ray-lk@...rabbit.org>,
	Jesper Juhl <jesper.juhl@...il.com>,
	ck list <ck@....kolivas.org>, Paul Jackson <pj@....com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: RFT: updatedb "morning after" problem [was: Re: -mm merge
	plans for 2.6.23]

On Thu, 2007-07-26 at 03:09 -0700, Andrew Morton wrote:

> Setting it to zero will maximise the preservation of the vfs caches.  You
> wanted 10000 there.
> 
> <bets that nobody will test this>

drops caches prior to both updatedb runs.

root@...er: df -i
Filesystem            Inodes   IUsed   IFree IUse% Mounted on
/dev/hdc3            12500992 1043544 11457448    9% /
udev                  129162    1567  127595    2% /dev
/dev/hdc1              26104      87   26017    1% /boot
/dev/hda1             108144   90676   17468   84% /windows/C
/dev/hda5              11136    3389    7747   31% /windows/D
/dev/hda6                  0       0       0    -  /windows/E

vfs_cache_pressure=10000, updatedb freshly completed:
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
 1  0     48  76348 420356 104748    0    0     0     0 1137  912  3  1 97  0

ext3_inode_cache  315153 316274    524    7    1 : tunables   54   27    8 : slabdata  45182  45182      0
dentry_cache      224829 281358    136   29    1 : tunables  120   60    8 : slabdata   9702   9702      0
buffer_head       156624 159728     56   67    1 : tunables  120   60    8 : slabdata   2384   2384      0

vfs_cache_pressure=100 (stock), updatedb freshly completed:

procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
1  0    148  83824 270088 116340    0    0     0     0 1095  330  2  1 97  0
 
ext3_inode_cache  467257 502495    524    7    1 : tunables   54   27    8 : slabdata  71785  71785      0
dentry_cache      292695 408958    136   29    1 : tunables  120   60    8 : slabdata  14102  14102      0
buffer_head       118329 184384     56   67    1 : tunables  120   60    8 : slabdata   2752   2752      1

Note:  updatedb doesn't bother my box, not running enough leaky apps I
guess.

	-Mike

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