linux-kernel - Re: Buffer cache not working.

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Message-ID: <20140520130556.GA10945@dhcp22.suse.cz>
Date:	Tue, 20 May 2014 15:05:56 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Rogier Wolff <R.E.Wolff@...wizard.nl>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Buffer cache not working.

On Wed 14-05-14 16:46:32, Rogier Wolff wrote:
[...]
> Kernel: from Ubuntu 14.04, 3.13.0-19-generic

The kernel is 64b right?

> 32-bit userspace
> 16Gb RAM installed. 
> Disks: 3x 3T in RAID5
> 
> ganglia shows the server memory graph as follows: 
> http://prive.bitwizard.nl/server_mem.png

This shows that the memory usage didn't go over 5G. That is suspicious.
Is this a NUMA machine? Is it possible that zone_reclaim_mode is enabled
(cat /proc/sys/vm/zone_reclaim_mode)?
 
> All other computers have a "nice" filled graph there.
> 
> So, is there a bug in my kernel or am I missing an important tuning
> parameter?
> 
> 
> 	Roger. 
> 
> -- 
> ** R.E.Wolff@...Wizard.nl ** http://www.BitWizard.nl/ ** +31-15-2600998 **
> **    Delftechpark 26 2628 XH  Delft, The Netherlands. KVK: 27239233    **
> *-- BitWizard writes Linux device drivers for any device you may have! --*
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-- 
Michal Hocko
SUSE Labs
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