Did you run slabtop ? It can show unreleased buffers in the system.
----- Original Message -----
From: Luis Freitas
To: Alexei_Roudnev ; Brian Sieler ; [email protected]
Sent: Monday, April 09, 2007 2:29 PM
Subject: Re: [Ocfs2-users] High on buffers and deep on swap
Alexei,
Yes, it seems to have no effect, which too is very strange. On 2.4
vm.freepages had a very easy to notice effect.
There are other people having problems with buffers not being released on
the list and some of them are forcing the kernel cache to be flushed with:
echo 3 > /proc/sys/vm/drop_caches
But I dont see this parameter on RHAS 4.0.
Also, to be fair this seems to be a generic VM issue, I see this on
servers that are not running ocfs2 too. And I only see this behavior on
machines with more than 2Gb of memory.
Regards,
Luis
Regards,
Luis
Alexei_Roudnev <[EMAIL PROTECTED]> wrote:
Did you tried vm.swappiness parameter?
(/proc/sys/vm/swappiness)
-----
Original Message -----
From: Brian Sieler
To: 'Luis Freitas' ; [email protected]
Sent: Sunday, April 08, 2007 10:52 PM
Subject: RE: [Ocfs2-users] High on buffers and deep on swap
Luis, yes I am experiencing what appears to be a similar problem you are
describing. See my post from just a few minutes ago on another thread.
I run a 2-node cluster with OCFS2/RAC on 2.6.9-34.0.2.ELsmp (RHEL 4.0) as
well.
total used free shared buffers cached
Mem: 4044496 4005516 38980 0 34108 2236636
-/+ buffers/cache: 1734772 2309724
Swap: 2097144 648244 1448900
If you've uncovered anything since posting this message, please pass it
along?
--------------------------------------------------------------------------
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Luis
Freitas
Sent: Friday, February 23, 2007 5:32 PM
To: [email protected]
Subject: [Ocfs2-users] High on buffers and deep on swap
Hi,
This is a bit off topic, hope there is not a problem.
Anyone out there experiencing high swapping with the kernel retaining
a large amount of buffers? This used to be a problem on 2.4, and I usually
changed /proc/sys/vm/freepages to fix it. But on 2.6 this parameter no longer
exists.
One of the servers here is holding over 3.5Gb of cache even when
using over 700Mb of swap, and free memory is always low.
[EMAIL PROTECTED] ~]$ free
total used free shared buffers cached
Mem: 5190736 4810880 379856 0 143032 3583868
-/+ buffers/cache: 1083980 4106756
Swap: 2048248 723064 1325184
[EMAIL PROTECTED] ~]$
I am tuning /proc/sys/vm/swappiness, but this seems to have no effect
at all. Changed from 60 to 10 and seems to have no effect. The server runs
Oracle RAC with OCFS2.
Regards,
Luis
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