Hi ,
Look at my memifo pls:
total: used: free: shared: buffers: cached:
Mem: 8490827776 8118534144 372293632 0 252133376 4320608256
Swap: 25165725696 113704960 25052020736
MemTotal: 8291824 kB
MemFree: 363568 kB
MemShared: 0 kB
Buffers: 246224 kB
Cached: 4215008 kB
SwapCached: 4336 kB
Active: 2952512 kB
Inact_dirty: 2277600 kB
Inact_clean: 211712 kB
Inact_target: 1088352 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 8291824 kB
LowFree: 363568 kB
SwapTotal: 24575904 kB
SwapFree: 24464864 kB
Committed_AS: 621197056 kB
HugePages_Total: 0
HugePages_Free: 0
Hugepagesize: 262144 kB
The inact_dirty is 2277600 kB .
> http://www.redhat.com/magazine/001nov04/features/vm/
> Pages in the inactive dirty state ought to be getting flushed
> out to disk, but it looks like this isn't happening.
>
> I'm no kernel expert, but it seems to me that something is
> causing the kernel not to properly launder the inactive dirty
> memory. This could be a kernel bug, so if you are sure you
> don't have any hung processes that could be holding the
> memory open, you should check to see if there is a newer
> kernel available for your system.
How can i be sure that this is a bug?
Kind Regards,
Tolga Evren
-----Original Message-----
From: redhat-list-bounces@xxxxxxxxxx
[mailto:redhat-list-bounces@xxxxxxxxxx] On Behalf Of Smith, Albert
Sent: Thursday, September 15, 2005 8:35 PM
To: General Red Hat Linux discussion list
Subject: RE: Used Memory Not Clearing Down On Redhat Machines.
> -----Original Message-----
> From: redhat-list-bounces@xxxxxxxxxx
> [mailto:redhat-list-bounces@xxxxxxxxxx] On Behalf Of Eris Caffee
> Sent: Friday, August 12, 2005 11:17 AM
> To: General Red Hat Linux discussion list
> Subject: Re: Used Memory Not Clearing Down On Redhat Machines.
>
> > 15:20:33 up 14 days, 2:16, 1 user, load average: 0.00,
> 0.00, 0.00
> > 49 processes: 48 sleeping, 1 running, 0 zombie, 0 stopped
> > CPU states: cpu user nice system irq softirq
> iowait idle
> > total 0.8% 0.0% 0.2% 0.0% 0.6%
> 0.0% 198.4%
> > cpu00 0.0% 0.0% 0.0% 0.0% 0.0%
> 0.0% 100.0%
> > cpu01 0.8% 0.0% 0.2% 0.0% 0.6%
> 0.0% 98.4%
> > Mem: 3599032k av, 2926964k used, 672068k free, 0k
> shrd, 82052k
> > buff
> > 469844k actv, 1731916k in_d, 54940k in_c
> > Swap: 2044072k av, 0k used, 2044072k free
> 2614264k
> > cached
>
> You have an awful lot of memory in the in_d state. That is
> "Inactive Dirty". There's a description of it and the other
> memory states (for 2.4 kernels at least) here:
> http://www.redhat.com/magazine/001nov04/features/vm/
> Pages in the inactive dirty state ought to be getting flushed
> out to disk, but it looks like this isn't happening.
>
> I'm no kernel expert, but it seems to me that something is
> causing the kernel not to properly launder the inactive dirty
> memory. This could be a kernel bug, so if you are sure you
> don't have any hung processes that could be holding the
> memory open, you should check to see if there is a newer
> kernel available for your system.
>
> Of course, you should also double check to make sure there
> really isn't some process from the analysis job still running
> and holding all of this memory open.
>
> Eris Caffee
>
>
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>
I did some investigation with RH EL4 and it looks like this memory
problem is addressed with 2.6.x line of kernel. I am currently compiling
2.6.13 manually on my EL3 to see the results.
I will keep you posted.
Albert Smith
Sr. Unix Systems Administrator
HPCSA, RHCT
Genex Services
440 E. Swedesford Rd.
Wayne, PA 19087
albert.smith@xxxxxxxxxxxxxxxxx
(610) 964-5154
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