Re: [Devil-Linux-discuss] [BULK] Re: RAM Usage

[John J. <jo...@jo...>]

Frank,
Thank you very much for this. My DL box was having problems last night and =
a reboot solved it. and it was low on memory with INIT constantly re-spawni=
ng. And I too use net-snmpd.

In your experience, was it enough to restart snmpd and would adding this to=
 a cron job once a month potentially be enough to avoid restarting the enti=
re DL?


Regards,
John Jore



________________________________________
From: dev...@li... [devil-linux-discus=
s-b...@li...] On Behalf Of Frank Weis [Fra...@ct...=
]
Sent: 07 November 2007 07:28
To: dev...@li...
Subject: Re: [Devil-Linux-discuss] [BULK] Re:  RAM Usage

On Tuesday 06 November 2007 20:28:07 Serge Leschinsky wrote:
> Hi Matthew,
>
> Matthew Hattersley wrote:
> > We have around 150 DL boxes out in the wild now, and there may be a
> > small problem that keeps happening. Under heavy load the boxes will
> > start running low on RAM, at which point we get malloc errors for some
> > daemons running on the unit. First thing to go is usual snmpd, which
> > isn't a major issue. But further down the line we start loosing things
> > like ssh, and in some cases even more crtical processes.
>
> That's weird! I've just finished troubleshooting of terrible memory leaks
> in our application (not DL related) and faced that net-snmp 5.4.0 eats
> memory with greate speed (especially libsnmp). The release notes for 5.4.=
1
> show that some leaks were fixed in 5.4.1 (  [BUG 1619827],[PATCH 1616912]=
,
> [PATCH 1592706]). I think we may update net-snmp to 5.4.1 but I've not
> checked yet if the update really solves our problem (and I can't guarante=
e
> it solves your problem).

I can confirm the memory leakage in net-snmpd. At the time I discovered it =
I
googled around a bit, and it seemed to be a well known problem with
net-snmpd.

snmpd eats up to 90% of memory on my DLs (256 MB RAM), and then stuff start=
s
to fail. I obviously notice it when ssh fails.

As a workaround, I just restart snmpd on all my DLs every once in a while..=
..
MRTG handles this nicely, and I don't loose to much information.

It looks like the problem occurs mostly/sooner on boxes that run ipsec tunn=
els
too.

Matthew: wow, 150 DLs. How do you manage them?

Have a nice day,

Frank
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