REG: Memory usage of pppd

[Ramachandra]

Hi,


I have installed pptpd-1.3.0 on my Linux machine (FC 5). ppp version is ppp-2.4.4b1.
I am able to connect to my PPTP server from a windows client. Communication is taking place and everything is fine. The problem is pppd is taking about 1500 k for each connection.

Is there any way we can reduce the memory usage by pppd? I tried with turning off MULTILINK and TDB, but the memory usage remains same. Please let me know if there is any other way.

Thanks and Regards,
Ramachandra

         

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[James Cameron-8]

You really should be asking the PPP mailing list this, it has nothing
much to do with pptpd!

Also, what method are you using to measure pppd memory usage?  I would
use VmRSS in /proc/${PID}/status, and for more detail I would look at
the segments in /proc/${PID}/smaps ... because most of pppd would be
shared between each of several connections.

--
James Cameron
http://quozl.linux.org.au/

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[Ramachandra]

Thanks a lot for the reply. I checked /proc/$PID/smaps and there were a lot of details, which gave me a good start.. According to the smaps, the amount of private memory per each connection is around 600 KB.  I would still like to bring that down, but it has given me something to proceed!
Thanks once again


regards,
Ramachandra
--- On Thu, 8/6/09, James Cameron <quozl@...> wrote:

From: James Cameron <quozl@...>
Subject: Re: [Poptop-server] REG: Memory usage of pppd
To: "Ramachandra M" <poptopserver@...>
Cc: poptop-server@...
Date: Thursday, August 6, 2009, 3:23 AM

You really should be asking the PPP mailing list this, it has nothing
much to do with pptpd!

Also, what method are you using to measure pppd memory usage?  I would
use VmRSS in /proc/${PID}/status, and for more detail I would look at
the segments in /proc/${PID}/smaps ... because most of pppd would be
shared between each of several connections.

--
James Cameron
http://quozl.linux.org.au/

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[James Cameron-8]

On Wed, Aug 12, 2009 at 10:03:05PM -0700, Ramachandra M wrote:
> According to the smaps, the amount of
> private memory per each connection is around 600 KB.

That still seems excessive, but not unusual.  You could produce a linker
map listing of pppd to determine what that memory is used for.

> I would still like to bring that down, but it has given me something
> to proceed!

Have you considered the PPTP kernel module?  I don't think it is merged
with the kernel yet, but I've heard of people using it.  I imagine it
would have a particularly low per-user memory cost.

--
James Cameron
http://quozl.linux.org.au/

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[Charlie Brady-13]

On Thu, 13 Aug 2009, James Cameron wrote:

> > I would still like to bring that down, but it has given me something
> > to proceed!
>
> Have you considered the PPTP kernel module?  I don't think it is merged
> with the kernel yet, but I've heard of people using it.  I imagine it
> would have a particularly low per-user memory cost.

The kernel module wouldn't do anything for pppd memory usage though. AIUI,
it's main benefit is in reducing CPU usage in dispatching back and forth
between pppd and pptpd.


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