Re: Help with troubleshooting performance issue

Thanks, James.
I am learning heaps.

On Tue, Apr 2, 2013 at 4:13 PM, James Cameron <[email protected]> wrote:

>
> Doesn't seem interesting.
>
> ipsec is entirely kernel based, so you will see a performance
> improvement purely based on scheduling.
>
>
Like I said, this is for lab exercise, assigned by my tutor, not my choice
:)


> Means the throughput degradation is due to missing packets.
>
>
And if I get this correct, this could be because of the contention between
pptp daemon and other user-space processes?



>
> It depends on the CPU performance, the type of memory, the kernel
> version, and the amount of contention among user-space processes.
> What contention do you observe?  (uptime, load averages).
>
>
I did top command while the transfer was going.
On both machines, the load average didn't go above 0.08 for both machines,
and CPU %us on both machines didn't go above 9%.




> But yes, I would not be surprised if on a typical pair of machines
> that PPTP might sustain a bandwidth of more than a tenth of native
> link bandwidth.
>

Sorry to be banging on about this again, but I do want to re-confirm.
Do you mean you won't be suprised if ppptp might not sustaion a bandwidth
of more than a tenth of native link bandwidth?
>From what you wrote, I gather that pptp *should* be able to sustain traffic
more than a tenth of native link bandwidth.



>
> You might isolate the problem further by testing a client or server
> using another operating system.
>
>
I have also tested this with a Ubuntu server on different machine (same
deal), with Windows client, and OS X client.
They all give me almost the same result, some slightly faster than the
other.
Thanks again, James!

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