--- On Fri, 8/8/08, Winelfred G. Pasamba <[EMAIL PROTECTED]> wrote:
> From: Winelfred G. Pasamba <[EMAIL PROTECTED]>
> Subject: Re: [plug] bandwidth testing with iperf, TCP window size
> To: [EMAIL PROTECTED], "Philippine Linux Users' Group (PLUG) Technical
> Discussion List" <[email protected]>
> Date: Friday, August 8, 2008, 2:42 PM
> what's your arrangement with your isp?
> you might be on the consumer plans instead of the plans
> with CIR.
>
Will ask our secretary to dig out the details...however, the agent i spoke to
said that the CIR should be 2mbps din, since it's dedicated.
> On Fri, Aug 8, 2008 at 10:28 AM, plug bert
> <[EMAIL PROTECTED]> wrote:
> > Hello All,
> >
> > Need your inputs peeps.
> >
> > We're currently running some tests on our link,
> which is supposed to be a 2Mbps dedicated line. The test
> involves putting up an iperf server on our side, then
> running iperf in client mode on the remote side(i.e. Hong
> Kong).
> >
> >
> > So far the number's we're getting aren't
> very impressive: initially we only got 150-180kbps, and only
> recently, around 300kbps.
> >
> >
> > i know that it's wishful thinking to expect
> anything near 2Mbps, but i really wasn't expecting the
> numbers to be that bad; i was expecting at least somewhere
> in the 1.5Mbps range.
> >
> >
> > 1.) Is it reasonable to expect those figures? The
> thing is that we're getting more or less the same
> numbers(actually, a little better numbers) from our backup
> link -- which doesn't even cost half of what we're
> paying for the link in question. Even if the speedtest.net
> results suggest that we're hitting 1Mbps...well, fact of
> the matter is, we don't need 1-2mbps going to
> speedtest.net, we need 2mbps going to our HK office B)
> >
> >
> > Right now i'm thinking in terms of the cost; i.e.
> if we're paying X times more for this ISP, then the link
> should be at least X times faster than our backup link. Mas
> reasonable po ba kung ganito ang reasoning?
> >
> >
> >
> > 2.) i read somewhere that the TCP window size can
> affect the speed; the impression i got from some sites is
> that you can increase performance in orders of magnitude.
> However, from my own testing, i find that the difference is
> marginal once you hit around 8kb -- i.e. the iperf results
> didn't vary that much when the specified window size is
> around 8Kb all the way up to 4Mb(there's only a very
> significant difference when you set it at ridiculously small
> sizes, e.g. 10 - 100 bytes). By default i think Linux sets
> it to 16kb, so right now i'm inclined to just disregard
> its effect on the speed/testing.
> >
> >
> > 3.) btw, are there any other alternatives to really
> get 2mbps going to our remote site? Leased line perhaps?
> >
> >
> > tia
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > _________________________________________________
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> >
>
>
>
> --
> Seek ye first the kingdom of God and all these things shall
> be added unto you.
>
> Winelfred G. Pasamba
> Adventist University of the Philippines Online Information
> Systems
> _________________________________________________
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