Latency

I have a cable connection to the internet. When I upload things in Linux and
then ping somebody, say pair.com, the response times are around
1000-1500ms. However, when I upload from the same machine using Windows,
the response times are normal (about 60-80ms). Reponse times are also
normal when I download in Linux. I am running Mandrake 9.1 with kernel
2.4.21. Does anyone know what's going on here?


Thank you,


--
Andy Zhang

Remove "removethis" to reply by email

Andy Zhang wrote:

>
> I have a cable connection to the internet. When I upload things in Linux
> and then ping somebody, say pair.com, the response times are around
> 1000-1500ms. However, when I upload from the same machine using Windows,
> the response times are normal (about 60-80ms). Reponse times are also
> normal when I download in Linux. I am running Mandrake 9.1 with kernel
> 2.4.21. Does anyone know what's going on here?

Here's what is going on -- you haven't provided enough information. Which
machine has the Internet access: the Windows machine, the Linux machine, or
a shared router?

You say "I have a cable connection to the internet", but you don't say how
the connection is distributed to the machines.

You also don't reveal anyting about your network setup.

--
Paul Lutus
http://www.arachnoid.com

> I have a cable connection to the internet. When I upload things in Linux
> and then ping somebody, say pair.com, the response times are around
> 1000-1500ms. However, when I upload from the same machine using Windows,
> the response times are normal (about 60-80ms). Reponse times are also
> normal when I download in Linux. I am running Mandrake 9.1 with kernel
> 2.4.21. Does anyone know what's going on here?

Windows IMO has a smaller MRU/MTU size. So more packets with less
content. Which gives the appearance of being responsive. But in large
data transfers results in significant overhead of tcp/ip headers. Linux
defaults to like 1500 byte packets, where windows is probably more like
256 byte packets. Perhaps this is where you're seeing the differences.
Just my take on things.

FWIW, I modified my dialup to use about 800 byte packets. Since I get a
rather slow connect rate, even for dialup. And this appears to be more
responsive. I'm not sure what you edit for cable connections, but on
dialup, it's the /etc/ppp/options file. Or have pppd start with the
appropriate options by whatever means you're starting pppd with.

Shadow_7

<I am reposting this because it's been about 2 hours since the first time I
posted this message and it still hasn't shown up.>

Paul Lutus wrote:

>
> Here's what is going on -- you haven't provided enough information. Which
> machine has the Internet access: the Windows machine, the Linux machine,
> or a shared router?
>
> You say "I have a cable connection to the internet", but you don't say how
> the connection is distributed to the machines.
>
> You also don't reveal anyting about your network setup.
>

This is one machine with Windows and Linux both installed on it behind a
D-Link DI-704P router.

Thanks,


--
Andy Zhang

Remove "removethis" to reply by email

Andy Zhang wrote:

>
> I have a cable connection to the internet. When I upload things in Linux
> and then ping somebody, say pair.com, the response times are around
> 1000-1500ms. However, when I upload from the same machine using Windows,
> the response times are normal (about 60-80ms). Reponse times are also
> normal when I download in Linux. I am running Mandrake 9.1 with kernel
> 2.4.21. Does anyone know what's going on here?

If it's windows XP, I think there is a basic bandwidth throttle, in Linux
you can set one up - as complicated as you like.

As for downloads - maybe the way cable works lets this happen - have never
had one to play with.

The real test is to game and download/upload see what happens.

I assume these results are truly repeatable.

Andy.