I'd suggest you look at some of the earlier messages about networking on this list and the small amount of information on the Wiki. Networking under Colinux is not currently synchronous. I'd be interested too if somebody could add a brief explanation why that is.
 
--
Matt

From: colinux-users-admin@lists.sourceforge.net [mailto:colinux-users-admin@lists.sourceforge.net] On Behalf Of Sunil
Sent: 29 March 2006 17:46
To: Matt Dockerty; 'colinux'
Subject: RE: [coLinux-users] loopback and some question marks on speed

How can the direction make order of magnitude difference? I notice in the data that the windows uses TCP window size of 64KB for both client and server, while colinux uses 16KB for client and 85KB for server iperf. Are these configured in the kernel?

look at these:

root@co-amd-pc ~
$ iperf -c 10.3.75.1
------------------------------------------------------------
Client connecting to 10.3.75.1, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[  3] local 10.3.75.2 port 51361 connected with 10.3.75.1 port 5001
[  3]  0.0-10.0 sec  39.1 MBytes  32.8 Mbits/sec

root@co-amd-pc ~
$ iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  4] local 10.3.75.2 port 5001 connected with 10.3.75.1 port 3215
[  4]  0.0-10.0 sec    687 MBytes    576 Mbits/sec

Thanks,
Sunil


Matt Dockerty <matthew.dockerty@186k.co.uk> wrote:
I should have mentioned YMMV. Networking doesn't seem like an exact science
in Colinux at this alpha stage and I only got these levels of performance
through blind trial and error.

My setup is a MS Loopback Adapter on a 192.168 subnet and a TAP adapter on
same. My physical LAN is on a 10.10 subnet and Internet Connection Sharing
is enabled. My network config in Colinux is simply this:



Like Holger says 10Mbps means nothing since the loopback driver is only
capped by the limitations of the software. Here are the results I'm getting:

colinux ~ # iperf -c 192.168.0.1
------------------------------------------------------------
Client connecting to 192.168.0.1, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.0.100 port 1767 connected with 192.168.0.1 port 5001
[ 3] 0.0-10.7 sec 69.1 MBytes 54.0 Mbits/sec
colinux ~ # iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[ 4] local 192.168.0.100 port 5001 connected with 192.168.0.1 port 2146
[ 4] 0.0-10.0 sec 125 MBytes 105 Mbits/sec

--
Matt

> -----Original Message-----
> From: colinux-users-admin@lists.sourceforge.net
> [mailto:colinux-users-admin@lists.sourceforge.net] On Behalf
> Of Holger Krull
> Sent: 29 March 2006 07:59
> To: colinux
> Subject: Re: [coLinux-users] loopback and some question marks on speed
>
> Sunil schrieb:
>
> > way? Why are loopback adapters shown as 10Mbps? Is there a
> way to change
> > that?
>
> That is just a label without meaning.
>
>
>
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