[YLUG] user mode linux and slirp

[Paul Gibbs]

I can tell you why it's slow (IIRC), but not how to fix it...

slirp recognises the importance of lo latency, it also knows that many 
serial interfaces have large buffers and so does its own rate limiting.

I'm surprised that you get 64KB/s I'd expect it to limit by default to 
64Kb/s.

Anyway you just need to find the correct parameter....
...and a quick Google says, (from 
http://www.cs.ualberta.ca/doc/Software_manuals/slirp.doc.txt) to call 
slirp with -b big-number-in-bits/s
Go to '8. Setting the "baudrate" Option' within that document for more 
details.

Paul.<><

Liam Wilson wrote:
> Hi
>
> I've just been playing around with user mode linux.
> I've got myself a slackware 10.2 virtual machine which
> I'm trying to use with slirp networking. I start the
> machine with:
>
> vmlinux ubd0=root_fs eth0=slirp,,path/to/slirp
>
> One booted I bring up the network with:
>
> ifconfig eth0 10.0.2.15 up
> route add default dev eth0
>
> In my .slirprc file I have the line:
> redir tcp 5555 22 ie to allow me to ssh into the
> virtual machine.
> The problem is that data transfer from the machine is
> very slow (about 64KB/s). I have the fullbolt version
> of slirp from slirp_1.0.17-1_i386.deb which should
> work at full speed. This only affects data transfer
> from the machine, when transfering data to the machine
> I get about 2MB/s. Does anyone know a fix for this? I
> was trying to run X applications on the machine so I
> need as much bandwith as possible.
>
> Thanks
> Liam
>
>
>  
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