[YLUG] user mode linux and slirp

[Liam Wilson]

If only it were that simple! The version of slirp I
have does not allow me to set the baudrate as it is
supposed to run at the maximum possible rate. 

Could this be something to do with incorrect
configuration of the network on the virtual machine?
If run ifconfig I get:
eth0      Link encap:Serial Line IP  
          inet addr:10.0.2.15  Mask:255.0.0.0
          UP RUNNING NOARP  MTU:1500  Metric:1
          RX packets:27 errors:0 dropped:0 overruns:0
frame:0
          TX packets:26 errors:0 dropped:0 overruns:0
carrier:0
          collisions:0 txqueuelen:256 
          RX bytes:3176 (3.1 Kb)  TX bytes:3601
(3.5Kb)
          Interrupt:5 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:4 errors:0 dropped:0 overruns:0
frame:0
          TX packets:4 errors:0 dropped:0 overruns:0
carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:336 (336.0 b)  TX bytes:336 (336.0
b)
If that sheds any light?

Liam

--- Paul Gibbs <paul-listmonkey at pacem.plus.com> wrote:

> 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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