Re: [ECOS] Re: eCos Performance/ eth0, eth1 Routing problem(number of hops!)

[Gary Thomas <gary at mlbassoc dot com>]

On Mon, 2005-09-12 at 18:09 -0700, mkhoyila@uci.edu wrote:
> Thanks Gary. Please note my responses.
> 
> > On Mon, 2005-09-12 at 14:32 -0700, mkhoyila@uci.edu wrote:
> >> Indeed, it was cache enabling problem.
> >>
> >> Here is the new numbers which are getting closer but still needs some
> >> work:
> >>
> >> Linux: max 26,000 packets (60 bytes) per second (single burst) with no
> >> drops
> >>
> >> eCos: max 23,500 packets (60 bytes) per second (single burst) with no
> >> drops
> >>
> >
> > This is good to know.  Obviously there are some things that could be
> > worked on, but it's quite close (and given the differing strategies,
> > not hard to imagine)
> >
> >> I DO HAVE A SETUP ISSUE which I need help. I want to route packet coming
> >> in from IP address: 192.168.1.80 to eth0 (IP ROUTE) to eth1 and eth1 to
> >> route to its destination ip: 192.168.2.80. As you see the purpose is to
> >> test performance of my driver and eCos vs Linux by SmartBits. Here is an
> >> snap-shot of my eCos route table:
> >
> > What makes you think this should happen automatically?  What have you
> > done to tell eCos that packets that come in on the 192.168.1.x network
> > should automatically flow through to the 192.168.2.x network?
> 
> Isn't this just pure IP routing table look up and forwarding to proper
> interface?
> 
> 1) source 192.168.1.80 prepare a packet with mac address of eth0 and IP
> address of target (192.168.2.80) and sends it
> 2) eth0 receives the packet and passes it to IP layer, since the IP
> address does not match the ip address of eth0, routing table should be
> consulted to deliver the packet to proper interface
> 3) eth1 gets the packets and sends it to its target.
> 
> Shouldn't eCos do this, am I mistaken and not enabled a feature in eCos?

IIRC, only if bridging is enabled.  Of course, you could look at the 
code (just as I would have to) to verify.

In Linux, this only happens if you have such forwarding enabled, e.g.
ipv4_forward set non-zero. (2.4 kernels)

-- 
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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