There is actually supposed to be support for this in the simulator
already. There is an object called EtherTap that interfaces a virtual
ethernet device to a Linux Tap device (virtual ethernet device) which
can be bridged with a real device. The Tap interface is actually used by
software like Qemu to interface with the rest of the world. I haven't
used it myself (in fact I haven't tried to use any of the network
devices in gem5 and I don't know of anyone who has, so I'm not sure that
it works.
As Andreas already pointed out, you'll probably have a hard time to get
meaningful results from your simulations if you use this since there
will be a significant speed difference between the real world and the
simulated world. You might be able to get the atomic CPU to run fast
enough to get things to work.
//Andreas
On 07/11/2013 02:54 PM, Andreas Hansson wrote:
Hi Zhangyi,
gem5 does currently not support any interaction with the host-side
ethernet. It would be a very valuable addition (although it would make
simulations non-deterministic), and the tricky bit is the big speed
difference between the guest and the host. TCP/IP has a lot of timers that
would cause havoc if you simply tried to bridge the interfaces (like e.g.
vmware, parallels and virtualbox does). If you want to start working on a
gem5 guest/host-ethernet bridge, I'd say go ahead and kick off a
discussion about the design. I'm sure there's plenty people out there with
ideas.
When it comes to your second question it is also not available today.
Someone would have to implement an ethernet switch. This should not be too
complex (far easier than the bridge above) and would also be a very
welcome addition to the toolbox.
In short: great ideas, we just need someone to actually do it.
Andreas
On 11/07/2013 09:10, "zhangyi"<[email protected]> wrote:
Hi,all
We have a need that simulated FS ARM communicates with other real hosts
through ethernet. I don't know if gem5 supports that right now. If
doesn't, how can I try to make it? Is there anyone having ideas about
this problem?
Besides, I know that the gem5 supports --dual args, with which booting
two instances linked by a etherlink can be possible. Can gem5 supports
three or more instances connected in a ethernet?
Any answers will be appreciated!
zhangyi
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