Source numbers have nothing to do with nodes in the global network. As
you can see in bus.hh:83, the BusPort that receives the packet
rewrites the source id stored in the packet to that of the BusPort.
You can only determine which BusPorts correspond to cores if you know
for sure the order in which things were connected, as Steve stated.
If you are using something like the example fs.py script, and you have
enabled the L2 caches, then I believe port 0 will be the L2 cache
itself, while all higher number ports will be processors. If you
enable the L1 caches, then there are separate instruction and data
caches and each one should have its own port, so it is not actually
the case that each core will have a single port representing it on the
bus. If you leave them off, then the port numbers 1 through np should
correspond to the core number. If you don't have the L2 cache, then
the numbering is more complicated (check in common/FSConfig.py if you
want to figure that out).
Someone correct me if my estimate is wrong. I've not used the example
scripts in quite a while, and I don't think I have ever done any bus
debugging using those scripts.
- Clint
On Nov 5, 2008, at 3:09 PM, Bob Nagel wrote:
Hi Steve thanks for your answer, how can I know the src number of
the cores?, I have been trying to identify them by the access but I
only see dfierent src number accesing to the bus without a clear
pattern, do you know where is the source code in which is assigned
the src number to the cores?. Thank you.
2008/11/5 Steve Reinhardt <[EMAIL PROTECTED]>
The bus IDs are essentially arbitrary... they're assigned by the bus
as devices are connected to it, which happens in an uncontrolled
fashion as the simulation objects are created.
Note that the each object attached to the bus gets its own ID as well,
so for example if you have split I and D caches then each of those
caches will have its own ID.
Steve
On Wed, Nov 5, 2008 at 10:43 AM, Bob Nagel <[EMAIL PROTECTED]> wrote:
> Hello,
>
> I am exploring the information that I get when I put the option
> --trace-flags="bus", but I do not understand the criterium that it
is used
> to assign a src number to the packets. If I do a simulation with 1
core, The
> src number can have this values: 0,1,2, for 2 cores: 0,1,2,3, for 4
> cores:0,1,3,5,7.
>
> Can anyone explain me what is the criterium to assign a source
number for
> the cores, I am just interested in the packets that come from the
cores.
> Thank you.
>
>
>
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