Hi Erfan,
Multi hops is supported by having the bridging agent (cache or bridge) storing
the old dest in the packet sender state (which is a stack) and then restoring
it on the way back. The main issue with having src/dest being (yet another)
stack is that you have to undo the decision every time a packet is not
immediately accepted. Another problem is that we give the same packet (pointer)
to all snoopers and thus make one single packet diverge. If you don't use the
sender state you would have to take great care to figure out where to route the
packet.
Andreas
From: Erfan Azarkhish <[email protected]<mailto:[email protected]>>
Reply-To: gem5 users mailing list
<[email protected]<mailto:[email protected]>>
Date: Thursday, 27 June 2013 16:59
To: gem5 users mailing list <[email protected]<mailto:[email protected]>>
Subject: Re: [gem5-users] A Quick Question
Dear Andreas,
Thank you for your hint,
I noticed that inside the Packet class, the field "dest" is only an integer, so
packet can not keep a history of its whole routing path, and therefore
multi-hop routing is not possible in current version of gem5. (Is this correct?)
Do you think if I add a data-structure such as stack to the Packet class, I
would be able to route back the response over multiple hops?
It might be a starting point for supporting connection of multiple
interconnects in gem5.
Best Regards,
On Wed, Jun 26, 2013 at 4:07 PM, Andreas Hansson
<[email protected]<mailto:[email protected]>> wrote:
Hi Erfan,
Today you cannot connect two buses directly to each other. You will need to
either insert a cache or bridge in between.
The error you see seems to suggest you have connected two ports on the buses to
each other (which is causing the multiple-range issue).
Andreas
From: Erfan Azarkhish <[email protected]<mailto:[email protected]>>
Reply-To: gem5 users mailing list
<[email protected]<mailto:[email protected]>>
Date: Wednesday, 26 June 2013 15:02
To: gem5 users <[email protected]<mailto:[email protected]>>
Subject: [gem5-users] A Quick Question
Dear All,
I wanted to know if it is possible to connect two buses to each other. When I
create the following topology:
Processor ---> MemBus1 ---> MemBus2 ---> SimpleMemory
I get the following error:
fatal: system.membus
1
has two ports with same range:
system.
membus2.slave[0]
system.
membus2.slave[0]
I
want to make a complex topology and I need to connect the buses to each other
T
hanks
--
Erfan Azarkhish
Micrel Lab - Viale Carlo Pepoli 3/2 - 40123, Bologna
DEIS - University of Bologna, Italy
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Erfan Azarkhish
Micrel Lab - Viale Carlo Pepoli 3/2 - 40123, Bologna
DEIS - University of Bologna, Italy
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