[gem5-users] Re: Duplicate net_msg_ptr values

[Bharadwaj, Srikant via gem5-users]

Hi Navneet,
In addition to the possibility of a broadcast, you should note that a message 
may also be reused by cache controllers in certain protocols. It would mean 
that the same message will be seen by a L1 network interface and then by L2 
network interface later if it misses on both.
Also, multiple flits from the same packet will have same message pointer so 
make sure you are not checking it for each flit of the same packet.

Thanks,
Srikant

From: Krishna, Tushar via gem5-users <gem5-users@gem5.org>
Sent: Wednesday, April 28, 2021 3:14 PM
To: gem5 users mailing list <gem5-users@gem5.org>
Cc: NAVNEET KUMAR <k.navn...@iitg.ac.in>; Krishna, Tushar 
<tus...@ece.gatech.edu>
Subject: [gem5-users] Re: Duplicate net_msg_ptr values

[CAUTION: External Email]
There might be a broadcast happening which NetworkInterface.cc breaks into 
several unicasts. Depends on the protocol you are running.

Best,
Tushar
On Apr 28, 2021, 2:23 PM -0400, NAVNEET KUMAR via gem5-users 
<gem5-users@gem5.org<mailto:gem5-users@gem5.org>>, wrote:

Hello,  gem5 community,
 In file gem5/src/mem/ruby/network/garnet2.0/networkinterface.cc, in function 
flitisizeMessage() I printed the net_msg_ptr which is a pointer to the message 
class. But many times the value of net_msg_ptr repeated.  I did not expect 
that, I was assuming that for every network packet, the net_msg_ptr value is 
unique. Can you please give me some brief idea, why is that happening?
....
Thank you,
NAVNEET


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