Hi Prathap, 100 was chosen to be “sufficiently infinite”, and only break if something is wrong.
The caches have a limited number of MSHRs, the cores have limited LSQ depth etc. We could easily add an outstanding transaction limit to the crossbar class. In the end it is a detail/speed trade-off. If it does not matter, do not model it… Andreas From: gem5-users <[email protected]<mailto:[email protected]>> on behalf of Prathap Kolakkampadath <[email protected]<mailto:[email protected]>> Reply-To: gem5 users mailing list <[email protected]<mailto:[email protected]>> Date: Monday, 27 July 2015 15:15 To: gem5 users mailing list <[email protected]<mailto:[email protected]>> Subject: Re: [gem5-users] How queued port is modelled in real platforms? Hello Andreas, Currently, the reasonable limit of this queue is set to 100. Is there a specific reason to choose this as the maximum packet queue size. Do any bus interface protocol specifies this limit in real platforms? Thanks, Prathap On Mon, Jul 27, 2015 at 4:54 AM, Andreas Hansson <[email protected]<mailto:[email protected]>> wrote: Hi Prathap, The queued port is indeed infinite, and is a convenience construct. It should only be used in places where there is already an inherent limit to the number of outstanding requests. There is an assert in the queued port to ensure things do not grow uncontrollably. Andreas From: gem5-users <[email protected]<mailto:[email protected]>> on behalf of Prathap Kolakkampadath <[email protected]<mailto:[email protected]>> Reply-To: gem5 users mailing list <[email protected]<mailto:[email protected]>> Date: Sunday, 26 July 2015 18:34 To: gem5 users mailing list <[email protected]<mailto:[email protected]>> Subject: [gem5-users] How queued port is modelled in real platforms? Hell Users, Gem5 implements a queued port to interface memory objects. In my understanding this queued port is of infinite size. Is this specific to Gem5 implementation? How packets are handled in real hardware if the request rate of a layer is faster than the service rate of underlying layer? It would be great if someone could help me in understanding this. Thanks, Prathap -- IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. ARM Limited, Registered office 110 Fulbourn Road, Cambridge CB1 9NJ, Registered in England & Wales, Company No: 2557590 ARM Holdings plc, Registered office 110 Fulbourn Road, Cambridge CB1 9NJ, Registered in England & Wales, Company No: 2548782 _______________________________________________ gem5-users mailing list [email protected]<mailto:[email protected]> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users -- IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. ARM Limited, Registered office 110 Fulbourn Road, Cambridge CB1 9NJ, Registered in England & Wales, Company No: 2557590 ARM Holdings plc, Registered office 110 Fulbourn Road, Cambridge CB1 9NJ, Registered in England & Wales, Company No: 2548782
_______________________________________________ gem5-users mailing list [email protected] http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
