Hi Davesh,
1. Yes. 2. If we find a row-hit that can be performed seamlessly we stop the iteration. In all other cases, we iterate over the entire queue. The selection is guided by minBankPrep. 3. Bank parallelism is achieved by looking at the requests to all banks. Try running build/NULL/gem5.opt –r configs/dram/sweep.py, and then util/dram_sweep_plot.py m5out, this will show you how good the controller is at using bank parallelism. Andreas From: gem5-users <gem5-users-boun...@gem5.org<mailto:gem5-users-boun...@gem5.org>> on behalf of Davesh Shingari <shingaridav...@gmail.com<mailto:shingaridav...@gmail.com>> Reply-To: gem5 users mailing list <gem5-users@gem5.org<mailto:gem5-users@gem5.org>> Date: Thursday, 23 July 2015 23:21 To: gem5 users mailing list <gem5-users@gem5.org<mailto:gem5-users@gem5.org>> Subject: [gem5-users] [DRAM] FRFCFS: Reordering Request Queue & Bank Parallelism Hi I am having few doubts in FRFCFS implementation. Please help in clarifying the same. As per my understanding "processNextReqEvent" calls "chooseNext" which calls "reorderQueue" and then returns back and then calls "doDRAMAccess". The reoderQueue and hence chooseNext return a bool value found_packet and once it is true, then doDRAMAcess acts on the front packet of the queue. My question is: Q.1: So reorderQueue brings the packet to the front of the queue on basis of FRFCFS logic? Q.2: If not then what does it do? If yes, then how is it doing. As per my understanding we should traverse the WHOLE queue and look at the request which have openRow in the banks, and service them. But in the implementation I see that we look at whether there is openRow or not. If not then we call minBankPrep. I could not completely understand what minBankPrep do. Does it reorder the queue? Q.3: How is bank parallelism achieved in Gem5. I am having hard time figuring out how requests associated with different banks are processed in parallel? Any guidance will be highly appreciated. -- Have a great day! Thanks and Warm Regards Davesh Shingari Master's in Computer Engineering [EE] Arizona State University davesh.shing...@asu.edu<mailto:davesh.shing...@asu.edu> [https://mailfoogae.appspot.com/t?sender=ac2hpbmdhcmlkYXZlc2hAZ21haWwuY29t&type=zerocontent&guid=69cae66c-386f-43ee-a690-bf0753bec2cf]ᐧ -- 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
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