Hi Prathap, Your write are probably arriving faster than the controller can actually send them to the DRAM. What is it you’re running?
Andreas From: gem5-users <gem5-users-boun...@gem5.org<mailto:gem5-users-boun...@gem5.org>> on behalf of Prathap Kolakkampadath <kvprat...@gmail.com<mailto:kvprat...@gmail.com>> Reply-To: gem5 users mailing list <gem5-users@gem5.org<mailto:gem5-users@gem5.org>> Date: Tuesday, 14 July 2015 17:27 To: gem5 users mailing list <gem5-users@gem5.org<mailto:gem5-users@gem5.org>> Subject: [gem5-users] Question on retry requests due to write queue full. Hello Users, I am using classic memory system with following DRAM controller parameters write_buffer_size = 64 write_high_thresh_perc = 85 write_low_thresh_perc = 50 min_writes_per_switch =18 According to write draining algorithm, the bus has to turn around to writes when the writeQueue.size() > writeHighThreshold. However when i run some memory intensive benchmarks, i get a high number of Write retry requests because the write queue is full, as reported in the gem5 statistics. # Number of times write queue was full causing retry system.mem_ctrls.numWrRetry 183731 I am not sure how this could happen, as the DRAM controller drain writes in a batch whenever the write queue size grows beyond the high threshold, which is only 85% of Write Buffer Size. Is this expected? 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
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