Hello Andreas, I think that could b the case.
I am running a very memory intensive synthetic benchmark, in every memory operation generates a read and write to DRAM. Thanks, Prathap On Tue, Jul 14, 2015 at 12:39 PM, Andreas Hansson <andreas.hans...@arm.com> wrote: > 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> on behalf of Prathap > Kolakkampadath <kvprat...@gmail.com> > Reply-To: gem5 users mailing list <gem5-users@gem5.org> > Date: Tuesday, 14 July 2015 17:27 > To: gem5 users mailing list <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 > > _______________________________________________ > gem5-users mailing list > gem5-users@gem5.org > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >
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