Hi Abdul, The comm monitor does not count the cycles between the failed attempt and retry as part of the specific packet’s latency. It will calculate latency as time between the request successfully sent (the curTick then stored in CommMonitorSenderState as trasmitTime variable) and the response received. It should be easy enough to hack it to maintain a variable in Comm Mon to save the ‘sendFailedTick’, calculate the delay and add that to the latency calculated when response is received.
Radhika From: gem5-users [mailto:[email protected]] On Behalf Of Abdul Mutaal Sent: 01 May 2016 12:27 To: gem5 users mailing list Subject: Re: [gem5-users] Measuring latency & bandwidth accurately Hi Radhika, Thanks for your answer. My system consists of Traffic generator replaying some recorded traces. I would like to measure the latency & bandwidth of my system attached with traffic generator. Just a side question - After running the trace I see that there is stat called 'numRetries' and 'retryTicks' , which are the ticks wasted during back pressure. So my question is, does CommMonitor has the ability to count latency of packet if the packet experiences a back-pressure and retry is being done from traffic generator. Thanks 2016-04-29 9:42 GMT+02:00 Radhika Jagtap <[email protected]<mailto:[email protected]>>: Hi Abdul, What do you mean by certain architecture? As you may know, CommMonitor is connected between two ports and so it (reliably and accurately) measures the latency and bandwidth statistics of requests between those two ports. I you want to measure these as seen by the application, you could connect the CommMonitor between the core and L1 data cache ports. If you are looking for characterizing, that is things like maximum bandwidth and static latency (ie round trip latency per single request is in flight), then running lmbench benchmarks could be useful . Radhika From: gem5-users [mailto:[email protected]<mailto:[email protected]>] On Behalf Of Abdul Mutaal Sent: 25 April 2016 22:20 To: gem5 users mailing list Subject: [gem5-users] Measuring latency & bandwidth accurately Hi, How can I accurately measure bandwidth & latency of certain architecture ? I am currently using CommMonitor. Is that reliable or is there any other method to measure accurately in gem5. Thanks -- Regards, Abdul Mutaal 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. _______________________________________________ gem5-users mailing list [email protected]<mailto:[email protected]> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users -- Regards, Abdul Mutaal 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.
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