Hi Andreas, Many thanks for your reply! You help me a lot! And now I have another question, how can I change the latency of the bus? I have searched the parameters of the bus but there is no latency? Is that possible to change the bus latency?
Many thanks! Lu 2013/8/27 Andreas Hansson <[email protected]> > Hi Lu, > > There are obviously many ways of achieving a bandwidth of 5GByte/s, but > one example would be to set --sys-clock to 700 Mhz (~1.43 ns per clock > period), and assuming 64 byte transactions you would then get 64 / 8 + 1 > cycles per transaction, hence 64 bytes per 9 cycles or ~12.86 ns, which > gives you ~4.98 Gbyte/s. > > Note that the bus is effectively a crossbar, so you have this bandwidth > per master/slave pair. > > Andreas > > From: Lu Bai <[email protected]> > Reply-To: gem5 users mailing list <[email protected]> > Date: Tuesday, August 27, 2013 9:42 PM > To: gem5 users mailing list <[email protected]> > Subject: [gem5-users] how to change the speed of bus > > Hi all, > > I'm trying to modify the speed of bus. I'm running the benchmark on full > system mode, and the bus speed I need is 5GB/s. > > In the "Bus.py" file, there are only two parameters that can be modified: > > header_cycles=Param.Cycles(1, "cycles of overhead per transaction") > width=Param.Unsigned (8, "bus width(bytes)") > > Can anyone tell me that is that possible to get a bus with speed of 5GB/s > by modifying the "Bus.py"? > > Thanks in advance, > > Lu > > > > -- 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 >
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