[gem5-users] about memory configuration

[류정민]

Hi, I am working on modifying the memory configuration in gem5 simulator.

I found that src/mem/DRAMCtrl.py controls the overall configuration of gem5
memory system.

However, I can't understand the meaning of the term 'device'.

For instance, DDR3 has device_size parameter and there are much more
important parameters related to the 'device' term.

I guess it is as same as 'chip', but I am not sure.

If you have any knowledge about the parameter 'device', please give me an
advise.

Best regards,

Jung Min.

[Wendy Elsasser]

Hi Jung Min,
The term ‘device’ represents a DRAM chip.

As an example, DDR3 DIMM solutions typically have a 64-bit interface and are comprised of multiple DRAM chips.

If the device_bus_width = 8, each device has 8 data pins and there will be 8 devices required for the 64-bit interface. Therefore, devices_per_rank = 8 for this case.
If the devices are 8Gbit devices, the device_size = 1GB and the overall DIMM capacity per rank is 8GB.

Please let me know if you have any more questions or if this is still unclear.

Regards,
Wendy

From: gem5-users <gem5-users-***@gem5.org> on behalf of 류정믌 <***@gmail.com>
Reply-To: gem5 users mailing list <gem5-***@gem5.org>
Date: Friday, September 28, 2018 at 1:38 AM
To: gem5 users mailing list <gem5-***@gem5.org>
Subject: [gem5-users] about memory configuration

Hi, I am working on modifying the memory configuration in gem5 simulator.

I found that src/mem/DRAMCtrl.py controls the overall configuration of gem5 memory system.

However, I can't understand the meaning of the term 'device'.

For instance, DDR3 has device_size parameter and there are much more important parameters related to the 'device' term.

I guess it is as same as 'chip', but I am not sure.

If you have any knowledge about the parameter 'device', please give me an advise.

Best regards,

Jung Min.
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.

[류정민]

Thanks Wendy!

It helped me a lot.

Regards,

Jung Min.

Post by Wendy Elsasser
Hi Jung Min,
The term ‘device’ represents a DRAM chip.
As an example, DDR3 DIMM solutions typically have a 64-bit interface and
are comprised of multiple DRAM chips.
If the device_bus_width = 8, each device has 8 data pins and there will be
8 devices required for the 64-bit interface. Therefore, devices_per_rank =
8 for this case.
If the devices are 8Gbit devices, the device_size = 1GB and the overall
DIMM capacity per rank is 8GB.
Please let me know if you have any more questions or if this is still unclear.
Regards,
Wendy
*Date: *Friday, September 28, 2018 at 1:38 AM
*Subject: *[gem5-users] about memory configuration
Hi, I am working on modifying the memory configuration in gem5 simulator.
I found that src/mem/DRAMCtrl.py controls the overall configuration of gem5 memory system.
However, I can't understand the meaning of the term 'device'.
For instance, DDR3 has device_size parameter and there are much more
important parameters related to the 'device' term.
I guess it is as same as 'chip', but I am not sure.
If you have any knowledge about the parameter 'device', please give me an advise.
Best regards,
Jung Min.
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
http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users