Hi Peng,
If you have a look at the config.ini/json you will see that the CLCD is a PL111
Color LCD controller
(http://infocenter.arm.com/help/topic/com.arm.doc.ddi0293c/DDI0293.pdf).
In a scenario where the CPU is running Bbench, it is not consuming much
bandwidth, and I don’t think it is too strange that the main bandwidth consumer
is the LCD. The only impact you should see from the LCD is a slight increase in
the CPU load-to-use latency, but I doubt it is noticeable. If you’re using the
default DDR3 config, then you’re probably using ~2% of the available 12.8
Gbyte/s.
Andreas
From: Peng Wei <[email protected]<mailto:[email protected]>>
Reply-To: gem5 users mailing list
<[email protected]<mailto:[email protected]>>
Date: Saturday, 8 March 2014 03:48
To: gem5 users mailing list <[email protected]<mailto:[email protected]>>
Subject: [gem5-users] Question about the "Realview.CLCD" in gem5's statistical
files
Hi there,
I tried to run ARM Android full-system in gem5, ran some BBench and Asimbench
applications, and observed the influence of off-chip memory accesses on
performance. However, when I checked the statistics files of gem5, I found the
majority of memory accesses are from "realview.clcd". It takes up to 90% of the
whole accesses, which is really significant.
However, I do not even know what the "realview.clcd" is and how it works. I
googled it on the internet and found that the realview seemed to be a platform.
I am still quite confused about what it is and what it is for, especially why
it takes so large percentage of the whole off-chip memory accesses. Is it
necessary and does it make a huge influence on the total performance of the
applications?
I wish that some ones could help me clarify that term, and its influence on
simulation.
Thanks very much.
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