Mohammad, how long does it take for your simulation to hit this problem?
If it takes about 10 minutes, I suggest that you come over to the CS
building so that I can take a look at your setup.
--
Nilay
On Sat, 24 Jan 2015, Mohammad Alian wrote:
After digging into the issue, I found out that ruby actually doesn't
cache memory requests within memory mapped devices address
range(0xC0000000-0xFFFFFFFF) and send them to the pio port. The problem
is that when I run gem5 with ruby, some of memory requests which their
address is not belong to the reserved memory region for devices reach
the iobus and PCI configspace after going through ruby! However no
memory request beyond the reserved memory space reaches to the PCI
configspace when I use classic memory system. Bellow is the gem5 output
and command line. The address of request that reaches PCI configspace is
"0x13f21e9c0". I've added 1GB extra memory to ruby memory size based on
this post https://www.mail-archive.com/[email protected]/msg11106.html
to be able to use ruby for memory size larger than 3GB. command line:
./gem5.opt --debug-flags=PciConfigAll configs/example/fs.py
--mem-size=4096MB --num-cpus=1 --cpu-type=timing --ruby -r 1
**** REAL SIMULATION ****
2379481334283000: system.pc.pciconfig: read va=0x13f21e9c0 size=16
panic: invalid access size(?) for PCI configspace!
@ tick 2379481334283000
[read:build/X86/dev/pciconfigall.cc, line 72]
Memory Usage: 5253512 KBytes
Program aborted at cycle 2379481334283000
Aborted (core dumped)
Any idea about what is going on here and possible fixes?
Thank you,Mohammad
On Thursday, January 22, 2015 10:28 AM, Mohammad Alian via gem5-dev
<[email protected]> wrote:
Hello,
How can I force a request to be uncacheable when using Ruby memory
system?"req->setFlags(Request::UNCACHEABLE)" works for classic memory system
but it doesn't have any effect on the request while using Ruby.
Thank you,Mohammad
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