Patrick,
Could you elaborate on the command line you are using when experiencing this
error?
Thanks,
Andreas
From: Patrick via gem5-users <gem5-users@gem5.org<mailto:gem5-users@gem5.org>>
Reply-To: Patrick <plafr...@gmail.com<mailto:plafr...@gmail.com>>, gem5 users
mailing list <gem5-users@gem5.org<mailto:gem5-users@gem5.org>>
Date: Monday, 8 December 2014 17:51
To: gem5 users mailing list <gem5-users@gem5.org<mailto:gem5-users@gem5.org>>
Subject: Re: [gem5-users] Why does gem5 create twice the number of memory
controllers and simulate 1GB memory more while sepecified memory size is
greater than 3GB
Sandnon,
When I try to run with > 3GB, I get an error message saying:
"panic: Cannot test intersection of interleaved range [0x100000000 :
0x13fffffff], [14 : 13] = 1"
Were you able to get around this somehow, or did you not see this?
Any help is appreciated.
Regards,
Patrick
On Tue, Oct 14, 2014 at 8:51 PM, sandnon via gem5-users
<gem5-users@gem5.org<mailto:gem5-users@gem5.org>> wrote:
Hi all,
When I ran full system mode of gem5 with --mem-size=4GB and
--disk-image=/dist/m5/system/disks/linux-x86.img, it gave me a warn message that
> warn: Physical memory size specified is 4GB which is greater than 3GB. Twice
> the number of memory controllers would be created.
And the slave terminal said
> Memory: 4043292k/5242880k available (3742k kernel code, 150376k reserved,
> 1874k data, 232k init)
It seems gem5 simulated 5GB for me while I requested for 4GB.
I searched it and found a
[changeset](http://repo.gem5.org/gem5?cmd=changeset;node=fae4550d2103) which
said
> On the PC platform, the memory region 0xC0000000-0xFFFFFFFF is reserved for
> various devices. Hence, if the physical memory size is greater than 3GB, we
> need to split it into two parts.
I still have no idea why gem5 do that even I saw the comments aforementioned. I
know linux kernel will reserve 0xC0000000-0XFFFFFFFF virtual address for
kernel. But I'm not sure if it is related.
I conclude my questions again
- Why does gem5 create twice the number of memory controllers while physical
memory size is greater than 3GB
- Why does gem5 simulate 1GB memory more while specified memory size is
greater than 3GB
---
Sincerely,
Sandnon
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