Andreas,
Below is the command line I am using.
./build/X86/gem5.opt --debug-flags=PatrickTLB,PatrickPageTableWalker
--debug-file=out ./configs/example/fs.py --cpu-type=timing --caches
--l2cache --mem-channels=4 -b boot
"boot" is a benchmark I added that initializes SysConfig to use 4GB of
memory (i.e. SysConfig('boot.rcS','4GB') ).
The "PatrickTLB" and "PatrickPageTableWalker" are debug flags I added, but
I assume they aren't relevant to my question here.
Any help is appreciated.
Regards,
Patrick
On Mon, Dec 8, 2014 at 11:09 AM, Andreas Hansson <andreas.hans...@arm.com>
wrote:
> 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>
> Reply-To: Patrick <plafr...@gmail.com>, gem5 users mailing list <
> gem5-users@gem5.org>
> Date: Monday, 8 December 2014 17:51
> To: gem5 users mailing list <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> 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
>> _______________________________________________
>> gem5-users mailing list
>> gem5-users@gem5.org
>> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
>>
>
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