My first approach for debug would be this:
-n 8
=> this configures gem5 system model to have 8 cores
=> you should see 8 cores in your config.ini file in output directory!
Everything should be as expected till this point!
However, the kernel needs to support as well as be aware of 8 core
configuration
=> Check if your dtb file (vexpress.aarch64.20140821.dtb) corresponds to
4 core configuration!
=> This is easy to check if you have either proper documentation or the
source dts file that was used to generate this dtb file. Otherwise, I am
not sure how you can check that.
On 01/27/15 23:39, Zehan Cui via gem5-users wrote:
Hello everyone,
I have download the latest aarch64 binary and disk image from this
link
(http://www.gem5.org/dist/current/arm/aarch-system-2014-10.tar.xz).
The command line I'm using is:
build/ARM/gem5.fast configs/example/fs.py
--kernel=vmlinux.aarch64.20140821
--disk-image=aarch64-ubuntu-trusty-headless.img
--dtb-filename=vexpress.aarch64.20140821.dtb
--machine-type=VExpress_EMM64 --caches --l2cache --l3cache
--l1d_size=32kB --l1i_size=32kB --l2_size=256kB --l3_size=16MB -n 8
However, I can only see four cores:
[ 0.000000] Virtual kernel memory layout:
[ 0.000000] vmalloc : 0xffffff8000000000 - 0xffffffbbffff0000
(245759 MB)
[ 0.000000] vmemmap : 0xffffffbc01c00000 - 0xffffffbc02300000
( 7 MB)
[ 0.000000] modules : 0xffffffbffc000000 - 0xffffffc000000000
( 64 MB)
[ 0.000000] memory : 0xffffffc000000000 - 0xffffffc020000000
( 512 MB)
[ 0.000000] .init : 0xffffffc000692000 - 0xffffffc0006c6200
( 209 kB)
[ 0.000000] .text : 0xffffffc000080000 - 0xffffffc0006914e4
( 6214 kB)
[ 0.000000] .data : 0xffffffc0006c7000 - 0xffffffc0007141e0
( 309 kB)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
[ 0.000000] Preemptible hierarchical RCU implementation.
[ 0.000000] RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=4.
[ 0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=16,
nr_cpu_ids=4
[ 0.000000] NR_IRQS:64 nr_irqs:64 0
[ 0.000000] Architected cp15 timer(s) running at 100.00MHz (phys).
[ 0.000002] sched_clock: 56 bits at 100MHz, resolution 10ns, wraps
every 2748779069440ns
[ 0.000068] Console: colour dummy device 80x25
[ 0.000072] Calibrating delay loop (skipped) preset value.. 3997.69
BogoMIPS (lpj=19988480)
[ 0.000076] pid_max: default: 32768 minimum: 301
[ 0.000110] Mount-cache hash table entries: 1024 (order: 1, 8192 bytes)
[ 0.000114] Mountpoint-cache hash table entries: 1024 (order: 1,
8192 bytes)
[ 0.000402] hw perfevents: no hardware support available
[ 0.060098] CPU1: Booted secondary processor
[ 0.080101] CPU2: Booted secondary processor
[ 0.100108] CPU3: Booted secondary processor
[ 0.100130] Brought up 4 CPUs
[ 0.100138] SMP: Total of 4 processors activated.
Does anyone know how to bring up 8 cores?
Thanks,
Zehan
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