From: Wolf Ruediger Spielmann <RSpielmann@gmx.de>
To: sparclinux@vger.kernel.org
Subject: SMP is broken on sparc64 with kernel 4.x/5.x
Date: Fri, 09 Oct 2020 14:19:24 +0000 [thread overview]
Message-ID: <20201009161924.c8f031c079dd852941307870@gmx.de> (raw)
Hi @all,
I freshly installed linux on my SUN Ultra 60 /w 2x 450MHz CPUs.
First I tested kernel 5.8.x and couldn't get SMP to work on both CPUs - just the first CPU will be activated.
Same results with kernel 4.19.146 .
Kernel 3.18.140 runs perfectly on both CPUs.
Might be the problem that the CPUs numbering scheme is not linear:
CPU1 is #0 and CPU2 is #2 (NOT #1)
Below you find some infos.
With kernel 5.8.14 (also tested 5.4.66 and 4.19.146) :
dmesg (cutted)
[ 0.000335] Linux version 5.8.14-gentoo (root@compilenode1) (sparc64-unknown-linux-gnu-gcc (Gentoo Hardened 9.3.0-r1 p3) 9.3.0, GNU ld (Gentoo 2.34 p6) 2.34.0) #2 SMP Thu Oct 8 10:40:33 CEST 2020
...
[ 0.918138] percpu: Embedded 10 pages/cpu s42648 r8192 d31080 u2097152
[ 0.942080] pcpu-alloc: s42648 r8192 d31080 u2097152 alloc=1*4194304
[ 0.942090] pcpu-alloc: [0] 0 1
...
[ 1.252126] rcu: Hierarchical RCU implementation.
[ 1.268124] rcu: RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=2.
[ 1.288896] rcu: RCU calculated value of scheduler-enlistment delay is 100 jiffies.
[ 1.312586] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2
[ 1.334035] NR_IRQS: 2048, nr_irqs: 2048, preallocated irqs: 1
...
[ 1.532316] Calibrating delay using timer specific routine.. 905.89 BogoMIPS (lpj=452945)
...
[ 1.539394] rcu: Hierarchical SRCU implementation.
[ 1.540102] smp: Bringing up secondary CPUs ...
[ 1.540120] smp: Brought up 1 node, 1 CPU
########
ultra60-1 ~ # lscpu
Architecture: sparc64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Big Endian
CPU(s): 1
On-line CPU(s) list: 0
Thread(s) per core: 1
Core(s) per socket: 1
Socket(s): 1
NUMA node(s): 1
Model name: TI UltraSparc II (BlackBird)
NUMA node0 CPU(s): 0
Flags: sun4u
########
ultra60-1 ~ # cat /proc/cpuinfo
cpu : TI UltraSparc II (BlackBird)
fpu : UltraSparc II integrated FPU
pmu : ultra12
prom : OBP 3.31.0 2001/07/25 20:31
type : sun4u
ncpus probed : 2
ncpus active : 1
D$ parity tl1 : 0
I$ parity tl1 : 0
cpucaps : flush,stbar,swap,muldiv,v9,mul32,div32,v8plus,vis
Cpu0ClkTck : 000000001ad38c39
MMU Type : Spitfire
MMU PGSZs : 8K,64K,512K,4MB
State:
CPU0: online
########
ultra60-1 ~ # cat /sys/devices/system/cpu/offline
1
ultra60-1 ~ # cat /sys/devices/system/cpu/online
0
#################################################################
With kernel 3.18.140
dmesg (cutted)
[ 0.000000] PROMLIB: Sun IEEE Boot Prom 'OBP 3.31.0 2001/07/25 20:31'
...
[ 0.000000] Linux version 3.18.140 (root@compilenode1) (gcc version 9.3.0 (Gentoo Hardened 9.3.0-r1 p3) ) #7 SMP Thu Oct 8 15:37:47 CEST 2020
...
[ 0.000000] PERCPU: Embedded 8 pages/cpu @fffff800bf800000 s21760 r8192 d35584 u2097152
[ 0.000000] pcpu-alloc: s21760 r8192 d35584 u2097152 alloc=1*4194304
[ 0.000000] pcpu-alloc: [0] 0 2
...
[ 0.000000] Hierarchical RCU implementation.
[ 0.000000] RCU restricting CPUs from NR_CPUS=4 to nr_cpu_ids=3.
[ 0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=3
[ 0.000000] NR_IRQS:2048 nr_irqs:2048 1
...
[ 82.644201] CPU 2: synchronized TICK with master CPU (last diff 0 cycles, maxerr 535 cycles)
[ 82.644302] Brought up 2 CPUs
########
ultra60-1 ~ # lscpu
Architecture: sparc64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Big Endian
CPU(s): 2
On-line CPU(s) list: 0,2
Thread(s) per core: 1
Core(s) per socket: 1
Socket(s): 2
NUMA node(s): 1
Model name: TI UltraSparc II (BlackBird)
NUMA node0 CPU(s): 0-3
Flags: sun4u
########
ultra60-1 ~ # cat /proc/cpuinfo
cpu : TI UltraSparc II (BlackBird)
fpu : UltraSparc II integrated FPU
pmu : ultra12
prom : OBP 3.31.0 2001/07/25 20:31
type : sun4u
ncpus probed : 2
ncpus active : 2
D$ parity tl1 : 0
I$ parity tl1 : 0
cpucaps : flush,stbar,swap,muldiv,v9,mul32,div32,v8plus,vis
Cpu0ClkTck : 000000001ad37db2
Cpu2ClkTck : 000000001ad37db2
MMU Type : Spitfire
MMU PGSZs : 8K,64K,512K,4MB
State:
CPU0: online
CPU2: online
########
ultra60-1 ~ # cat /sys/devices/system/cpu/offline
ultra60-1 ~ # cat /sys/devices/system/cpu/online
0,2
best regards,
Rüdiger
next reply other threads:[~2020-10-09 14:19 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-09 14:19 Wolf Ruediger Spielmann [this message]
2020-10-09 14:30 ` SMP is broken on sparc64 with kernel 4.x/5.x John Paul Adrian Glaubitz
2020-10-09 14:40 ` Wolf Ruediger Spielmann
2020-10-09 14:49 ` John Paul Adrian Glaubitz
2020-10-09 15:50 ` Wolf Ruediger Spielmann
2020-10-09 20:46 ` Wolf Ruediger Spielmann
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