Re: ILP32 for ARM64 - testing with lmbench

From: Zhangjian (Bamvor)
Date: Mon Dec 05 2016 - 05:18:02 EST

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Hi, Catalin, Guys

Do you have suggestion of next move of upstreaming ILP32?
There are already the test results of lmbench and specint. Do you they are ok or need more data to prove no regression?
I have also noticed that there are ILP32 failures in glibc testsuite. Is it the only blocker for merge ILP32(in technology part)?

We appreciate any feedback/suggestion and hope could collaborate to improve the upstream progress.

(cc libc-alpha to get more input).

Thanks

Bamvor

On 2016/11/17 15:48, Zhangjian (Bamvor) wrote:

Hi, Maxim

On 2016/11/17 13:02, Maxim Kuvyrkov wrote:

Hi Bamvor,

I'm surprised that you see this much difference from ILP32 patches on SPEC CPU2006int at all. The SPEC CPU2006 benchmarks spend almost no time in the kernel syscalls. I can imagine memory, TLB,
and cache handling in the kernel could affect CPU2006 benchmarks. Do ILP32 patches touch code in those areas?

Other than that, it would be interesting to check what the variance is between the 3 iterations of benchmark runs. Could you check what relative standard deviation is between the 3 iterations --
(STDEV(RUN1, RUN2, RUN3) / RUNselected)?

For reference, in my [non-ILP32] benchmarking I see 1.1% for 401.bzip2, 0.8% for 429.mcf, 0.2% for 456.hmmer, and 0.1% for 462.libquantum.

Here is my result:
ILP32_merged ILP32_unmerged
401.bzip2 0.31% 0.26%
429.mcf 1.61% 1.36%
456.hmmer 1.37% 1.57%
462.libquantum 0.29% 0.28%

Regards

Bamvor

--
Maxim Kuvyrkov
www.linaro.org

On Nov 17, 2016, at 7:28 AM, Zhangjian (Bamvor) <bamvor.zhangjian@xxxxxxxxxx> wrote:

Hi, all

I test specint of aarch64 LP64 when aarch32 el0 disable/enabled respectively
and compare with ILP32 unmerged kernel(4.8-rc6) in our arm64 board. I found
that difference(ILP32 disabled/ILP32 unmerged) is bigger when aarch32 el0 is
enabled, compare with aarch32 el0 disabled kernel. And bzip2, mcg, hmmer,
libquantum are the top four differences[1]. Note that bigger is better in
specint test.

In order to make sure the above results, I retest these four testcases in
reportable way(reference the command in the end). The result[2] show that
libquantum decrease -2.09% after ILP32 enabled and aarch32 on. I think it is in
significant.

The result of lmbench is not stable in my board. I plan to dig it later.

[1] The following test result is tested through --size=ref --iterations=3.
1.1 Test when aarch32_el0 is enabled.
ILP32 disabled base line
400.perlbench 100.00% 100%
401.bzip2 99.35% 100%
403.gcc 100.26% 100%
429.mcf 102.75% 100%
445.gobmk 100.00% 100%
456.hmmer 95.66% 100%
458.sjeng 100.00% 100%
462.libquantum 100.00% 100%
471.omnetpp 100.59% 100%
473.astar 99.66% 100%
483.xalancbmk 99.10% 100%

1.2 Test when aarch32_el0 is disabled
ILP32 disabled base line
400.perlbench 100.22% 100%
401.bzip2 100.95% 100%
403.gcc 100.20% 100%
429.mcf 100.76% 100%
445.gobmk 100.36% 100%
456.hmmer 97.94% 100%
458.sjeng 99.73% 100%
462.libquantum 98.72% 100%
471.omnetpp 100.86% 100%
473.astar 99.15% 100%
483.xalancbmk 100.08% 100%

[2] The following test result is tested through: runspec --config=my.cfg --size=test,train,ref --noreportable --tune=base,peak --iterations=3 bzip2 mcf hmmer libquantum
2.1 Test when aarch32_el0 is enabled.
ILP32_enabled base line
401.bzip2 100.82% 100%
429.mcf 100.18% 100%
456.hmmer 99.64% 100%
462.libquantum 97.91% 100%

Regards

Bamvor

On 2016/10/28 20:46, Yury Norov wrote:

[Add Steve Ellcey, thanks for testing on ThunderX]

Lmbench-3.0-a9 testing is performed on ThunderX machine to check that
ILP32 series does not add performance regressions for LP64. Test
summary is in the table below. Our measurements doesn't show
significant performance regression of LP64 if ILP32 code is merged,
both enabled or disabled.

ILP32 enabled ILP32 disabled Standard Kernel
null syscall 0.1066 0.1121 0.1121
95.09% 100.00%

stat 1.3947 1.3814 1.3864
100.60% 99.64%

fstat 0.4459 0.4344 0.4524
98.56% 96.02%

open/close 4.0606 4.0411 4.0453
100.38% 99.90%

read 0.4819 0.5014 0.5014
96.11% 100.00%

Tested with linux 4.8 because 4.9-rc1 is not fixed yet for ThunderX.
Other system details below.

Yury.

ubuntu@crb6:~$ uname -a
Linux crb6 4.8.0+ #3 SMP Thu Oct 27 11:01:32 PDT 2016 aarch64 aarch64 aarch64 GNU/Linux

ubuntu@crb6:~$ cat /proc/meminfo
MemTotal: 132011948 kB
MemFree: 131442672 kB
MemAvailable: 130695764 kB
Buffers: 15696 kB
Cached: 88088 kB
SwapCached: 0 kB
Active: 82760 kB
Inactive: 41336 kB
Active(anon): 20880 kB
Inactive(anon): 8576 kB
Active(file): 61880 kB
Inactive(file): 32760 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 128920572 kB
SwapFree: 128920572 kB
Dirty: 0 kB
Writeback: 0 kB
AnonPages: 20544 kB
Mapped: 19780 kB
Shmem: 9060 kB
Slab: 78804 kB
SReclaimable: 27372 kB
SUnreclaim: 51432 kB
KernelStack: 8336 kB
PageTables: 820 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 194926544 kB
Committed_AS: 256324 kB
VmallocTotal: 135290290112 kB
VmallocUsed: 0 kB
VmallocChunk: 0 kB
AnonHugePages: 0 kB
ShmemHugePages: 0 kB
ShmemPmdMapped: 0 kB
CmaTotal: 0 kB
CmaFree: 0 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB

ubuntu@crb6:~$ cat /proc/cpuinfo
processor : 0
BogoMIPS : 200.00
Features : fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics
CPU implementer : 0x43
CPU architecture: 8
CPU variant : 0x1
CPU part : 0x0a1
CPU revision : 0

processor : 1
BogoMIPS : 200.00
Features : fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics
CPU implementer : 0x43
CPU architecture: 8
CPU variant : 0x1
CPU part : 0x0a1
CPU revision : 0

processor : 2
BogoMIPS : 200.00
Features : fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics
CPU implementer : 0x43
CPU architecture: 8
CPU variant : 0x1
CPU part : 0x0a1
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processor : 3
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Features : fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics
CPU implementer : 0x43
CPU architecture: 8
CPU variant : 0x1
CPU part : 0x0a1
CPU revision : 0

processor : 4
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Features : fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics
CPU implementer : 0x43
CPU architecture: 8
CPU variant : 0x1
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processor : 5
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Features : fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics
CPU implementer : 0x43
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CPU variant : 0x1
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