On 2023/12/5 22:23, Juhyung Park wrote:
Hi Gao,
On Tue, Dec 5, 2023 at 4:32 PM Gao Xiang <hsiang...@linux.alibaba.com> wrote:
Hi Juhyung,
On 2023/12/4 11:41, Juhyung Park wrote:
...
- Could you share the full message about the output of `lscpu`?
Sure:
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Address sizes: 39 bits physical, 48 bits virtual
Byte Order: Little Endian
CPU(s): 8
On-line CPU(s) list: 0-7
Vendor ID: GenuineIntel
BIOS Vendor ID: Intel(R) Corporation
Model name: 11th Gen Intel(R) Core(TM) i7-1185G7 @ 3.00GHz
BIOS Model name: 11th Gen Intel(R) Core(TM) i7-1185G7 @ 3.00GHz None
CPU
@ 3.0GHz
BIOS CPU family: 198
CPU family: 6
Model: 140
Thread(s) per core: 2
Core(s) per socket: 4
Socket(s): 1
Stepping: 1
CPU(s) scaling MHz: 60%
CPU max MHz: 4800.0000
CPU min MHz: 400.0000
BogoMIPS: 5990.40
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mc
a cmov pat pse36 clflush dts acpi mmx fxsr sse sse2
ss
ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc
art
arch_perfmon pebs bts rep_good nopl xtopology
nonstop_
tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq
dtes6
4 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16
xt
pr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt
tsc_dead
line_timer aes xsave avx f16c rdrand lahf_lm abm
3dnowp
refetch cpuid_fault epb cat_l2 cdp_l2 ssbd ibrs ibpb
st
ibp ibrs_enhanced tpr_shadow flexpriority ept vpid
ept_
ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms
invpcid
rdt_a avx512f avx512dq rdseed adx smap avx512ifma
clfl
ushopt clwb intel_pt avx512cd sha_ni avx512bw
avx512vl
xsaveopt xsavec xgetbv1 xsaves split_lock_detect
dtherm
ida arat pln pts hwp hwp_notify hwp_act_window
hwp_epp
hwp_pkg_req vnmi avx512vbmi umip pku ospke
avx512_vbmi
2 gfni vaes vpclmulqdq avx512_vnni avx512_bitalg tme
av
x512_vpopcntdq rdpid movdiri movdir64b fsrm
avx512_vp2i
Sigh, I've been thinking. Here FSRM is the most significant difference between
our environments, could you only try the following diff to see if there's any
difference anymore? (without the previous disable patch.)
diff --git a/arch/x86/lib/memmove_64.S b/arch/x86/lib/memmove_64.S
index 1b60ae81ecd8..1b52a913233c 100644
--- a/arch/x86/lib/memmove_64.S
+++ b/arch/x86/lib/memmove_64.S
@@ -41,9 +41,7 @@ SYM_FUNC_START(__memmove)
#define CHECK_LEN cmp $0x20, %rdx; jb 1f
#define MEMMOVE_BYTES movq %rdx, %rcx; rep movsb; RET
.Lmemmove_begin_forward:
- ALTERNATIVE_2 __stringify(CHECK_LEN), \
- __stringify(CHECK_LEN; MEMMOVE_BYTES), X86_FEATURE_ERMS, \
- __stringify(MEMMOVE_BYTES), X86_FEATURE_FSRM
+ CHECK_LEN
/*
* movsq instruction have many startup latency
Yup, that also seems to fix it.
Are we looking at a potential memmove issue?
I'm still analyzing this behavior as well as the root cause and
I will also try to get a recent cloud server with FSRM myself
to find more clues.
Thanks,
Gao Xiang
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