Re: volk questions

Hi Johannes,

Thanks for your response !

> first off, we'd need to know a bit more about your setup. Could you share
> the versions of VOLK and your host system, e.g. OS, version, etc.
> Furthermore, do you use a VM, a container, or smth like this?

VOLK was 2.5.0, now upgraded to 3.0.0, same results.
No VM, container, etc used.

Machine info:

zita1 (desktop)

fons@zita1:~> lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Address sizes: 36 bits physical, 48 bits virtual
Byte Order: Little Endian
CPU(s): 4
On-line CPU(s) list: 0-3
Vendor ID: GenuineIntel
Model name: Intel(R) Core(TM) i5-3470 CPU @ 3.20GHz
CPU family: 6
Model: 58
Thread(s) per core: 1
Core(s) per socket: 4
Socket(s): 1
Stepping: 9
CPU(s) scaling MHz: 45%
CPU max MHz: 3600.0000
CPU min MHz: 1600.0000
BogoMIPS: 6387.26
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall
nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl
xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64
monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid
sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx
f16c rdrand lahf_lm cpuid_fault epb pti tpr_shadow flexp
riority ept vpid fsgsbase smep erms xsaveopt dtherm ida arat
pln pts vnmi
Virtualization features:
Virtualization: VT-x
Caches (sum of all):
L1d: 128 KiB (4 instances)
L1i: 128 KiB (4 instances)
L2: 1 MiB (4 instances)
L3: 6 MiB (1 instance)
NUMA:
NUMA node(s): 1
NUMA node0 CPU(s): 0-3
Vulnerabilities:
Gather data sampling: Not affected
Itlb multihit: KVM: Mitigation: VMX disabled
L1tf: Mitigation; PTE Inversion; VMX conditional cache flushes, SMT disabled
Mds: Vulnerable: Clear CPU buffers attempted, no microcode; SMT disabled
Meltdown: Mitigation; PTI
Mmio stale data: Unknown: No mitigations
Retbleed: Not affected
Spec rstack overflow: Not affected
Spec store bypass: Vulnerable
Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Spectre v2: Mitigation; Retpolines, STIBP disabled, RSB filling, PBRSB-eIBRS Not affected
Srbds: Vulnerable: No microcode
Tsx async abort: Not affected

fons@zita1:~> uname -a
Linux zita1 6.5.5-arch1-1 #1 SMP PREEMPT_DYNAMIC Sat, 23 Sep 2023 22:55:13 +0000 x86_64 GNU/Linux


zita4 (laptop)

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): 4
On-line CPU(s) list: 0-3
Vendor ID: GenuineIntel
Model name: Intel(R) Core(TM) i5-4300U CPU @ 1.90GHz
CPU family: 6
Model: 69
Thread(s) per core: 2
Core(s) per socket: 2
Socket(s): 1
Stepping: 1
CPU(s) scaling MHz: 46%
CPU max MHz: 2900.0000
CPU min MHz: 800.0000
BogoMIPS: 4990.47
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall
nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good
nopl xtopology nons top_tsc cpuid aperfmperf pni pclmulqdq dtes64
monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid
sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand lahf_lm
abm cpuid_fault epb invpcid_single pti tpr_shadow vnmi flexpriority
ept vpid ept_ad fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms
invpcid rtm xsaveopt dtherm ida arat pln pts
Virtualization features:
Virtualization: VT-x
Caches (sum of all):
L1d: 64 KiB (2 instances)
L1i: 64 KiB (2 instances)
L2: 512 KiB (2 instances)
L3: 3 MiB (1 instance)
NUMA:
NUMA node(s): 1
NUMA node0 CPU(s): 0-3
Vulnerabilities:
Itlb multihit: KVM: Mitigation: VMX disabled
L1tf: Mitigation; PTE Inversion; VMX conditional cache flushes, SMT vulnerable
Mds: Vulnerable: Clear CPU buffers attempted, no microcode; SMT vulnerable
Meltdown: Mitigation; PTI
Mmio stale data: Unknown: No mitigations
Retbleed: Not affected
Spec store bypass: Vulnerable
Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Spectre v2: Mitigation; Retpolines, STIBP disabled, RSB filling, PBRSB-eIBRS Not affected
Srbds: Vulnerable: No microcode
Tsx async abort: Vulnerable: Clear CPU buffers attempted, no microcode; SMT vulnerable

fons@zita4:~> uname -a
Linux zita4 6.3.2-arch1-1 #1 SMP PREEMPT_DYNAMIC Thu, 11 May 2023 16:40:42 +0000 x86_64 GNU/Linux
(needs an update !)

> Regarding your question, if these functions may be useful to VOLK / GNU
> Radio. I'd say yes. We'd have to figure out how this may work in practice
> though. I'd suggest to start with a PR.

PR ?

Ciao,

--
FA