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A comment on AMD Ryzen 3000 Post-Review BIOS Update Recap: Larger ST Gains, Some Gains/Losses. Parent comment

Re:AMD Ryzen 3000 Post-Review BIOS Update Recap: Larger ST G... by mikedilger on Saturday July 13, 2019 @06:02PM (#20430447) 

  processor : 15
  vendor_id : AuthenticAMD
  cpu family : 23
  model  : 113
  model name : AMD Ryzen 7 3700X 8-Core Processor
  stepping : 0
  microcode : 0x8701013
  cpu MHz  : 1863.008
  cache size : 512 KB
  physical id : 0
  siblings : 16
  core id  : 7
  cpu cores : 8
  apicid  : 15
  initial apicid : 15
  fpu  : yes
  fpu_exception : yes
  cpuid level : 16
  wp  : yes
  flags  : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc cpuid extd_apicid aperfmperf pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb cat_l3 cdp_l3 hw_pstate sme ssbd mba sev ibpb stibp vmmcall fsgsbase bmi1 avx2 smep bmi2 cqm rdt_a rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local clzero irperf xsaveerptr wbnoinvd arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif umip rdpid overflow_recov succor smca
  bugs  : sysret_ss_attrs spectre_v1 spectre_v2 spec_store_bypass
  bogomips : 7189.14
  TLB size : 3072 4K pages
  clflush size : 64
  cache_alignment : 64
  address sizes : 43 bits physical, 48 bits virtual
  power management: ts ttp tm hwpstate cpb eff_freq_ro [13] [14]
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Re:AMD Ryzen 3000 Post-Review BIOS Update Recap: Larger ST G... by whereistimbo on Saturday July 13, 2019 @06:55PM (#20430651)
One advantage of AMD over Intel is AMD included SHA hardware acceleration on every Ryzen processor.
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Re:AMD Ryzen 3000 Post-Review BIOS Update Recap: Larger ST G... by ComputerGuru on Sunday July 14, 2019 @01:32AM (#20431824)
I actually wrote up about this back in 2017 [0]; the general feeling in the community at the time was that it would be “right around the corner” from Intel, but that hasn’t really happened.

[0]: https://neosmart.net/blog/2017/will-amds-ryzen-finally-bring...

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Re:AMD Ryzen 3000 Post-Review BIOS Update Recap: Larger ST G... by Avamander on Saturday July 13, 2019 @07:57PM (#20430855)
A lot of software is compiled for very generic CPUs, I wouldn't be surprised if it's not used in many cases.
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Re:AMD Ryzen 3000 Post-Review BIOS Update Recap: Larger ST G... by blattimwind on Saturday July 13, 2019 @08:05PM (#20430878)
That's not how things are done. Practically every library that has optimized implementations for stuff selects the implementation at runtime based on CPUID.
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Re:AMD Ryzen 3000 Post-Review BIOS Update Recap: Larger ST G... by Avamander on Saturday July 13, 2019 @08:37PM (#20430966)
Exactly, assuming optimized implementations in libraries, that's not always the case and binaries compiled just exactly for the one CPU tend to perform better.
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Re:AMD Ryzen 3000 Post-Review BIOS Update Recap: Larger ST G... by Avamander on Sunday July 14, 2019 @10:35AM (#20433617)
Don't know why the downvotes, do people think optimized implementations utilizing certain CPU features or combinations of them are somehow super common?
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Re:AMD Ryzen 3000 Post-Review BIOS Update Recap: Larger ST G... by blattimwind on Sunday July 14, 2019 @11:31AM (#20433945)
People think that because it is correct. Any serious crypto library (libsodium, OpenSSL, crypto++, cryptlib, ...) that comes to mind uses this approach, codecs use it, your C standard library uses it etc.
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Re:AMD Ryzen 3000 Post-Review BIOS Update Recap: Larger ST G... by Avamander on Sunday July 14, 2019 @11:32AM (#20433955)
But there's many other libraries out there than just those though?
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Re:AMD Ryzen 3000 Post-Review BIOS Update Recap: Larger ST G... by blattimwind on Sunday July 14, 2019 @11:37AM (#20433970)
"One advantage of AMD over Intel is AMD included SHA hardware acceleration on every Ryzen processor."

What do you think is more common? People rolling their own SHA implementation or people calling <insert crypto library>'s SHA256()? The former will barely get any sort of optimization, regardless of compiler flags, the latter will automatically use the SHA extensions.

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Re:AMD Ryzen 3000 Post-Review BIOS Update Recap: Larger ST G... by Avamander on Sunday July 14, 2019 @12:42PM (#20434362)
You indeed have a point about SHA extensions and people predominantly using a good crypto library, I guess I should've been more verbose that I meant new extensions in-general being a bit underutilized.
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Re:AMD Ryzen 3000 Post-Review BIOS Update Recap: Larger ST G... by ryacko on Saturday July 13, 2019 @07:51PM (#20430834)
SHA hardware acceleration is more likely to be used in SSH and some deduplication set ups, as well as git. It isn’t that much of a plus.
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Re:AMD Ryzen 3000 Post-Review BIOS Update Recap: Larger ST G... by trebligdivad on Saturday July 13, 2019 @06:12PM (#20430486)
Thanks! Lots of flags....
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