zesty_openssl_lp1674399.debdiff ** Description changed:
[Impact] * Context: AMD added support in their processors for SHA Extensions[1] (CPU flag: sha_ni[2]) starting with Ryzen[3] CPU. Note that Ryzen CPU come in 64bit only (Confirmed with AMD representative). Current OpenSSL version in Ryzens still calls SHA for SSSE3 routine as result a number of extensions were effectively masked on Ryzen and shows no improvement. [1] /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family : 23 model : 1 model name : AMD Ryzen 5 1600 Six-Core Processor 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 nonstop_tsc extd_apicid aperfmperf eagerfpu pni pclmulqdq monitor ssse3 fma cx16 sse 4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_l2 mwaitx hw_pstate vmmcall fsgsbase bmi1 avx2 smep bmi2 rdseed adx smap clflusho pt sha_ni xsaveopt xsavec xgetbv1 clzero arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold [2] - sha_ni: SHA1/SHA256 Instruction Extensions [3] - https://en.wikipedia.org/wiki/Ryzen ... All models support: x87, MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, AES, CLMUL, AVX, AVX2, FMA, CVT16/F16C, ABM, BMI1, BMI2, SHA.[5] ... * Program to performs the CPUID check: Reference : https://software.intel.com/en-us/articles/intel-sha-extensions ... Availability of the Intel® SHA Extensions on a particular processor can be determined by checking the SHA CPUID bit in CPUID.(EAX=07H, ECX=0):EBX.SHA [bit 29]. The following C function, using inline assembly, performs the CPUID check: -- int CheckForIntelShaExtensions() { int a, b, c, d; // Look for CPUID.7.0.EBX[29] // EAX = 7, ECX = 0 a = 7; c = 0; asm volatile ("cpuid" :"=a"(a), "=b"(b), "=c"(c), "=d"(d) :"a"(a), "c"(c) ); // Intel® SHA Extensions feature bit is EBX[29] return ((b >> 29) & 1); } -- On CPU with sha_ni the program return "1". Otherwise it return "0". [Test Case] * Reproducible with Xenial/Zesty/Artful release. * Generated a checksum of a big file (e.g. 5GB file) with openssl $ time /usr/bin/openssl dgst -sha256 /var/tmp/5Gfile SHA256(/var/tmp/5Gfile)= 8d448d81521cbc1bfdc04dd199d448bd3c49374221007bd0846d8d39a70dd4f8 real 0m12.835s user 0m12.344s sys 0m0.484s * Openssl speed $ openssl speed sha1 Doing sha1 for 3s on 16 size blocks: 9969152 sha1's in 3.00s Doing sha1 for 3s on 64 size blocks: 8019164 sha1's in 3.00s Doing sha1 for 3s on 256 size blocks: 5254219 sha1's in 2.99s Doing sha1 for 3s on 1024 size blocks: 2217067 sha1's in 3.00s Doing sha1 for 3s on 8192 size blocks: 347842 sha1's in 3.00s OpenSSL 1.0.2g 1 Mar 2016 built on: reproducible build, date unspecified options:bn(64,64) rc4(8x,int) des(idx,cisc,16,int) aes(partial) idea(int) blowfish(idx) compiler: gcc -I. -I.. -I../include -DOPENSSL_THREADS -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -Wa,--noexecstack -m64 -DL_ENDIAN -O3 -Wall -DOPENSSL_IA32_SSE2 -DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_MONT5 -DOPENSSL_BN_ASM_GF2m -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DMD5_ASM -DAES_ASM -DVPAES_ASM -DBSAES_ASM -DWHIRLPOOL_ASM -DGHASH_ASM -DECP_NISTZ256_ASM The 'numbers' are in 1000s of bytes per second processed. type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes sha1 53168.81k 171075.50k 449859.55k 756758.87k 949840.55 The performance are clearly better when using the patch which take benefit of the sha extension. (See Regression Potential section for result with patch) [Regression Potential] * Note : IRC discussion with infinity : https://bugs.launchpad.net/ubuntu/xenial/+source/openssl/+bug/1674399/comments/8 * Note from irc discussion with apw and rbasak : https://bugs.launchpad.net/ubuntu/+source/openssl/+bug/1674399/comments/2 * It basically allow openssl to take benefit of sha extension potential (mostly performance-wise) now that new AMD cpu starting to have the capability. * The code check the CPUID bit to determine if the sha instructions are available are not. * Maintainer comment proves that he did the successfully tested on Intel with/without SHA extension Reference: https://github.com/openssl/openssl/issues/2848 "I don't have access to Ryzen system, so I didn't test it explicitly on Ryzen. Reporter did confirm it tough. Myself I tested on Intel processors, yes, with/without." * LP reporter comment : - I, slashd, have tested on a Ryzen system (and AMD non-ryzen) and it does reveal a significant performance increase on Ryzen : - (Note that the performance remain the same on non-sha extension AMD CPU, as expected) + I, slashd, have tested on a Ryzen system (and AMD non-ryzen) and non-sha INTEL cpu. It does reveal a significant performance increase on Ryzen due to the sha extension : + (Note that the performance remain the same on non-sha extension CPU (AMD/INTEL), as expected since they don't take benefit of the sha extension technology) + [Tested on a Ryzen CPU] # Generated a checksum of a big file (e.g. 5GB file) with openssl $ time /usr/bin/openssl dgst -sha256 /var/tmp/5Gfile SHA256(/var/tmp/5Gfile)= 8d448d81521cbc1bfdc04dd199d448bd3c49374221007bd0846d8d39a70dd4f8 real 0m3.471s user 0m2.956s sys 0m0.516s # Openssl speed $ openssl speed sha1 Doing sha1 for 3s on 16 size blocks: 12081890 sha1's in 3.00s Doing sha1 for 3s on 64 size blocks: 11563950 sha1's in 3.00s Doing sha1 for 3s on 256 size blocks: 8375101 sha1's in 3.00s Doing sha1 for 3s on 1024 size blocks: 3987643 sha1's in 3.00s Doing sha1 for 3s on 8192 size blocks: 678036 sha1's in 3.00s OpenSSL 1.0.2g 1 Mar 2016 built on: reproducible build, date unspecified options:bn(64,64) rc4(8x,int) des(idx,cisc,16,int) aes(partial) idea(int) blowfish(idx) compiler: gcc -I. -I.. -I../include -DOPENSSL_THREADS -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -Wa,--noexecstack -m64 -DL_ENDIAN -O3 -Wall -DOPENSSL_IA32_SSE2 -DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_MONT5 -DOPENSSL_BN_ASM_GF2m -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DMD5_ASM -DAES_ASM -DVPAES_ASM -DBSAES_ASM -DWHIRLPOOL_ASM -DGHASH_ASM -DECP_NISTZ256_ASM The 'numbers' are in 1000s of bytes per second processed. type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes sha1 64436.75k 246697.60k 714675.29k 1361115.48k 1851490.30k [Other Info] * Debian Bug : https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=861145 * Upstream PR : https://github.com/openssl/openssl/issues/2848 * Upstream Repository : https://github.com/openssl/openssl.git * Upstream Commits : 1aed5e1 crypto/x86*cpuid.pl: move extended feature detection. ## This fix moves extended feature detection past basic feature detection where it belongs. f8418d8 crypto/x86_64cpuid.pl: move extended feature detection upwards. ## This commit for x86_64cpuid.pl addressed the problem, but messed up processor vendor detection. ** Patch added: "zesty_openssl_lp1674399.debdiff" https://bugs.launchpad.net/ubuntu/+source/openssl/+bug/1674399/+attachment/4868958/+files/zesty_openssl_lp1674399.debdiff -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1674399 Title: OpenSSL CPU detection for AMD Ryzen CPUs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openssl/+bug/1674399/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
