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DIR:OUT; SFP:1101; X-OriginatorOrg: commscope.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Mar 2021 12:38:55.0899 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2063e7fa-4fc7-4fa3-f8c6-08d8dfd3a3d7 X-MS-Exchange-CrossTenant-Id: 31472f81-8fe4-49ec-8bc3-fa1c295640d7 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=31472f81-8fe4-49ec-8bc3-fa1c295640d7; Ip=[3.132.208.199]; Helo=[obc.inkyphishfence.com] X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: TreatMessagesAsInternal-MW2NAM10FT023.eop-nam10.prod.protection.outlook.com X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR14MB3264 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.29 Subject: Re: [dpdk-users] Segmentation fault with -msse3 X-BeenThere: users@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK usage discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: users-bounces@dpdk.org Sender: "users" Archived-At: List-Archive: Hi Nicolas, I do not have experience of running DPDK on AMD CPUs. I can however suggest this: Please try compiling the kernel modules that you attach to the NICs you are= going to use on the same machine. The kernel module is igb_uio.ko. Your issue could be because the kernel module/driver was not compiled for t= his CPU. If you have compiled your dpdk sdk, then the kernel module should be presen= t here: ./build/build/kernel/linux/igb_uio/igb_uio.ko ./build/kmod/igb_uio.ko Then load these kernel modules using: modprobe uio insmod ./build/kmod/igb_uio.ko Now, bind the NICs you are going to use, to this driver using : ./usertools/dpdk-devbind.py --bind=3Digb_uio You can get the PCI addresses of the NICs using: ./usertools/dpdk-devbind.py --status-dev net I hope this helps, but if it doesn't, someone with more hands on experience= on DPDK + AMD should take a look. Regards, Surajit From: nicolas.neel@allentis.eu Sent: Friday, March 5, 2021 4:56 PM To: Das, Surajit ; users@dpdk.org Subject: [dpdk-users] Segmentation fault with -msse3 Hi Surajit, Thanks for your reactivity and your help. Like you, I thought t= he cpu has no ssse3 instruction, but if you take a look on the CPU flags, t= he SSSE3 flag is present. flags : fpu vme de pse t External (nicolas.neel@allentis.eu) Report This Email FAQ= Protection by INKY Hi Surajit, Thanks for your reactivity and your help. Like you, I thought the cpu has no ssse3 instruction, but if you take a loo= k on the CPU flags, the SSSE3 flag is present. 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 pdpe= 1gb rdtscp lm constant_tsc art rep_good nopl nonstop_tsc extd_apicid aperfm= perf eagerfpu pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 x2apic mov= be popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_lega= cy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt tce topoext perf= ctr_core perfctr_nb bpext perfctr_l2 cpb cat_l3 cdp_l3 hw_pstate sme retpol= ine_amd ssbd ibrs ibpb stibp vmmcall fsgsbase bmi1 avx2 smep bmi2 cqm rdt_a= rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 cqm_llc cqm= _occup_llc cqm_mbm_total cqm_mbm_local clzero irperf xsaveerptr arat npt lb= rv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausef= ilter pfthreshold avic v_vmsave_vmload vgif umip overflow_recov succor smca I build my programm on a vitual machine (with a intel cpu) and run it on a = physical machine with a AMD cpu. I use the =AB -march=3Dznver2 =BB to gen= erate instructions for the AMD Cpu (AMD EPYC 7402P). I need to have a maximum of performance, so, if I could do some instructio= n in CPU instead in the software. May be I miss something, a flag ? a library ? , if someone could help me ? = I don't have many experiance about CPU instructions/optimisations. Any help will be appreciate. Best regards Nicolas De : Das, Surajit > Envoy=E9 : jeudi 4 mars 2021 18:28 =C0 : nicolas.neel@allentis.eu; users@dpdk= .org Objet : RE: [dpdk-users] Segmentation fault with -msse3 Hi Nicolas, Looks like the CPU you are running on does not have the instruction ssse3. To check the list of flags available of your cpu, you can run: lscpu | grep Flags You will find that in the list of flags, ssse3 is not available on your cpu= . You can compile and run your app with the flag removed without functional i= ssues. Only difference will be that a bunch of instructions that could have been d= one faster in CPU hardware using ssse3, will now be done in software. Regards, Surajit From: users > On Beha= lf Of nicolas.neel@allentis.eu Sent: Thursday, March 4, 2021 10:27 PM To: users@dpdk.org Subject: [dpdk-users] Segmentation fault with -msse3 Hello dpdk users, I'm a newbie to dpdk and I try to get the list of the rss hash functions fo= r a given port with the following code : static uint64_t get_rss_function(int port_id){ int ret; struct rte_eth_rss_conf rss_conf; ret =3D rte_eth_dev_rss_hash_conf_get(port_id,&rss_conf); if(ret < 0){ printf("No supported rss\n"); return 0; } return rss_conf.rss_hf; } I use dpdk version 20.11 and my code is compiled with the following flags (= I 'm following the tips of the doc) : CXXFLAGS +=3D -mssse3 -mfma -mcx16 -msse4.1 -msse4.2 -mpopcnt -mavx -mavx2 -DALLOW_EXPERIMENTAL_API I have a segmentation fault calling ret =3D rte_eth_dev_rss_hash_conf_get(port_id,&rss_conf) ; and the coredump tell an issue with __memcpy_ssse3(). If I remove the -mssse3 I don't have the crash. Can you help me to identify the reason of the segmentation fault and tell m= e if I can easily remove the < -mssse3 > flag ? (Sorry for my english) Regards Nicolas