On Tue, Feb 24, 2015 at 04:25:40AM +0000, Vithal S Mohare wrote: > Hi Neil, > > > While most of the newer CPUs supports ssse3, found a I7 not supporting it. > So, DPDK can't run these CPUs? Is this restriction acceptable? > It has to run on all systems greater than -march=core2, as that is what the default config targets. So if it can't run on a core2 system, this patch isn't acceptable. Neil
> -sh-3.2$ cat /proc/cpuinfo > processor : 0 > vendor_id : GenuineIntel > cpu family : 6 > model : 26 > model name : Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz > stepping : 5 > cpu MHz : 2660.068 > cache size : 8192 KB > physical id : 0 > siblings : 8 > core id : 0 > cpu cores : 4 > apicid : 0 > fpu : yes > fpu_exception : yes > cpuid level : 11 > wp : yes > 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 syscall nx rdtscp lm > constant_tsc pni monitor ds_cpl vmx est tm2 cx16 xtpr popcnt lahf_lm > > Thanks, > -Vithal > > -----Original Message----- > From: Neil Horman [mailto:nhorman at tuxdriver.com] > Sent: Thursday, February 19, 2015 6:13 PM > To: Vithal S Mohare > Cc: dev at dpdk.org > Subject: Re: [dpdk-dev] rte_memcpy optimization patch to dpdk ver 1.7 > > On Wed, Feb 18, 2015 at 04:09:25AM +0000, Vithal S Mohare wrote: > > Ok, crash, as expected. So, now dpdk mandates either AVX2 or SSSE2 > > supported CPUs. OR applications needs to handle it run-time. > > > No, sse3 is the minimum, but I think thats been the case for quite some time > now, I think. > > Neil > > > Thanks, > > -Vithal > > > > -----Original Message----- > > From: Neil Horman [mailto:nhorman at tuxdriver.com] > > Sent: Tuesday, February 17, 2015 6:32 PM > > To: Vithal S Mohare > > Cc: dev at dpdk.org > > Subject: Re: [dpdk-dev] rte_memcpy optimization patch to dpdk ver 1.7 > > > > On Tue, Feb 17, 2015 at 08:39:22AM +0000, Vithal S Mohare wrote: > > > Hi, > > > > > > I am trying to use rte_memcpy optimization patch along with dpdk version > > > 1.7. With the patch, while dpdk itself is compiled, applications failed > > > with below error: > > > ------------------------------- > > > include/rte_memcpy.h:629:2: error: implicit declaration of function > > > '_mm_alignr_epi8' [-Werror=implicit-function-declaration] > > > /home/vithals/adu_src/build/x-men_dev/Default/shumway/infra/dpdk/shumway_obj/lib/../include/rte_memcpy.h:629:2: > > > error: incompatible type for argument 2 of '_mm_storeu_si128' > > > ------------------------------- > > > > > > After including -mssse3 flags, compilation (cross compiled for a x86 > > > linux based platform) went through. Now the question is, when this > > > binary is loaded on system that doesn't support SSSE3 instruction set > > > (but just sse2 etc), what would be the behavior? > > > > > A crash. You'll attempt to send an unknown binary instruction into the > > execution pipeline and the processor will fault. > > > > Neil > > > > > > >
