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Date: Wed, 11 Nov 2009 23:34:25 +0300 From: Cyrill Gorcunov <gorcunov@...il.com> To: "Ma, Ling" <ling.ma@...el.com> Cc: Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, linux-kernel <linux-kernel@...r.kernel.org> Subject: Re: [PATCH RFC] [X86] performance improvement for memcpy_64.S by fast string. On Wed, Nov 11, 2009 at 03:05:34PM +0800, Ma, Ling wrote: > Hi All > Please use the memcpy.c(cc -o memcpy memcpy.c -O2) to test more cases, > if you have interest. In this program we did simple modification > on memcpy_new function. > > Thanks > Ling Just my 0.2$ :) -- Cyrill --- memcpy_orig memcpy_new TPT: Len 1024, alignment 8/ 0: 490 570 TPT: Len 2048, alignment 8/ 0: 826 329 TPT: Len 3072, alignment 8/ 0: 441 464 TPT: Len 4096, alignment 8/ 0: 579 596 TPT: Len 5120, alignment 8/ 0: 723 729 TPT: Len 6144, alignment 8/ 0: 859 861 TPT: Len 7168, alignment 8/ 0: 996 994 TPT: Len 8192, alignment 8/ 0: 1165 1127 TPT: Len 9216, alignment 8/ 0: 1273 1260 TPT: Len 10240, alignment 8/ 0: 1402 1395 TPT: Len 11264, alignment 8/ 0: 1543 1525 TPT: Len 12288, alignment 8/ 0: 1682 1659 TPT: Len 13312, alignment 8/ 0: 1869 1815 TPT: Len 14336, alignment 8/ 0: 1982 1951 TPT: Len 15360, alignment 8/ 0: 2185 2110 --- I've run this test a few times and results almost the same, with alignment 1024, 3072, 4096, 5120, 6144, new version a bit slowly. --- processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 23 model name : Intel(R) Core(TM)2 Duo CPU T8100 @ 2.10GHz stepping : 6 cpu MHz : 800.000 cache size : 3072 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 2 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 10 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 pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 lahf_lm ida tpr_shadow vnmi flexpriority bogomips : 4189.60 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 23 model name : Intel(R) Core(TM)2 Duo CPU T8100 @ 2.10GHz stepping : 6 cpu MHz : 800.000 cache size : 3072 KB physical id : 0 siblings : 2 core id : 1 cpu cores : 2 apicid : 1 initial apicid : 1 fpu : yes fpu_exception : yes cpuid level : 10 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 pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 lahf_lm ida tpr_shadow vnmi flexpriority bogomips : 4189.46 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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