Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752030Ab2JLVC7 (ORCPT ); Fri, 12 Oct 2012 17:02:59 -0400 Received: from science.horizon.com ([71.41.210.146]:56261 "HELO science.horizon.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1751848Ab2JLVC6 (ORCPT ); Fri, 12 Oct 2012 17:02:58 -0400 Date: 12 Oct 2012 17:02:57 -0400 Message-ID: <20121012210257.11451.qmail@science.horizon.com> From: "George Spelvin" To: linux-kernel@vger.kernel.org Subject: Re: [PATCH RFC 2/2] [x86] Optimize copy_page by re-arranging instruction sequence and saving register Cc: linux@horizon.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3585 Lines: 82 Here are some Phenom results for that benchmark. The average time increases from 700 to 760 cycles (+8.6%). vendor_id : AuthenticAMD cpu family : 16 model : 2 model name : AMD Phenom(tm) 9850 Quad-Core Processor stepping : 3 microcode : 0x1000083 cpu MHz : 2500.210 cache size : 512 KB 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 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs hw_pstate npt lbrv svm_lock bogomips : 5000.42 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 copy_page_org copy_page_new TPT: Len 4096, alignment 0/ 0: 678 760 TPT: Len 4096, alignment 0/ 0: 710 760 TPT: Len 4096, alignment 0/ 0: 710 760 TPT: Len 4096, alignment 0/ 0: 710 760 TPT: Len 4096, alignment 0/ 0: 710 760 copy_page_org copy_page_new TPT: Len 4096, alignment 0/ 0: 667 760 TPT: Len 4096, alignment 0/ 0: 673 760 TPT: Len 4096, alignment 0/ 0: 710 760 TPT: Len 4096, alignment 0/ 0: 710 760 TPT: Len 4096, alignment 0/ 0: 710 760 copy_page_org copy_page_new TPT: Len 4096, alignment 0/ 0: 667 760 TPT: Len 4096, alignment 0/ 0: 673 760 TPT: Len 4096, alignment 0/ 0: 710 760 TPT: Len 4096, alignment 0/ 0: 710 760 TPT: Len 4096, alignment 0/ 0: 710 760 copy_page_org copy_page_new TPT: Len 4096, alignment 0/ 0: 671 760 TPT: Len 4096, alignment 0/ 0: 673 760 TPT: Len 4096, alignment 0/ 0: 671 760 TPT: Len 4096, alignment 0/ 0: 709 760 TPT: Len 4096, alignment 0/ 0: 708 760 copy_page_org copy_page_new TPT: Len 4096, alignment 0/ 0: 667 760 TPT: Len 4096, alignment 0/ 0: 710 760 TPT: Len 4096, alignment 0/ 0: 710 760 TPT: Len 4096, alignment 0/ 0: 710 760 TPT: Len 4096, alignment 0/ 0: 710 760 copy_page_org copy_page_new TPT: Len 4096, alignment 0/ 0: 671 760 TPT: Len 4096, alignment 0/ 0: 710 760 TPT: Len 4096, alignment 0/ 0: 710 760 TPT: Len 4096, alignment 0/ 0: 710 760 TPT: Len 4096, alignment 0/ 0: 710 760 copy_page_org copy_page_new TPT: Len 4096, alignment 0/ 0: 678 760 TPT: Len 4096, alignment 0/ 0: 709 758 TPT: Len 4096, alignment 0/ 0: 710 760 TPT: Len 4096, alignment 0/ 0: 709 759 TPT: Len 4096, alignment 0/ 0: 710 760 copy_page_org copy_page_new TPT: Len 4096, alignment 0/ 0: 680 760 TPT: Len 4096, alignment 0/ 0: 710 760 TPT: Len 4096, alignment 0/ 0: 710 760 TPT: Len 4096, alignment 0/ 0: 710 760 TPT: Len 4096, alignment 0/ 0: 710 760 copy_page_org copy_page_new TPT: Len 4096, alignment 0/ 0: 667 760 TPT: Len 4096, alignment 0/ 0: 710 760 TPT: Len 4096, alignment 0/ 0: 709 760 TPT: Len 4096, alignment 0/ 0: 709 759 TPT: Len 4096, alignment 0/ 0: 710 760 copy_page_org copy_page_new TPT: Len 4096, alignment 0/ 0: 678 760 TPT: Len 4096, alignment 0/ 0: 710 760 TPT: Len 4096, alignment 0/ 0: 710 760 TPT: Len 4096, alignment 0/ 0: 710 760 TPT: Len 4096, alignment 0/ 0: 710 760 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/