From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Tue, 25 Feb 2003 18:46:25 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Tue, 25 Feb 2003 18:46:25 -0500 Received: from gull.mail.pas.earthlink.net ([207.217.120.84]:39060 "EHLO gull.mail.pas.earthlink.net") by vger.kernel.org with ESMTP id ; Tue, 25 Feb 2003 18:46:23 -0500 Date: Tue, 25 Feb 2003 16:57:55 -0500 To: linux-kernel@vger.kernel.org Cc: akpm@digeo.com Subject: Re: IO scheduler benchmarking Message-ID: <20030225215755.GA2038@rushmore> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.4i From: rwhron@earthlink.net Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > Why does 2.5.62-mm2 have higher sequential > write latency than 2.5.61-mm1? Anticipatory scheduler tiobench profile on uniprocessor: 2.5.61-mm1 2.5.62-mm2 total 1993387 1933241 default_idle 1873179 1826650 system_call 49838 43036 get_offset_tsc 21905 20883 do_schedule 13893 10344 do_gettimeofday 8478 6044 sys_gettimeofday 8077 5153 current_kernel_time 4904 12165 syscall_exit 4047 1243 __wake_up 1274 1000 io_schedule 1166 1039 prepare_to_wait 1093 792 schedule_timeout 612 366 delay_tsc 502 443 get_fpu_cwd 473 376 syscall_call 389 378 math_state_restore 354 271 restore_fpu 329 287 del_timer 325 200 device_not_available 290 377 finish_wait 257 181 add_timer 218 137 io_schedule_timeout 195 72 cpu_idle 193 218 run_timer_softirq 137 33 remove_wait_queue 121 188 eligible_child 106 154 sys_wait4 105 162 work_resched 104 110 ret_from_intr 97 74 dup_task_struct 75 48 add_wait_queue 67 124 __cond_resched 59 69 do_page_fault 55 0 do_softirq 53 12 pte_alloc_one 51 67 release_task 44 55 get_signal_to_deliver 38 43 get_wchan 16 10 mod_timer 15 0 old_mmap 14 19 prepare_to_wait_exclusive 10 32 mm_release 7 0 release_x86_irqs 7 8 sys_getppid 6 5 handle_IRQ_event 4 0 schedule_tail 4 0 kill_proc_info 3 0 device_not_available_emulate 2 0 task_prio 1 1 __down 0 33 __down_failed_interruptible 0 3 init_fpu 0 12 pgd_ctor 0 3 process_timeout 0 2 restore_all 0 2 sys_exit 0 2 -- Randy Hron http://home.earthlink.net/~rwhron/kernel/bigbox.html