From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ondrej Zary Subject: Re: [git patches] IDE update Date: Tue, 05 Jul 2005 17:00:05 +0200 Message-ID: <42CAA075.4040406@rainbow-software.org> References: <42C9C56D.7040701@tomt.net> <42CA5A84.1060005@rainbow-software.org> <20050705101414.GB18504@suse.de> <42CA5EAD.7070005@rainbow-software.org> <20050705104208.GA20620@suse.de> <42CA7EA9.1010409@rainbow-software.org> <1120567900.12942.8.camel@linux> <42CA84DB.2050506@rainbow-software.org> <1120569095.12942.11.camel@linux> <42CAAC7D.2050604@rainbow-software.org> <20050705142122.GY1444@suse.de> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="=_tic-18115-1120575608-0001-2" Return-path: Received: from mailhub3.nextra.sk ([195.168.1.146]:9221 "EHLO mailhub3.nextra.sk") by vger.kernel.org with ESMTP id S261878AbVGEPAP (ORCPT ); Tue, 5 Jul 2005 11:00:15 -0400 In-Reply-To: <20050705142122.GY1444@suse.de> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Jens Axboe Cc: =?ISO-8859-1?Q?Andr=E9_Tomt?= , Al Boldi , 'Bartlomiej Zolnierkiewicz' , 'Linus Torvalds' , linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org This is a MIME-formatted message. If you see this text it means that your E-mail software does not support MIME-formatted messages. --=_tic-18115-1120575608-0001-2 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 7bit Jens Axboe wrote: > On Tue, Jul 05 2005, Ondrej Zary wrote: > >>Jens Axboe wrote: >> >>>On Tue, 2005-07-05 at 15:02 +0200, Ondrej Zary wrote: >>> >>> >>>>>Ok, looks alright for both. Your machine is quite slow, perhaps that is >>>>>showing the slower performance. Can you try and make HZ 100 in 2.6 and >>>>>test again? 2.6.13-recent has it as a config option, otherwise edit >>>>>include/asm/param.h appropriately. >>>>> >>>> >>>>I forgot to write that my 2.6.12 kernel is already compiled with HZ 100 >>>>(it makes the system more responsive). >>>>I've just tried 2.6.8.1 with HZ 1000 and there is no difference in HDD >>>>performance comparing to 2.6.12. >>> >>> >>>OK, interesting. You could try and boot with profile=2 and do >>> >>># readprofile -r >>># dd if=/dev/hda of=/dev/null bs=128k >>># readprofile > prof_output >>> >>>for each kernel and post it here, so we can see if anything sticks out. >>> >> >>Here are the profiles (used dd with count=4096) from 2.4.26 and 2.6.12 >>(nothing from 2.6.8.1 because I don't have the .map file anymore). > > > Looks interesting, 2.6 spends oodles of times copying to user space. > Lets check if raw reads perform ok, please try and time this app in 2.4 > and 2.6 as well. > > # gcc -Wall -O2 -o oread oread.c > # time ./oread /dev/hda > oread is faster than dd, but still not as fast as 2.4. In 2.6.12, HDD led is blinking, in 2.4 it's solid on during the read. 2.6.12: root@pentium:/home/rainbow# time ./oread /dev/hda real 0m25.082s user 0m0.000s sys 0m0.680s 2.4.26: root@pentium:/home/rainbow# time ./oread /dev/hda real 0m23.513s user 0m0.000s sys 0m2.360s -- Ondrej Zary --=_tic-18115-1120575608-0001-2 Content-Type: text/plain; name="profile-oread2426.txt"; charset=iso-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline; filename="profile-oread2426.txt" 2016 default_idle 25.2000 1 system_call 0.0156 2 handle_IRQ_event 0.0179 1 schedule 0.0012 1 __run_task_queue 0.0104 4 follow_page 0.0312 3 get_user_pages 0.0063 4 mark_dirty_kiobuf 0.0357 1 handle_mm_fault 0.0048 2 generic_file_direct_IO 0.0026 1 lru_cache_add 0.0089 2 init_buffer 0.0625 12 set_bh_page 0.1071 3 create_buffers 0.0134 30 generic_direct_IO 0.0457 17 brw_kiovec 0.0186 11 max_block 0.0764 9 blkdev_get_block 0.1406 2 blkdev_direct_IO 0.0417 1 write_profile 0.0208 2 generic_unplug_device 0.0312 93 __make_request 0.0524 25 generic_make_request 0.0781 20 submit_bh 0.0781 5 ide_inb 0.3125 12 ide_outb 0.7500 1 ide_outl 0.0625 1 ide_wait_stat 0.0030 4 ide_execute_command 0.0312 2 ide_do_request 0.0050 4 ide_get_queue 0.0625 2 ide_intr 0.0069 2 ide_dma_intr 0.0104 10 ide_build_sglist 0.0160 1 ide_build_dmatable 0.0024 1 __ide_dma_read 0.0042 1 __constant_c_and_count_memset 0.0069 1 __ide_do_rw_disk 0.0007 42 idedisk_end_request 0.2188 4 __rdtsc_delay 0.1250 0 *unknown* 2356 total 0.0013 --=_tic-18115-1120575608-0001-2 Content-Type: text/plain; name="profile-oread2612.txt"; charset=iso-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline; filename="profile-oread2612.txt" 1 sched_clock 0.0057 3 cond_resched_lock 0.0312 2 write_profile 0.0312 1 __wake_up_bit 0.0208 2 __generic_file_aio_read 0.0038 1 generic_file_read 0.0052 1 mempool_alloc 0.0037 1 set_page_dirty 0.0125 3 set_page_dirty_lock 0.0625 4 __follow_page 0.0227 7 get_user_pages 0.0072 2 do_wp_page 0.0025 8 __bio_add_page 0.0227 5 bio_add_page 0.1562 1 bio_set_map_data 0.0208 1 update_atime 0.0057 1 dio_get_page 0.0156 1 dio_bio_submit 0.0069 2 dio_bio_complete 0.0096 5 submit_page_section 0.0164 1 dio_zero_block 0.0078 13 do_direct_IO 0.0150 2 direct_io_worker 0.0014 2 __copy_to_user_ll 0.0312 2428 acpi_processor_idle 4.0000 4 blk_rq_map_sg 0.0114 10 __make_request 0.0086 1 generic_make_request 0.0022 1 as_set_request 0.0089 4 ide_end_request 0.0278 6 ide_do_request 0.0072 1 ide_intr 0.0026 5 ide_outb 0.3125 1 ide_execute_command 0.0063 2 ide_build_sglist 0.0139 5 schedule 0.0033 1 io_schedule 0.0312 0 *unknown* 2539 total 0.0012 --=_tic-18115-1120575608-0001-2--