From: Ian Godin <Ian.Godin@lowrydigital.com>
To: linux-kernel@vger.kernel.org
Subject: Re: Drive performance bottleneck
Date: Thu, 3 Feb 2005 08:49:42 -0800 [thread overview]
Message-ID: <1e90ea5b2039243539df074d7bc9a658@lowrydigital.com> (raw)
In-Reply-To: <E1CwY6U-0003p6-00@calista.eckenfels.6bone.ka-ip.net>
On Feb 2, 2005, at 7:56 PM, Bernd Eckenfels wrote:
> In article <c4fc982390674caa2eae4f252bf4fc78@lowrydigital.com> you
> wrote:
>> Below is an oprofile (truncated) of (the same) dd running on
>> /dev/sdb.
>
> do you also have the oprofile of the sg_dd handy?
>
> Greetings
> Bernd
>
Just ran it on the sg_dd (using /dev/sg1):
CPU: P4 / Xeon, speed 3402.13 MHz (estimated)
Counted GLOBAL_POWER_EVENTS events (time during which processor is not
stopped) with a unit mask of 0x01 (mandatory) count 10
0000
samples % symbol name
2145136 89.7474 __copy_to_user_ll
64720 2.7077 lock_kernel
17883 0.7482 mark_offset_tsc
16212 0.6783 page_address
8091 0.3385 schedule
5380 0.2251 timer_interrupt
5314 0.2223 _spin_lock
5311 0.2222 mwait_idle
4034 0.1688 sysenter_past_esp
3569 0.1493 do_anonymous_page
3530 0.1477 apic_timer_interrupt
3368 0.1409 _spin_lock_irqsave
3150 0.1318 sg_read_xfer
3043 0.1273 kmem_cache_alloc
2590 0.1084 find_busiest_group
2553 0.1068 scheduler_tick
2319 0.0970 __copy_from_user_ll
2299 0.0962 sg_ioctl
2131 0.0892 irq_entries_start
1905 0.0797 sys_ioctl
1773 0.0742 copy_page_range
1678 0.0702 fget
1648 0.0689 __switch_to
1648 0.0689 scsi_block_when_processing_errors
1632 0.0683 sg_start_req
1569 0.0656 increment_tail
1511 0.0632 try_to_wake_up
1506 0.0630 update_one_process
1454 0.0608 fput
1397 0.0584 do_gettimeofday
1396 0.0584 zap_pte_range
1371 0.0574 recalc_task_prio
1357 0.0568 sched_clock
1352 0.0566 sg_link_reserve
1282 0.0536 __elv_add_request
1229 0.0514 kmap_atomic
1195 0.0500 page_fault
Oddly enough it appears to also be copying to user space...
Ian.
next prev parent reply other threads:[~2005-02-03 16:50 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-03 2:24 Ian Godin
2005-02-03 3:56 ` Bernd Eckenfels
2005-02-03 16:49 ` Ian Godin [this message]
2005-02-03 16:06 ` Jens Axboe
2005-02-03 17:40 ` Nuno Silva
2005-02-03 18:08 ` Ian Godin
2005-02-03 19:03 ` Paulo Marques
2005-02-04 19:36 ` Andy Isaacson
2005-02-04 9:32 ` Andrew Morton
2005-02-04 22:51 ` Lincoln Dale
2005-02-04 23:07 ` Andrew Morton
2005-02-06 4:25 ` Nuno Silva
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