From: William Lee Irwin III <wli@holomorphy.com>
To: Andrew Morton <akpm@digeo.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.5.38-mm2 dbench $N times
Date: Tue, 24 Sep 2002 17:39:52 -0700 [thread overview]
Message-ID: <20020925003952.GF3530@holomorphy.com> (raw)
In-Reply-To: <3D9103EB.FC13A744@digeo.com>
William Lee Irwin III wrote:
>> Not sure. This is boot bay SCSI crud, but single-disk FC looks
>> *worse* for no obvious reason. Multiple disk tests do much better
>> (about matching the el-scruffo PC numbers above).
>>
On Tue, Sep 24, 2002 at 05:31:39PM -0700, Andrew Morton wrote:
> dbench 16 on that sort of machine is a memory bandwidth test.
> And a dcache lock exerciser. It basically doesn't touch the
> disk. Something very bad is happening.
> Anton can get 3000 MByte/sec ;)
Hmm, this is odd (remember, dcache_rcu is in here):
c01053dc 9194801 60.668 poll_idle
c01175db 1752528 11.5633 .text.lock.sched
c0114c08 1281763 8.45717 load_balance
c0106408 388517 2.56346 .text.lock.semaphore
c0147a4e 272571 1.79844 .text.lock.file_table
c0115080 265006 1.74853 scheduler_tick
c0132374 227403 1.50042 generic_file_write_nolock
c0115434 187759 1.23885 do_schedule
c01233c8 167905 1.10785 run_timer_tasklet
c0114778 103077 0.68011 try_to_wake_up
c010603c 100121 0.660606 __down
c0111788 96062 0.633824 smp_apic_timer_interrupt
c011fa20 70840 0.467408 tasklet_hi_action
c011f700 63125 0.416504 do_softirq
c0131880 60640 0.400107 file_read_actor
c0145dd0 53872 0.355452 generic_file_llseek
c01473e0 45819 0.302317 get_empty_filp
c0175190 35814 0.236304 ext2_new_block
c01476ac 31657 0.208875 __fput
c0146354 26755 0.176532 vfs_write
c010d718 26627 0.175687 timer_interrupt
c01a2cd0 26426 0.174361 atomic_dec_and_lock
c0123294 23022 0.151901 update_one_process
next prev parent reply other threads:[~2002-09-25 0:35 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-24 13:20 2.5.38-mm2 dbench $N times William Lee Irwin III
2002-09-24 17:47 ` Andrew Morton
2002-09-25 0:18 ` William Lee Irwin III
2002-09-25 0:25 ` William Lee Irwin III
2002-09-25 0:31 ` Andrew Morton
2002-09-25 0:39 ` William Lee Irwin III [this message]
2002-09-25 0:46 ` Andrew Morton
2002-09-25 1:08 ` Dave Hansen
2002-09-25 1:17 ` William Lee Irwin III
2002-09-25 6:03 ` Martin J. Bligh
2002-09-25 18:51 ` Andrew Theurer
2002-09-25 20:57 ` Martin J. Bligh
2002-09-25 21:05 ` Andrew Theurer
2002-09-25 23:57 ` William Lee Irwin III
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