linux-kernel - Mainline kernel OLTP performance update

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Message-ID: <D7C42C27E6CB1E4D8CBDF2F81EA92A260345BCC195@azsmsx501.amr.corp.intel.com>
Date:	Mon, 4 May 2009 08:54:42 -0700
From:	"Styner, Douglas W" <douglas.w.styner@...el.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	"Tripathi, Sharad C" <sharad.c.tripathi@...el.com>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"Wilcox, Matthew R" <matthew.r.wilcox@...el.com>,
	"Kleen, Andi" <andi.kleen@...el.com>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	"Ma, Chinang" <chinang.ma@...el.com>,
	"Wang, Peter Xihong" <peter.xihong.wang@...el.com>,
	"Nueckel, Hubert" <hubert.nueckel@...el.com>,
	"Recalde, Luis F" <luis.f.recalde@...el.com>,
	"Nelson, Doug" <doug.nelson@...el.com>,
	"Cheng, Wu-sun" <wu-sun.cheng@...el.com>,
	"Prickett, Terry O" <terry.o.prickett@...el.com>,
	"Shunmuganathan, Rajalakshmi" <rajalakshmi.shunmuganathan@...el.com>,
	"Garg, Anil K" <anil.k.garg@...el.com>,
	"Chilukuri, Harita" <harita.chilukuri@...el.com>,
	"chris.mason@...cle.com" <chris.mason@...cle.com>
Subject: Mainline kernel OLTP performance update

<this time with subject line>
Summary: Measured the mainline kernel from kernel.org (2.6.30-rc4). 

The regression for 2.6.30-rc4 against the baseline, 2.6.24.2 is 2.15% (2.6.30-rc3 regression was 1.91%).  Oprofile reports 70.1204% user, 29.874% system. 

Linux OLTP Performance summary
Kernel#            Speedup(x)   Intr/s  CtxSw/s us%     sys%    idle%   iowait%
2.6.24.2                1.000   22106   43709   75      24      0       0
2.6.30-rc4              0.978   30581   43034   75      25      0       0

Server configurations:
Intel Xeon Quad-core 2.0GHz  2 cpus/8 cores/8 threads
64GB memory, 3 qle2462 FC HBA, 450 spindles (30 logical units)


======oprofile CPU_CLK_UNHALTED for top 30 functions
Cycles% 2.6.24.2                   Cycles% 2.6.30-rc4
74.8578 <database>                 67.8732 <database>
1.0500 qla24xx_start_scsi          1.1162 qla24xx_start_scsi
0.8089 schedule                    0.9888 qla24xx_intr_handler
0.5864 kmem_cache_alloc            0.8776 __schedule
0.4989 __blockdev_direct_IO        0.7401 kmem_cache_alloc
0.4357 __sigsetjmp                 0.4914 read_hpet
0.4152 copy_user_generic_string    0.4792 __sigsetjmp
0.3953 qla24xx_intr_handler        0.4368 __blockdev_direct_IO
0.3850 memcpy                      0.3822 task_rq_lock
0.3596 scsi_request_fn             0.3781 __switch_to
0.3188 __switch_to                 0.3620 __list_add
0.2889 lock_timer_base             0.3377 rb_get_reader_page
0.2750 memmove                     0.3336 copy_user_generic_string
0.2519 task_rq_lock                0.3195 try_to_wake_up
0.2474 aio_complete                0.3114 scsi_request_fn
0.2460 scsi_alloc_sgtable          0.3114 ring_buffer_consume
0.2445 generic_make_request        0.2932 aio_complete
0.2263 qla2x00_process_completed_re0.2730 lock_timer_base
0.2118 blk_queue_end_tag           0.2588 memset_c
0.2085 dio_bio_complete            0.2588 mod_timer
0.2021 e1000_xmit_frame            0.2447 generic_make_request
0.2006 __end_that_request_first    0.2426 qla2x00_process_completed_re
0.1954 generic_file_aio_read       0.2265 tcp_sendmsg
0.1949 kfree                       0.2184 memmove
0.1915 tcp_sendmsg                 0.2184 kfree
0.1901 try_to_wake_up              0.2103 scsi_device_unbusy
0.1895 kref_get                    0.2083 mempool_free
0.1864 __mod_timer                 0.1961 blk_queue_end_tag
0.1863 thread_return               0.1941 kmem_cache_free
0.1854 math_state_restore          0.1921 kref_get
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