Mainline kernel OLTP performance update

[Styner, Douglas W]

Summary: Measured the mainline kernel from kernel.org (2.6.30-rc3). 

The regression for 2.6.30-rc3 against the baseline, 2.6.24.2 is 1.91%.  Oprofile reports 71.1626% user, 28.8295% 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-rc3              0.981   30645   43027   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-rc3
74.8578 <database>                 69.1925 <database>
1.0500 qla24xx_start_scsi          1.1314 qla24xx_intr_handler
0.8089 schedule                    1.0031 qla24xx_start_scsi
0.5864 kmem_cache_alloc            0.8476 __schedule
0.4989 __blockdev_direct_IO        0.6532 kmem_cache_alloc
0.4357 __sigsetjmp                 0.4490 __blockdev_direct_IO
0.4152 copy_user_generic_string    0.4199 __sigsetjmp
0.3953 qla24xx_intr_handler        0.3946 __switch_to
0.3850 memcpy                      0.3538 __list_add
0.3596 scsi_request_fn             0.3499 task_rq_lock
0.3188 __switch_to                 0.3402 scsi_request_fn
0.2889 lock_timer_base             0.3382 rb_get_reader_page
0.2750 memmove                     0.3363 copy_user_generic_string
0.2519 task_rq_lock                0.3324 aio_complete
0.2474 aio_complete                0.3110 try_to_wake_up
0.2460 scsi_alloc_sgtable          0.2877 ring_buffer_consume
0.2445 generic_make_request        0.2683 mod_timer
0.2263 qla2x00_process_completed_re0.2605 qla2x00_process_completed_re
0.2118 blk_queue_end_tag           0.2566 blk_queue_end_tag
0.2085 dio_bio_complete            0.2566 generic_make_request
0.2021 e1000_xmit_frame            0.2547 tcp_sendmsg
0.2006 __end_that_request_first    0.2372 lock_timer_base
0.1954 generic_file_aio_read       0.2333 memmove
0.1949 kfree                       0.2294 memset_c
0.1915 tcp_sendmsg                 0.2080 mempool_free
0.1901 try_to_wake_up              0.2022 generic_file_aio_read
0.1895 kref_get                    0.1963 scsi_device_unbusy
0.1864 __mod_timer                 0.1963 plist_del
0.1863 thread_return               0.1944 dequeue_rt_stack
0.1854 math_state_restore          0.1924 e1000_xmit_frame

Thanks
Doug
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