Mainline kernel OLTP performance update

[Ma, Chinang]

Here is the latest 2.6.28 kernel OLTP performance comparing to 2.6.24.2 and 2.6.27.2. 

Linux OLTP Performance summary
Kernel#            Speedup(x)   Intr/s  CtxSw/s us%  sys%  idle% iowait%
2.6.24.2                1.000   21969   43425   76   24    0     0
2.6.27.2                0.973   30402   43523   74   25    0     1
2.6.28                  0.967   30400   42640   74   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% 2.6.27.2
1.0500 qla24xx_start_scsi          1.2125 qla24xx_start_scsi
0.8089 schedule                    0.6962 kmem_cache_alloc
0.5864 kmem_cache_alloc            0.6209 qla24xx_intr_handler
0.4989 __blockdev_direct_IO        0.4895 copy_user_generic_string
0.4152 copy_user_generic_string    0.4591 __blockdev_direct_IO
0.3953 qla24xx_intr_handler        0.4409 __end_that_request_first
0.3596 scsi_request_fn             0.3729 __switch_to
0.3188 __switch_to                 0.3716 try_to_wake_up
0.2889 lock_timer_base             0.3531 lock_timer_base
0.2519 task_rq_lock                0.3393 scsi_request_fn
0.2474 aio_complete                0.3038 aio_complete
0.2460 scsi_alloc_sgtable          0.2989 memset_c
0.2445 generic_make_request        0.2633 qla2x00_process_completed_re
0.2263 qla2x00_process_completed_re0.2583 pick_next_highest_task_rt
0.2118 blk_queue_end_tag           0.2578 generic_make_request
0.2085 dio_bio_complete            0.2510 __list_add
0.2021 e1000_xmit_frame            0.2459 task_rq_lock
0.2006 __end_that_request_first    0.2322 kmem_cache_free
0.1954 generic_file_aio_read       0.2206 blk_queue_end_tag
0.1949 kfree                       0.2205 __mod_timer
0.1915 tcp_sendmsg                 0.2179 update_curr_rt
0.1901 try_to_wake_up              0.2164 sd_prep_fn
0.1895 kref_get                    0.2130 kref_get
0.1864 __mod_timer                 0.2075 dio_bio_complete
0.1863 thread_return               0.2066 push_rt_task
0.1854 math_state_restore          0.1974 qla24xx_msix_default
0.1775 __list_add                  0.1935 generic_file_aio_read
0.1721 memset_c                    0.1870 scsi_device_unbusy
0.1706 find_vma                    0.1861 tcp_sendmsg
0.1688 read_tsc                    0.1843 e1000_xmit_frame


======oprofile CPU_CLK_UNHALTED for top 30 functions
Cycles% 2.6.27.2                   Cycles% 2.6.28
1.2125 qla24xx_start_scsi          1.4257 qla24xx_start_scsi
0.6962 kmem_cache_alloc            0.8784 kmem_cache_alloc
0.6209 qla24xx_intr_handler        0.6876 qla24xx_intr_handler
0.4895 copy_user_generic_string    0.5834 copy_user_generic_string
0.4591 __blockdev_direct_IO        0.4945 scsi_request_fn
0.4409 __end_that_request_first    0.4846 __blockdev_direct_IO
0.3729 __switch_to                 0.4187 try_to_wake_up
0.3716 try_to_wake_up              0.3518 aio_complete
0.3531 lock_timer_base             0.3513 __end_that_request_first
0.3393 scsi_request_fn             0.3483 __switch_to
0.3038 aio_complete                0.3271 memset_c
0.2989 memset_c                    0.2976 qla2x00_process_completed_re
0.2633 qla2x00_process_completed_re0.2905 __list_add
0.2583 pick_next_highest_task_rt   0.2901 generic_make_request
0.2578 generic_make_request        0.2755 lock_timer_base
0.2510 __list_add                  0.2741 blk_queue_end_tag
0.2459 task_rq_lock                0.2593 kmem_cache_free
0.2322 kmem_cache_free             0.2445 disk_map_sector_rcu
0.2206 blk_queue_end_tag           0.2370 pick_next_highest_task_rt
0.2205 __mod_timer                 0.2323 scsi_device_unbusy
0.2179 update_curr_rt              0.2321 task_rq_lock
0.2164 sd_prep_fn                  0.2316 scsi_dispatch_cmd
0.2130 kref_get                    0.2239 kref_get
0.2075 dio_bio_complete            0.2237 dio_bio_complete
0.2066 push_rt_task                0.2194 push_rt_task
0.1974 qla24xx_msix_default        0.2145 __aio_get_req
0.1935 generic_file_aio_read       0.2143 kfree
0.1870 scsi_device_unbusy          0.2138 __mod_timer
0.1861 tcp_sendmsg                 0.2131 e1000_irq_enable
0.1843 e1000_xmit_frame            0.2091 scsi_softirq_done


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