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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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