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SubjectMainline kernel OLTP performance update
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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