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SubjectMainline kernel OLTP performance update
Here is an OLTP performance summary comparing 2.6.33-rc4 to Red Hat EL5.4 release. Both kernels were compiled using the same EL5.4 .config to minimize configuration differences.

Comparing to RHEL 5.4 baseline, 2.6.33-rc4 kernel has around 0.8% OLTP performance regression.

Linux OLTP Performance summary
Kernel# Speedup(x) Intr/s CtxSw/s us% sys% idle% iowait%
2.6.18-164.el5(RHEL5.4) 1.000 144080 181307 68 28 1 4
2.6.32.1 0.983 248305 174940 67 32 0 1
2.6.33-rc4 0.992 221354 180750 68 30 0 2

Hardware configuration
NHM-EP 2.93GHz 2 sockets/8 cores/16 threads
72GB memory
4x LSI 3801SAS + 2x QLA2300, 192 SSDs + 28 spindles log

======oprofile CPU_CLK_UNHALTED for top 30 functions
Cycles% 2.6.18-164.el5 Cycles% 2.6.33-rc4
70.5642 <dbms> 69.4350 <dbms>
1.4696 mpt_interrupt 0.9540 mpt_interrupt
0.9001 kmem_cache_free 0.7649 scsi_request_fn
0.7807 schedule 0.6990 __blockdev_direct_IO
0.7769 __blockdev_direct_IO 0.6729 schedule
0.6053 scsi_request_fn 0.6721 kmem_cache_alloc
0.5003 kmem_cache_alloc 0.6245 kmem_cache_free
0.4355 kmem_cache_zalloc 0.4556 pick_next_highest_task_rt
0.4090 list_del 0.3538 __switch_to
0.3570 gup_huge_pmd 0.3397 memmove
0.3452 __switch_to 0.3339 rb_get_reader_page
0.3399 kfree 0.3318 try_to_wake_up
0.3371 task_rq_lock 0.3309 sd_prep_fn
0.3173 __sigsetjmp 0.3219 list_del
0.3153 memmove 0.3217 ring_buffer_consume
0.2869 lock_timer_base 0.3100 kfree
0.2851 generic_make_request 0.3085 __sigsetjmp
0.2613 scsi_get_command 0.3073 mptscsih_qcmd
0.2599 __generic_file_aio_read 0.2810 scsi_device_unbusy
0.2567 fget_light 0.2727 generic_make_request
0.2434 mptscsih_io_done 0.2510 touch_atime
0.2413 touch_atime 0.2480 generic_file_aio_read
0.2380 get_request 0.2453 memset_c
0.2282 try_to_wake_up 0.2448 fget_light
0.2248 mptscsih_qcmd 0.2218 dequeue_rt_stack
0.2196 sd_init_command 0.2140 sys_io_submit
0.2035 device_not_available 0.2063 scsi_dispatch_cmd
0.2032 elv_queue_empty 0.2027 _setjmp
0.2007 __errno_location 0.1996 mptscsih_io_done
0.2006 math_state_restore 0.1973 gup_huge_pmd
0.2003 _setjmp 0.1908 __list_add
0.1995 kref_get 0.1880 submit_page_section
0.1979 mempool_alloc 0.1879 task_rq_lock
0.1965 scsi_prep_fn 0.1856 __errno_location








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