Anirban Chakraborty <anirban.chakraborty@xxxxxxxxxx> writes: > Can you please try the attached patch? Yes, results below. > Also, what f/w version are you running with? [root@linux-srv2 ~]# cat /sys/class/scsi_host/host23/fw_version 4.00.27 (82) > What tool are you using to generate the load? Industry-standard OLTP benchmark from tpc.org (vendor proprietary database). ----------------- Summary: Measured performance impact of perf.patch No impact on throughput, interrupts or cpu usage. Take oprofile data with a grain of sand; notice 3% drop in cycles for <database> with no change in vmstat cpu utilization (oprofile accuracy is the subject of another thread). Linux OLTP Performance summary Kernel# Speedup(x) Intr/s CtxSw/s us% sys% idle% iowait% 2.6.30-rc3 1.000 30645 43027 75 25 0 0 2.6.30-rc3_qla2xxx_p 1.000 30612 43178 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% 2.6.30-rc3 Cycles% 2.6.30-rc3_qla2xxx 69.1925 <database> 66.1187 <database> 1.1314 qla24xx_intr_handler 1.2120 qla24xx_start_scsi 1.0031 qla24xx_start_scsi 1.0710 qla24xx_intr_handler 0.8476 __schedule 0.9050 kmem_cache_alloc 0.6532 kmem_cache_alloc 0.8729 __schedule 0.4490 __blockdev_direct_IO 0.4659 __blockdev_direct_IO 0.4199 __sigsetjmp 0.4284 __sigsetjmp 0.3946 __switch_to 0.4123 __switch_to 0.3538 __list_add 0.3856 kstat_irqs_cpu 0.3499 task_rq_lock 0.3802 scsi_request_fn 0.3402 scsi_request_fn 0.3749 task_rq_lock 0.3382 rb_get_reader_page 0.3552 __list_add 0.3363 copy_user_generic_string 0.3516 rb_get_reader_page 0.3324 aio_complete 0.3481 aio_complete 0.3110 try_to_wake_up 0.3124 ring_buffer_consume 0.2877 ring_buffer_consume 0.3052 try_to_wake_up 0.2683 mod_timer 0.2874 memset_c 0.2605 qla2x00_process_completed_re0.2802 tcp_sendmsg 0.2566 blk_queue_end_tag 0.2624 copy_user_generic_string 0.2566 generic_make_request 0.2570 kfree 0.2547 tcp_sendmsg 0.2570 lock_timer_base 0.2372 lock_timer_base 0.2553 blk_queue_end_tag 0.2333 memmove 0.2535 qla2x00_process_completed_re 0.2294 memset_c 0.2463 mod_timer 0.2080 mempool_free 0.2392 generic_make_request 0.2022 generic_file_aio_read 0.2267 scsi_device_unbusy 0.1963 scsi_device_unbusy 0.2213 mempool_free 0.1963 plist_del 0.2160 kref_get 0.1944 dequeue_rt_stack 0.2088 memmove 0.1924 e1000_xmit_frame 0.2017 kmem_cache_free -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
