Messages in this thread | | | Date | Tue, 15 Nov 2005 20:31:52 -0800 | From | William Lee Irwin III <> | Subject | Re: mmap over nfs leads to excessive system load |
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On Tue, Nov 15, 2005 at 03:47:30PM -0800, Kenny Simpson wrote: > CPU: P4 / Xeon with 2 hyper-threads, speed 2658.47 MHz (estimated) > Counted GLOBAL_POWER_EVENTS events (time during which processor is not stopped) with a unit mask > of 0x01 (mandatory) count 100000 > samples % symbol name > 412585 14.6687 find_get_pages_tag > 343898 12.2267 mpage_writepages > 290144 10.3155 release_pages > 288631 10.2617 unlock_page > 286181 10.1746 pci_conf1_write > 267619 9.5147 clear_page_dirty_for_io > 128128 4.5554 __lookup_tag > 120895 4.2982 page_waitqueue > 52739 1.8750 _spin_lock_irqsave > 43623 1.5509 skb_copy_bits > 30157 1.0722 __wake_up_bit > 29973 1.0656 _read_lock_irqsave
67%, or 2/3 of the samples, are in the top 6 functions. Have you tried instruction-level profiling? It would be interesting to see what codepaths within the functions are the largest offenders.
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