On Tue, 2005-11-08 at 11:25 -0800, Kenny Simpson wrote:
> Just another data point....
> If I open the file with O_DIRECT.. not much changes:
Hmm... Are you mounting using the -osync or -onoac options? Doing
synchronous writes will tend to slow down flushing considerably, and the
VM appears to be very fragile w.r.t. slow filesystems.
Cheers,
Trond
> samples % image name app name symbol name
> 12585321 18.9373 vmlinux-2.6.14 vmlinux-2.6.14 find_get_pages_tag
> 8608887 12.9539 vmlinux-2.6.14 vmlinux-2.6.14 mpage_writepages
> 6870600 10.3383 vmlinux-2.6.14 vmlinux-2.6.14 unlock_page
> 6605417 9.9393 vmlinux-2.6.14 vmlinux-2.6.14 clear_page_dirty_for_io
> 6259207 9.4183 vmlinux-2.6.14 vmlinux-2.6.14 release_pages
> 3249493 4.8896 vmlinux-2.6.14 vmlinux-2.6.14 __lookup_tag
> 3248871 4.8886 vmlinux-2.6.14 vmlinux-2.6.14 pci_conf1_write
> 2677914 4.0295 vmlinux-2.6.14 vmlinux-2.6.14 page_waitqueue
> 982811 1.4789 vmlinux-2.6.14 vmlinux-2.6.14 _read_lock_irqsave
> 917165 1.3801 vmlinux-2.6.14 vmlinux-2.6.14 _read_unlock_irq
> 758960 1.1420 vmlinux-2.6.14 vmlinux-2.6.14 __wake_up_bit
> 706607 1.0632 vmlinux-2.6.14 vmlinux-2.6.14 _spin_lock_irqsave
>
>
> -Kenny
>
>
>
>
>
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