I ran the same test again against 2.6.15-rc, and got pretty much the same thing. It starts nice
and fast (30+MB/s, but drops down to under 10MB/s with the system time pegging one CPU).
Here is the oprofile result:
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
-Kenny
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