(no subject)

quoted

905182 total                                      0.4741
121426 csum_partial_copy_generic                474.3203

Well, maybe take a look at this func and try to optimize it?

I don't know assembly that good - sorry.

quoted

 93633 default_idle                             1800.6346
 74665 do_wp_page                               111.1086

What's this?

do_wp_page is Defined as a function in: mm/memory.c

comments from the file:

/*
 * This routine handles present pages, when users try to write
 * to a shared page. It is done by copying the page to a new address
 * and decrementing the shared-page counter for the old page.
 *
 * Goto-purists beware: the only reason for goto's here is that it results
 * in better assembly code.. The "default" path will see no jumps at all.
 *
 * Note that this routine assumes that the protection checks have been
 * done by the caller (the low-level page fault routine in most cases).
 * Thus we can safely just mark it writable once we've done any necessary
 * COW.
 *
 * We also mark the page dirty at this point even though the page will
 * change only once the write actually happens. This avoids a few races,
 * and potentially makes it more efficient.
 *
 * We hold the mm semaphore and the page_table_lock on entry and exit
 * with the page_table_lock released.
 */

quoted

 65857 ide_intr                                 184.9916

You have 1 ide_intr per 2 csum_partial_copy_generic... hmmm...
how large is your readahead? I assume you'd like to fetch
more sectors from ide per interrupt. (I hope you do DMA ;)

doing DMA - RAID-0 with 1MB chunk size on 4 disks.

quoted

 53636 handle_IRQ_event                         432.5484
 21973 do_softirq                               107.7108
 20498 e1000_intr                               244.0238

I know zero about networking, but why 120 000 csum_partial_copy_generic
and inly 20 000 nic interrupts? That may be abnormal.

sorry
I don't know

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