On 27 Mar 2007 17:01:01 +0200, Andi Kleen <[EMAIL PROTECTED]> wrote:
What is the problem? You have cache misses on the the hash table or are the instructions really an issue on a modern CPU?
It was page_to_pfn() on numa system. I think it's cache misses on per node pgdat lookup with node index calculation on each pipe buffer page.
e.g. i out of lined virt_to_page to save space, but it could be probably inlined again if it was severly time critical.
That would be a problem too, though not showing up in the pipe code path. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
