On Mon, 23 Mar 2009, Wu Fengguang wrote:

quoted

I think this was tracked back to the effective halving of 
dirty_ratio by 1cf6e7d83 ("mm: task dirty accounting fix") and 
doubling the ratio fixed the iozone regression.

Yes, exactly. The patch for fixing this regression is trivial.

I was planning on applying that patch only after 2.6.29 is out, and then 
if there are no surprising side effects and nobody complains, we'd then 
back-port it into stable.

		Linus