Miquel van Smoorenburg wrote:

> Now I tried 2.6.7-rc2 and -rc3 (well rc2-bk-latest-before-rc3) and
> with those kernels, performance goes to hell because no matter
> how much I tune, the kernel will throw out the mmap'ed pages first.
> RSS of the innd process hovers around 200-250 MB instead of 600.
> 
> Ideas ?
> 

Can you try the following patch please?