Re: [PATCH] mlx4: allocate just enough pages instead of always 4 pages

[David Miller <davem@davemloft.net>]

From: Thadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com>
Date: Wed,  4 Apr 2012 16:40:40 -0300

> The driver uses a 2-order allocation, which is too much on architectures
> like ppc64, which has a 64KiB page. This particular allocation is used
> for large packet fragments that may have a size of 512, 1024, 4096 or
> fill the whole allocation. So, a minimum size of 16384 is good enough
> and will be the same size that is used in architectures of 4KiB sized
> pages.
> 
> This will avoid allocation failures that we see when the system is under
> stress, but still has plenty of memory, like the one below.
> 
> This will also allow us to set the interface MTU to higher values like
> 9000, which was not possible on ppc64 without this patch.
 ...
> Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com>
> Signed-off-by: Kleber Sacilotto de Souza <klebers@linux.vnet.ibm.com>
> Tested-by: Kleber Sacilotto de Souza <klebers@linux.vnet.ibm.com>

Applied, thanks a lot.