[lkml]   [2006]   [Aug]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: problems with e1000 and jumboframes

On Thu, 3 Aug 2006, Evgeniy Polyakov wrote:
>> Why? After your explanation that makes sense for me. The driver needs
>> one contiguous chunk for those 9k packet buffer and thus requests a
>> 3-order page of 16k. Or do i still do not understand this?
> Correct, except that it wants 32k.
> e1000 logic is following:
> align frame size to power-of-two,

> then skb_alloc adds a little
> (sizeof(struct skb_shared_info)) at the end, and this ends up
> in 32k request just for 9k jumbo frame.

Strange, why this skb_shared_info cannon be added before first alignment?
And what about smaller frames like 1500, does this driver behave similar
(first align then add)?

Best regards,

Krzysztof Olędzki
 \ /
  Last update: 2006-08-03 17:13    [W:0.060 / U:0.676 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site