[E1000-devel] Query performance issue when using igb driver

[Yan, L. (N. - CN/Hangzhou) <lim...@ns...>]

Hi,
  When I use igb driver to receive Ethernet packets, I found even if I send packet with only 1000 bytes length(MTU=1500), the received packets are non-linear.  So I have to use skb_linearize to make it linear again in my module.  Skb_linearize is a complicated process and there may be memory copying there so I think this will decrease the performance much.  I searched network and found there's a macro 'CONFIG_IGB_DISABLE_PACKET_SPLIT' in igb driver that can be defined to disable the non-linear feature. 
   Could anybody give comments for this?  If I need linear buffer for received packets, shall I always define ' CONFIG_IGB_DISABLE_PACKET_SPLIT' ?  Will this definition make my performance higher in my case? 


# ethtool -i bi0
driver: igb
version: 2.4.12
firmware-version: 2.1-3