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authorJesse Brandeburg <jesse.brandeburg@intel.com>2009-07-06 10:44:39 +0000
committerDavid S. Miller <davem@davemloft.net>2009-07-06 18:07:51 -0700
commitedbbb3ca107715067b27a71e6ea7f58750912aa2 (patch)
tree4b9772ff2dc239ad61812cce4b4e6249a25512a2 /scripts/headers_check.pl
parent94c9e5a89349a1f1ebabe0876c059dc387b8b2a0 (diff)
e1000: implement jumbo receive with partial descriptors
This is code extremely similar to what is committed in e1000e already. e1000 will no longer request 32kB slab buffers to support jumbo frames on PCI/PCI-X adapters. This will significantly reduce the likelyhood of order:3 allocation failures. This new code adds support for using pages as receive buffers, and the driver will chain multiple pages together to build a jumbo frame for OS consumption. The hardware takes a power of two buffer size and will dump as much data as it can receive into 1 or more buffers. The benefits of applying this are 1) stop akpm's dissing :-) of this lame e1000 behavior [1] 2) more efficient memory allocation (half) when using jumbo frames, which will also allow for much better socket utilization with jumbos since the socket is charged for the full allocation of each receive buffer, regardless of how much is used. 3) this was a feature request by a customer 4) copybreak for small packets < 256 bytes still applies [1] http://lkml.org/lkml/2008/7/10/68 http://article.gmane.org/gmane.linux.network/130986 Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com> CC: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'scripts/headers_check.pl')
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