include/linux/etherdevice.h | 42 ++++++++++++++++++++++++++++++++++++++++++
net/ethernet/eth.c | 6 +++---
2 files changed, 45 insertions(+), 3 deletions(-)
New commits:
commit caddec8cb893f296b4eb594f0a66b56367c4dfe0
Author: Eric Dumazet <[EMAIL PROTECTED]>
Date: Sun Nov 23 23:24:32 2008 -0800
eth: Declare an optimized compare_ether_addr_64bits() function
Linus mentioned we could try to perform long word operations, even
on potentially unaligned addresses, on x86 at least. David mentioned
the HAVE_EFFICIENT_UNALIGNED_ACCESS test to handle this on all
arches that have efficient unailgned accesses.
I tried this idea and got nice assembly on 32 bits:
158: 33 82 38 01 00 00 xor 0x138(%edx),%eax
15e: 33 8a 34 01 00 00 xor 0x134(%edx),%ecx
164: c1 e0 10 shl $0x10,%eax
167: 09 c1 or %eax,%ecx
169: 74 0b je 176 <eth_type_trans+0x87>
And very nice assembly on 64 bits of course (one xor, one shl)
Nice oprofile improvement in eth_type_trans(), 0.17 % instead of 0.41 %,
expected since we remove 8 instructions on a fast path.
This patch implements a compare_ether_addr_64bits() function, that
uses the CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS ifdef to efficiently
perform the 6 bytes comparison on all capable arches.
Signed-off-by: Eric Dumazet <[EMAIL PROTECTED]>
Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
http://suva.vyatta.com/git/?p=linux-vyatta.git;a=commitdiff;h=caddec8cb893f296b4eb594f0a66b56367c4dfe0
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