* [PATCH] net: make struct net_device::min_header_len 8-bit
@ 2017-04-10 8:25 Alexey Dobriyan
2017-04-12 17:59 ` David Miller
0 siblings, 1 reply; 2+ messages in thread
From: Alexey Dobriyan @ 2017-04-10 8:25 UTC (permalink / raw)
To: davem; +Cc: netdev
This field is never big enough to warrant 16-bitness.
8-bit accesses enjoy shorted encoding on i386/x86_64 than 16-bit
accesses:
add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-10 (-10)
function old new delta
loopback_setup 169 164 -5
ether_setup 148 143 -5
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---
include/linux/netdevice.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1715,7 +1715,7 @@ struct net_device {
unsigned int max_mtu;
unsigned short type;
unsigned short hard_header_len;
- unsigned short min_header_len;
+ unsigned char min_header_len;
unsigned short needed_headroom;
unsigned short needed_tailroom;
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2017-04-10 8:25 [PATCH] net: make struct net_device::min_header_len 8-bit Alexey Dobriyan
2017-04-12 17:59 ` David Miller
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