tun: align write-heavy flow entry members to a cache line

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tun flow entry 'updated' fields are written when receive
every packet. Thus if a flow is receiving packets from a
particular flow entry, it'll cause false-sharing with
all the other who has looked it up, so move it in its own
cache line

and update 'queue_index' and 'update' field only when
they are changed to reduce the cache false-sharing.

Signed-off-by: Zhang Yu <zhangyu31@baidu.com>
Signed-off-by: Wang Li <wangli39@baidu.com>
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

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Li RongQing 2018-12-06 16:08:17 +08:00 • committed by David S. Miller

parent 7a35a50df5

commit 83b1bc122c

1 changed files with 5 additions and 3 deletions

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drivers/net/tun.c

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