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net: Convert NAPI gro list into a small hash table.

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Improve the performance of GRO receive by splitting flows into
multiple hash chains.

Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Miller 2018-06-24 14:14:02 +09:00 • committed by David S. Miller
commit 07d78363dc
2 changed files with 81 additions and 27 deletions
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3
include/linux/netdevice.h
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@ -305,6 +305,7 @@ int __init netdev_boot_setup(char *str);
/*
* Structure for NAPI scheduling similar to tasklet but with weighting
*/
#define GRO_HASH_BUCKETS 8
struct napi_struct {
/* The poll_list must only be managed by the entity which
* changes the state of the NAPI_STATE_SCHED bit. This means
@ -322,7 +323,7 @@ struct napi_struct {
int poll_owner;
#endif
struct net_device *dev;
struct list_head gro_list;
struct list_head gro_hash[GRO_HASH_BUCKETS];
struct sk_buff *skb;
struct hrtimer timer;
struct list_head dev_list;