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net: convert gro_count to bitmask

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gro_hash size is 192 bytes, and uses 3 cache lines, if there is few
flows, gro_hash may be not fully used, so it is unnecessary to iterate
all gro_hash in napi_gro_flush(), to occupy unnecessary cacheline.

convert gro_count to a bitmask, and rename it as gro_bitmask, each bit
represents a element of gro_hash, only flush a gro_hash element if the
related bit is set, to speed up napi_gro_flush().

and update gro_bitmask only if it will be changed, to reduce cache
update

Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Cc: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Li RongQing
2018-07-13 14:41:36 +08:00
committed by David S. Miller
parent 48559af345
commit d9f37d01e2
2 changed files with 31 additions and 14 deletions
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9
include/linux/netdevice.h
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@@ -308,9 +308,14 @@ struct gro_list {
};
/*
* Structure for NAPI scheduling similar to tasklet but with weighting
* size of gro hash buckets, must less than bit number of
* napi_struct::gro_bitmask
*/
#define GRO_HASH_BUCKETS 8
/*
* Structure for NAPI scheduling similar to tasklet but with weighting
*/
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 +327,7 @@ struct napi_struct {
unsigned long state;
int weight;
unsigned int gro_count;
unsigned long gro_bitmask;
int (*poll)(struct napi_struct *, int);
#ifdef CONFIG_NETPOLL
int poll_owner;