Commit ec7d2f2c authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

net: __alloc_skb() speedup 



With following patch I can reach maximum rate of my pktgen+udpsink
simulator :
- 'old' machine : dual quad core E5450  @3.00GHz
- 64 UDP rx flows (only differ by destination port)
- RPS enabled, NIC interrupts serviced on cpu0
- rps dispatched on 7 other cores. (~130.000 IPI per second)
- SLAB allocator (faster than SLUB in this workload)
- tg3 NIC
- 1.080.000 pps without a single drop at NIC level.

Idea is to add two prefetchw() calls in __alloc_skb(), one to prefetch
first sk_buff cache line, the second to prefetch the shinfo part.

Also using one memset() to initialize all skb_shared_info fields instead
of one by one to reduce number of instructions, using long word moves.

All skb_shared_info fields before 'dataref' are cleared in 
__alloc_skb().

Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 8753d29f

include/linux/skbuff.h

+6 −1
Original line number Diff line number Diff line
@@ -187,7 +187,6 @@ union skb_shared_tx { 
 * the end of the header data, ie. at skb->end.

 */

struct skb_shared_info {

	atomic_t	dataref;

	unsigned short	nr_frags;

	unsigned short	gso_size;

	/* Warning: this field is not always filled in (UFO)! */
@@ -197,6 +196,12 @@ struct skb_shared_info { 
	union skb_shared_tx tx_flags;

	struct sk_buff	*frag_list;

	struct skb_shared_hwtstamps hwtstamps;



	/*

	 * Warning : all fields before dataref are cleared in __alloc_skb()

	 */

	atomic_t	dataref;



	skb_frag_t	frags[MAX_SKB_FRAGS];

	/* Intermediate layers must ensure that destructor_arg

	 * remains valid until skb destructor */

net/core/skbuff.c

+5 −16
Original line number Diff line number Diff line
@@ -181,12 +181,14 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask, 
	skb = kmem_cache_alloc_node(cache, gfp_mask & ~__GFP_DMA, node);

	if (!skb)

		goto out;

	prefetchw(skb);



	size = SKB_DATA_ALIGN(size);

	data = kmalloc_node_track_caller(size + sizeof(struct skb_shared_info),

			gfp_mask, node);

	if (!data)

		goto nodata;

	prefetchw(data + size);



	/*

	 * Only clear those fields we need to clear, not those that we will
@@ -208,15 +210,8 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask, 


	/* make sure we initialize shinfo sequentially */

	shinfo = skb_shinfo(skb);

	memset(shinfo, 0, offsetof(struct skb_shared_info, dataref));

	atomic_set(&shinfo->dataref, 1);

	shinfo->nr_frags  = 0;

	shinfo->gso_size = 0;

	shinfo->gso_segs = 0;

	shinfo->gso_type = 0;

	shinfo->ip6_frag_id = 0;

	shinfo->tx_flags.flags = 0;

	skb_frag_list_init(skb);

	memset(&shinfo->hwtstamps, 0, sizeof(shinfo->hwtstamps));



	if (fclone) {

		struct sk_buff *child = skb + 1;
@@ -505,16 +500,10 @@ int skb_recycle_check(struct sk_buff *skb, int skb_size) 
		return 0;



	skb_release_head_state(skb);



	shinfo = skb_shinfo(skb);

	memset(shinfo, 0, offsetof(struct skb_shared_info, dataref));

	atomic_set(&shinfo->dataref, 1);

	shinfo->nr_frags = 0;

	shinfo->gso_size = 0;

	shinfo->gso_segs = 0;

	shinfo->gso_type = 0;

	shinfo->ip6_frag_id = 0;

	shinfo->tx_flags.flags = 0;

	skb_frag_list_init(skb);

	memset(&shinfo->hwtstamps, 0, sizeof(shinfo->hwtstamps));



	memset(skb, 0, offsetof(struct sk_buff, tail));

	skb->data = skb->head + NET_SKB_PAD;

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