From c8c8b127091b758f5768f906bcdeeb88bc9951ca Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Wed, 7 Dec 2016 09:19:33 -0800 Subject: udp: under rx pressure, try to condense skbs Under UDP flood, many softirq producers try to add packets to UDP receive queue, and one user thread is burning one cpu trying to dequeue packets as fast as possible. Two parts of the per packet cost are : - copying payload from kernel space to user space, - freeing memory pieces associated with skb. If socket is under pressure, softirq handler(s) can try to pull in skb->head the payload of the packet if it fits. Meaning the softirq handler(s) can free/reuse the page fragment immediately, instead of letting udp_recvmsg() do this hundreds of usec later, possibly from another node. Additional gains : - We reduce skb->truesize and thus can store more packets per SO_RCVBUF - We avoid cache line misses at copyout() time and consume_skb() time, and avoid one put_page() with potential alien freeing on NUMA hosts. This comes at the cost of a copy, bounded to available tail room, which is usually small. (We might have to fix GRO_MAX_HEAD which looks bigger than necessary) This patch gave me about 5 % increase in throughput in my tests. skb_condense() helper could probably used in other contexts. Signed-off-by: Eric Dumazet Cc: Paolo Abeni Signed-off-by: David S. Miller --- net/core/skbuff.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) (limited to 'net/core') diff --git a/net/core/skbuff.c b/net/core/skbuff.c index b45cd1494243..84151cf40aeb 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -4931,3 +4931,31 @@ struct sk_buff *pskb_extract(struct sk_buff *skb, int off, return clone; } EXPORT_SYMBOL(pskb_extract); + +/** + * skb_condense - try to get rid of fragments/frag_list if possible + * @skb: buffer + * + * Can be used to save memory before skb is added to a busy queue. + * If packet has bytes in frags and enough tail room in skb->head, + * pull all of them, so that we can free the frags right now and adjust + * truesize. + * Notes: + * We do not reallocate skb->head thus can not fail. + * Caller must re-evaluate skb->truesize if needed. + */ +void skb_condense(struct sk_buff *skb) +{ + if (!skb->data_len || + skb->data_len > skb->end - skb->tail || + skb_cloned(skb)) + return; + + /* Nice, we can free page frag(s) right now */ + __pskb_pull_tail(skb, skb->data_len); + + /* Now adjust skb->truesize, since __pskb_pull_tail() does + * not do this. + */ + skb->truesize = SKB_TRUESIZE(skb_end_offset(skb)); +} -- cgit v1.2.3