This is based on Stephen's v4.14 patches, with the necessary merge conflicts, and the lack of timer_setup() on the 4.9 baseline.
Perf results on a gigabit capable system, before and after are below.
Series can also be found here:
https://github.com/ffainelli/linux/commits/fragment-stack-v4.9-v2
Changes in v2:
- drop "net: sk_buff rbnode reorg" - added original "ip: use rb trees for IP frag queue." commit
Before patches:
PerfTop: 180 irqs/sec kernel:78.9% exact: 0.0% [4000Hz cycles:ppp], (all, 4 CPUs) -------------------------------------------------------------------------------
34.81% [kernel] [k] ip_defrag 4.57% [kernel] [k] arch_cpu_idle 2.09% [kernel] [k] fib_table_lookup 1.74% [kernel] [k] finish_task_switch 1.57% [kernel] [k] v7_dma_inv_range 1.47% [kernel] [k] __netif_receive_skb_core 1.06% [kernel] [k] __slab_free 1.04% [kernel] [k] __netdev_alloc_skb 0.99% [kernel] [k] ip_route_input_noref 0.96% [kernel] [k] dev_gro_receive 0.96% [kernel] [k] tick_nohz_idle_enter 0.93% [kernel] [k] bcm_sysport_poll 0.92% [kernel] [k] skb_release_data 0.91% [kernel] [k] __memzero 0.90% [kernel] [k] __free_page_frag 0.87% [kernel] [k] ip_rcv 0.77% [kernel] [k] eth_type_trans 0.71% [kernel] [k] _raw_spin_unlock_irqrestore 0.68% [kernel] [k] tick_nohz_idle_exit 0.65% [kernel] [k] bcm_sysport_rx_refill
After patches:
PerfTop: 214 irqs/sec kernel:80.4% exact: 0.0% [4000Hz cycles:ppp], (all, 4 CPUs) -------------------------------------------------------------------------------
6.61% [kernel] [k] arch_cpu_idle 3.77% [kernel] [k] ip_defrag 3.65% [kernel] [k] v7_dma_inv_range 3.18% [kernel] [k] fib_table_lookup 3.04% [kernel] [k] __netif_receive_skb_core 2.31% [kernel] [k] finish_task_switch 2.31% [kernel] [k] _raw_spin_unlock_irqrestore 1.65% [kernel] [k] bcm_sysport_poll 1.63% [kernel] [k] ip_route_input_noref 1.63% [kernel] [k] __memzero 1.58% [kernel] [k] __netdev_alloc_skb 1.47% [kernel] [k] tick_nohz_idle_enter 1.40% [kernel] [k] __slab_free 1.32% [kernel] [k] ip_rcv 1.32% [kernel] [k] __softirqentry_text_start 1.30% [kernel] [k] dev_gro_receive 1.23% [kernel] [k] bcm_sysport_rx_refill 1.11% [kernel] [k] tick_nohz_idle_exit 1.06% [kernel] [k] memcmp 1.02% [kernel] [k] dma_cache_maint_page
Dan Carpenter (1): ipv4: frags: precedence bug in ip_expire()
Eric Dumazet (21): inet: frags: change inet_frags_init_net() return value inet: frags: add a pointer to struct netns_frags inet: frags: refactor ipfrag_init() inet: frags: refactor ipv6_frag_init() inet: frags: refactor lowpan_net_frag_init() ipv6: export ip6 fragments sysctl to unprivileged users rhashtable: add schedule points inet: frags: use rhashtables for reassembly units inet: frags: remove some helpers inet: frags: get rif of inet_frag_evicting() inet: frags: remove inet_frag_maybe_warn_overflow() inet: frags: break the 2GB limit for frags storage inet: frags: do not clone skb in ip_expire() ipv6: frags: rewrite ip6_expire_frag_queue() rhashtable: reorganize struct rhashtable layout inet: frags: reorganize struct netns_frags inet: frags: get rid of ipfrag_skb_cb/FRAG_CB inet: frags: fix ip6frag_low_thresh boundary net: speed up skb_rbtree_purge() net: pskb_trim_rcsum() and CHECKSUM_COMPLETE are friends net: add rb_to_skb() and other rb tree helpers
Florian Westphal (1): ipv6: defrag: drop non-last frags smaller than min mtu
Peter Oskolkov (5): ip: discard IPv4 datagrams with overlapping segments. net: modify skb_rbtree_purge to return the truesize of all purged skbs. ip: use rb trees for IP frag queue. ip: add helpers to process in-order fragments faster. ip: process in-order fragments efficiently
Taehee Yoo (1): ip: frags: fix crash in ip_do_fragment()
Documentation/networking/ip-sysctl.txt | 13 +- include/linux/rhashtable.h | 4 +- include/linux/skbuff.h | 34 +- include/net/inet_frag.h | 133 +++--- include/net/ip.h | 1 - include/net/ipv6.h | 26 +- include/uapi/linux/snmp.h | 1 + lib/rhashtable.c | 5 +- net/core/skbuff.c | 31 +- net/ieee802154/6lowpan/6lowpan_i.h | 26 +- net/ieee802154/6lowpan/reassembly.c | 148 +++--- net/ipv4/inet_fragment.c | 379 ++++------------ net/ipv4/ip_fragment.c | 573 +++++++++++++----------- net/ipv4/proc.c | 7 +- net/ipv4/tcp_input.c | 33 +- net/ipv6/netfilter/nf_conntrack_reasm.c | 100 ++--- net/ipv6/proc.c | 5 +- net/ipv6/reassembly.c | 212 ++++----- 18 files changed, 774 insertions(+), 957 deletions(-)