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Date: Wed, 19 Oct 2011 21:22:29 -0500
From: Kim Phillips <kim.phillips@...escale.com>
To: <netdev@...r.kernel.org>
Subject: IPsec performance bug
Hi,
I'm trying to debug an IPSec forwarding performance slowdown on a
p2020 dual-core powerpc linux box using s/w crypto (no crypto h/w
offload enabled) between vanilla kernel versions 2.6.35 and 3.0.
Using a h/w packet generator set to 64-byte packets, I get the
following results:
v2.6.35: 48.5kpps
v3.0.0: 0.2kpps
v3.0.7: 0.2kpps
v3.1.0-rc9-01707-gf7ba35d (a recent net-next): 13.6kpps
I was able to bisect the problem down to the following commit:
7e1dc7b6f709dfc1a9ab4b320dbe723f45992693 is the first bad commit
commit 7e1dc7b6f709dfc1a9ab4b320dbe723f45992693
Author: David S. Miller <davem@...emloft.net>
Date: Sat Mar 12 02:42:11 2011 -0500
net: Use flowi4 and flowi6 in xfrm layer.
Signed-off-by: David S. Miller <davem@...emloft.net>
And, indeed, going back one commit (i.e., v2.6.38-rc8-1468-g2032656
and manually applying commit 7313714: "xfrm: fix
__xfrm_route_forward ()"), brings performance back to ~50kpps from
0.2kpps.
Tracing shows that the commit breaks the route cache [1], and I
understand there is major surgery going on in the area [2], so I
suppose my question is twofold:
(a) was such a large performance drop to be expected for v3.0?
(b) any ideas how to fix? I don't know much about routing
internals, but in ip_route_input_common(), if I remove the input
interface comparison (rth->rt_route_iif ^ iif), I get some
performance back, but the system becomes unstable (it's booted over
nfs).
Thanks,
Kim
[1]
(a) ip_rcv() to xfrm4_output() WITHOUT "net: Use flowi4 and flowi6
in xfrm layer.":
0) | ip_rcv() {
0) | ip_route_input_common() {
0) 0.832 us | skb_dst_set_noref();
0) 2.672 us | }
0) | ip_forward() {
0) | __xfrm_policy_check() {
0) | __xfrm_decode_session() {
0) | xfrm_policy_get_afinfo() {
0) 0.864 us | _raw_read_lock();
0) 2.496 us | }
0) 1.008 us | _decode_session4();
0) 0.848 us | xfrm_policy_put_afinfo.clone.26();
0) 7.696 us | }
0) | flow_cache_lookup() {
0) 0.864 us | local_bh_disable();
0) 0.848 us | local_bh_enable();
0) 4.560 us | }
0) + 14.864 us | }
0) | __xfrm_route_forward() {
0) | __xfrm_decode_session() {
0) | xfrm_policy_get_afinfo() {
0) 0.816 us | _raw_read_lock();
0) 2.496 us | }
0) 0.912 us | _decode_session4();
0) 0.848 us | xfrm_policy_put_afinfo.clone.26();
0) 7.488 us | }
0) | xfrm_lookup() {
0) | flow_cache_lookup() {
0) 0.800 us | local_bh_disable();
0) | xfrm_bundle_flo_get() {
0) | xfrm_bundle_ok.clone.34() {
0) 0.944 us | ipv4_dst_check();
0) 0.800 us | ipv4_default_mtu();
0) 0.832 us | ipv4_dst_check();
0) 0.816 us | ipv4_default_mtu();
0) 7.664 us | }
0) 9.344 us | }
0) 0.832 us | local_bh_enable();
0) + 14.416 us | }
0) 0.832 us | get_seconds();
0) 0.864 us | dst_release();
0) + 19.552 us | }
0) + 29.664 us | }
0) | xfrm4_output() {
(b) ip_rcv() to xfrm4_output() WITH "net: Use flowi4 and flowi6 in
xfrm layer.":
0) | ip_rcv() {
0) | ip_route_input_common() {
0) | fib_lookup() {
0) | fib_rules_lookup() {
0) 0.912 us | fib4_rule_match();
0) | fib4_rule_action() {
0) 0.992 us | fib_get_table();
0) | fib_table_lookup() {
0) 0.976 us | check_leaf.clone.10();
0) 0.928 us | check_leaf.clone.10();
0) 5.872 us | }
0) 9.536 us | }
0) 0.832 us | fib4_rule_match();
0) | fib4_rule_action() {
0) 0.816 us | fib_get_table();
0) | fib_table_lookup() {
0) 1.280 us | check_leaf.clone.10();
0) 3.440 us | }
0) 6.720 us | }
0) + 22.944 us | }
0) + 25.344 us | }
0) | fib_validate_source() {
0) | fib_lookup() {
0) | fib_rules_lookup() {
0) 0.800 us | fib4_rule_match();
0) | fib4_rule_action() {
0) 0.880 us | fib_get_table();
0) | fib_table_lookup() {
0) 0.832 us | check_leaf.clone.10();
0) 2.688 us | }
0) 5.952 us | }
0) 0.816 us | fib4_rule_match();
0) | fib4_rule_action() {
0) 0.800 us | fib_get_table();
0) | fib_table_lookup() {
0) 1.168 us | check_leaf.clone.10();
0) 2.960 us | }
0) 6.160 us | }
0) + 17.808 us | }
0) + 19.392 us | }
0) + 21.424 us | }
0) | rt_dst_alloc() {
0) | dst_alloc() {
0) 1.200 us | kmem_cache_alloc();
0) 0.816 us | local_bh_disable();
0) 0.912 us | local_bh_enable();
0) 6.816 us | }
0) 8.496 us | }
0) | rt_set_nexthop.clone.37() {
0) 1.392 us | inet_getpeer();
0) 0.928 us | ipv4_default_mtu();
0) 5.424 us | }
0) | rt_intern_hash() {
0) | _raw_spin_lock_bh() {
0) 0.880 us | local_bh_disable();
0) 2.528 us | }
0) | call_rcu_bh() {
0) | __call_rcu() {
0) | force_quiescent_state() {
0) 0.816 us | _raw_spin_trylock();
0) 0.928 us | _raw_spin_lock();
0) | force_qs_rnp() {
0) 0.848 us | _raw_spin_lock_irqsave();
0) 0.960 us | dyntick_save_progress_counter();
0) 0.896 us | dyntick_save_progress_counter();
0) | rcu_report_qs_rnp() {
0) 0.816 us | _raw_spin_unlock_irqrestore();
0) 2.576 us | }
0) + 10.016 us | }
0) 0.816 us | _raw_spin_lock();
0) 0.832 us | _raw_spin_unlock_irqrestore();
0) + 19.088 us | }
0) + 21.216 us | }
0) + 23.824 us | }
0) | arp_bind_neighbour() {
0) | neigh_lookup() {
0) 0.784 us | local_bh_disable();
0) 0.992 us | arp_hash();
0) 0.928 us | local_bh_enable();
0) 7.568 us | }
0) 9.552 us | }
0) | _raw_spin_unlock_bh() {
0) 0.848 us | local_bh_enable_ip();
0) 2.496 us | }
0) ! 521.056 us | }
0) ! 971.952 us | }
0) | ip_forward() {
0) | __xfrm_policy_check() {
0) | __xfrm_decode_session() {
0) | xfrm_policy_get_afinfo() {
0) 0.864 us | _raw_read_lock();
0) 2.576 us | }
0) 1.248 us | _decode_session4();
0) 0.896 us | xfrm_policy_put_afinfo.clone.26();
0) 8.384 us | }
0) | flow_cache_lookup() {
0) 0.800 us | local_bh_disable();
0) 0.816 us | local_bh_enable();
0) 4.976 us | }
0) + 16.240 us | }
0) | __xfrm_route_forward() {
0) | __xfrm_decode_session() {
0) | xfrm_policy_get_afinfo() {
0) 0.912 us | _raw_read_lock();
0) 2.496 us | }
0) 0.928 us | _decode_session4();
0) 0.848 us | xfrm_policy_put_afinfo.clone.26();
0) 7.408 us | }
0) | xfrm_lookup() {
0) | flow_cache_lookup() {
0) 0.784 us | local_bh_disable();
0) 1.104 us | kmem_cache_alloc();
0) | xfrm_bundle_lookup() {
0) | xfrm_policy_lookup_bytype.clone.37() {
0) | _raw_read_lock_bh() {
0) 0.784 us | local_bh_disable();
0) 2.464 us | }
0) 1.312 us | xfrm_selector_match();
0) | _raw_read_unlock_bh() {
0) 0.880 us | local_bh_enable_ip();
0) 2.576 us | }
0) + 10.800 us | }
0) | xfrm_resolve_and_create_bundle() {
0) | xfrm_state_find() {
0) | _raw_spin_lock_bh() {
0) 0.832 us | local_bh_disable();
0) 2.544 us | }
0) | xfrm_state_look_at.clone.18() {
0) 1.136 us | xfrm_selector_match();
0) 2.912 us | }
0) | _raw_spin_unlock_bh() {
0) 0.800 us | local_bh_enable_ip();
0) 2.416 us | }
0) + 12.336 us | }
0) | xfrm_policy_get_afinfo() {
0) 0.816 us | _raw_read_lock();
0) 2.528 us | }
0) 0.816 us | xfrm4_get_tos();
0) 0.832 us | xfrm_policy_put_afinfo.clone.26();
0) | xfrm_policy_get_afinfo() {
0) 0.832 us | _raw_read_lock();
0) 2.496 us | }
0) | dst_alloc() {
0) 1.200 us | kmem_cache_alloc();
0) 0.800 us | local_bh_disable();
0) 0.816 us | local_bh_enable();
0) 6.400 us | }
0) 0.816 us | xfrm_policy_put_afinfo.clone.26();
0) | dst_cow_metrics_generic() {
0) 1.056 us | kmem_cache_alloc_trace();
0) 3.168 us | }
0) | xfrm_policy_get_afinfo() {
0) 0.816 us | _raw_read_lock();
0) 2.416 us | }
0) | xfrm4_dst_lookup() {
0) | __ip_route_output_key() {
0) 0.800 us | local_bh_disable();
0) 0.896 us | local_bh_enable();
0) 5.616 us | }
0) 7.264 us | }
0) 0.832 us | xfrm_policy_put_afinfo.clone.26();
0) | xfrm_policy_get_afinfo() {
0) 0.816 us | _raw_read_lock();
0) 2.496 us | }
0) 0.800 us | xfrm4_init_path();
0) 0.832 us | xfrm_policy_put_afinfo.clone.26();
0) 0.832 us | ipv4_default_mtu();
0) | xfrm_state_mtu() {
0) | _raw_spin_lock_bh() {
0) 0.800 us | local_bh_disable();
0) 2.448 us | }
0) 1.056 us | esp4_get_mtu();
0) | _raw_spin_unlock_bh() {
0) 0.832 us | local_bh_enable_ip();
0) 2.416 us | }
0) 9.312 us | }
0) 0.816 us | ipv4_default_mtu();
0) | xfrm_policy_get_afinfo() {
0) 0.816 us | _raw_read_lock();
0) 2.496 us | }
0) 1.088 us | xfrm4_fill_dst();
0) 0.832 us | xfrm_policy_put_afinfo.clone.26();
0) + 79.488 us | }
0) + 93.104 us | }
0) 0.816 us | local_bh_enable();
0) ! 101.120 us | }
0) 0.816 us | get_seconds();
0) 0.976 us | dst_release();
0) ! 106.640 us | }
0) ! 116.656 us | }
0) | xfrm4_output() {
[2] http://vger.kernel.org/netconf2011_slides/davem_netconf2011.pdf
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