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fa0f5aa743
linux/net/sched
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Eric Dumazet fa0f5aa743 net_sched: qdisc_alloc_handle() can be too slow 
When trying to allocate ~32768 qdiscs using autohandle mechanism, we can
fill the space managed by kernel (handles in [8000-FFFF]:0000 range)

But O(N^2) qdisc_alloc_handle() loops 0x10000 times instead of 0x8000

time tc add qdisc add dev eth0 parent 10:7fff pfifo limit 10
RTNETLINK answers: Cannot allocate memory
real    1m54.826s
user    0m0.000s
sys     0m0.004s

INFO: rcu_sched_state detected stall on CPU 0 (t=60000 jiffies)

Half number of loops, and add a cond_resched() call.
We hold rtnl at this point.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Dave Taht <dave.taht@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-01-03 13:03:20 -05:00
..
act_api.c net: Fix files explicitly needing to include module.h 2011-10-31 19:30:28 -04:00
act_csum.c net: sched: constify tcf_proto and tc_action 2011-07-06 02:52:16 -07:00
act_gact.c net: sched: constify tcf_proto and tc_action 2011-07-06 02:52:16 -07:00
act_ipt.c net: sched: constify tcf_proto and tc_action 2011-07-06 02:52:16 -07:00
act_mirred.c net_sched: fix port mirror/redirect stats reporting 2011-08-17 20:10:20 -07:00
act_nat.c net: sched: constify tcf_proto and tc_action 2011-07-06 02:52:16 -07:00
act_pedit.c net: sched: constify tcf_proto and tc_action 2011-07-06 02:52:16 -07:00
act_police.c net: sched: constify tcf_proto and tc_action 2011-07-06 02:52:16 -07:00
act_simple.c net: sched: constify tcf_proto and tc_action 2011-07-06 02:52:16 -07:00
act_skbedit.c net: sched: constify tcf_proto and tc_action 2011-07-06 02:52:16 -07:00
cls_api.c net: sched: constify tcf_proto and tc_action 2011-07-06 02:52:16 -07:00
cls_basic.c net: sched: constify tcf_proto and tc_action 2011-07-06 02:52:16 -07:00
cls_cgroup.c net: sched: constify tcf_proto and tc_action 2011-07-06 02:52:16 -07:00
cls_flow.c cls_flow: remove one dynamic array 2011-12-14 13:34:55 -05:00
cls_fw.c net: sched: constify tcf_proto and tc_action 2011-07-06 02:52:16 -07:00
cls_route.c net: sched: constify tcf_proto and tc_action 2011-07-06 02:52:16 -07:00
cls_rsvp6.c [NET_SCHED]: Remove unnecessary includes 2007-07-10 22:16:41 -07:00
cls_rsvp.c [NET_SCHED]: Remove unnecessary includes 2007-07-10 22:16:41 -07:00
cls_rsvp.h pkt_sched: cls_rsvp.h was outdated 2011-09-15 14:49:43 -04:00
cls_tcindex.c net: sched: constify tcf_proto and tc_action 2011-07-06 02:52:16 -07:00
cls_u32.c net: sched: constify tcf_proto and tc_action 2011-07-06 02:52:16 -07:00
em_cmp.c net_sched: cleanups 2011-01-19 23:31:12 -08:00
em_meta.c net: remove SK_ROUTE_CAPS from meta ematch 2011-07-14 14:45:59 -07:00
em_nbyte.c net_sched: cleanups 2011-01-19 23:31:12 -08:00
em_text.c net_sched: cleanups 2011-01-19 23:31:12 -08:00
em_u32.c net_sched: cleanups 2011-01-19 23:31:12 -08:00
ematch.c net_sched: cleanups 2011-01-19 23:31:12 -08:00
Kconfig networking: NET_CLS_ROUTE4 depends on INET 2011-05-19 19:23:28 -04:00
Makefile pkt_sched: QFQ - quick fair queue scheduler 2011-04-04 11:10:24 -07:00
sch_api.c net_sched: qdisc_alloc_handle() can be too slow 2012-01-03 13:03:20 -05:00
sch_atm.c net: remove interrupt.h inclusion from netdevice.h 2011-06-06 22:55:11 -07:00
sch_blackhole.c pkt_sched: Add qdisc->ops->peek() implementation. 2008-10-31 00:45:55 -07:00
sch_cbq.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2011-01-24 14:09:35 -08:00
sch_choke.c sch_red: generalize accurate MAX_P support to RED/GRED/CHOKE 2011-12-09 13:46:15 -05:00
sch_drr.c net_sched: accurate bytes/packets stats/rates 2011-01-20 23:31:33 -08:00
sch_dsmark.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2011-01-24 14:09:35 -08:00
sch_fifo.c net_sched: reduce fifo qdisc size 2011-03-03 11:10:02 -08:00
sch_generic.c net: Add queue state xoff flag for stack 2011-11-29 12:46:19 -05:00
sch_gred.c sch_gred: prefer GFP_KERNEL allocations 2011-12-16 15:40:33 -05:00
sch_hfsc.c sch_hfsc: report backlog information 2011-12-23 16:51:18 -05:00
sch_htb.c Fix common misspellings 2011-03-31 11:26:23 -03:00
sch_ingress.c net_sched: factorize qdisc stats handling 2011-01-10 16:07:54 -08:00
sch_mq.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
sch_mqprio.c mqprio: Avoid panic if no options are provided 2011-12-22 22:34:56 -05:00
sch_multiq.c net: Add queue state xoff flag for stack 2011-11-29 12:46:19 -05:00
sch_netem.c netem: fix classful handling 2011-12-30 17:12:23 -05:00
sch_prio.c net_sched: prio: use qdisc_dequeue_peeked 2011-08-09 21:52:11 -07:00
sch_qfq.c sch_qfq: accurate wsum handling 2012-01-03 13:02:19 -05:00
sch_red.c sch_red: generalize accurate MAX_P support to RED/GRED/CHOKE 2011-12-09 13:46:15 -05:00
sch_sfb.c sch_sfb: use skb_flow_dissect() 2011-11-28 19:09:28 -05:00
sch_sfq.c sch_sfq: dont put new flow at the end of flows 2012-01-03 12:52:09 -05:00
sch_tbf.c sch_tbf: report backlog information 2011-12-29 15:07:21 -05:00
sch_teql.c net: Rename dst_get_neighbour{, _raw} to dst_get_neighbour_noref{, _raw}. 2011-12-05 15:20:19 -05:00