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Date: Sat, 21 Jul 2012 00:42:46 +0200 From: Eric Dumazet <eric.dumazet@...il.com> To: David Miller <davem@...emloft.net> Cc: netdev@...r.kernel.org Subject: Re: [PATCH 00/16] Remove the ipv4 routing cache On Sat, 2012-07-21 at 00:06 +0200, Eric Dumazet wrote: > Hmm, ok, please give me few hours to make some tests ;) > It seems we have a big regression somewhere with net-next, but it is already there... (Apparently we choke on neighbour entries count. entries = atomic_inc_return(&tbl->entries) - 1; We need a percpu_counter ? Or something is wrong ? We also choke on write_lock_bh(&tbl->lock); (__write_lock_failed()) in __neigh_create() current 'linux' tree : tbench 24 -t 60 Operation Count AvgLat MaxLat ---------------------------------------- NTCreateX 8433514 0.023 1.566 Close 6195255 0.023 1.450 Rename 357080 0.022 1.457 Unlink 1702925 0.023 1.409 Deltree 240 0.000 0.001 Mkdir 120 0.024 0.032 Qpathinfo 7643560 0.023 1.565 Qfileinfo 1340393 0.023 1.566 Qfsinfo 1401593 0.023 1.425 Sfileinfo 686932 0.023 0.237 Find 2955412 0.023 1.566 WriteX 4209695 0.043 1.468 ReadX 13218668 0.029 1.614 LockX 27458 0.024 0.059 UnlockX 27458 0.024 0.056 Flush 591126 0.023 0.317 Throughput 4418.83 MB/sec 24 clients 24 procs max_latency=2.433 ms net-next tree with your 16 patches : Operation Count AvgLat MaxLat ---------------------------------------- NTCreateX 6545220 0.031 14.433 Close 4808070 0.031 14.105 Rename 277171 0.030 0.737 Unlink 1321711 0.031 2.370 Deltree 172 0.000 0.001 Mkdir 86 0.033 0.134 Qpathinfo 5932577 0.031 11.607 Qfileinfo 1039922 0.031 6.075 Qfsinfo 1087803 0.031 12.178 Sfileinfo 533226 0.031 0.993 Find 2293696 0.031 11.059 WriteX 3264634 0.054 19.164 ReadX 10260208 0.038 11.857 LockX 21319 0.032 0.168 UnlockX 21319 0.032 0.162 Flush 458724 0.032 1.774 Throughput 3425.42 MB/sec 24 clients 24 procs max_latency=19.174 ms perf output for linux tree : Samples: 6M of event 'cycles', Event count (approx.): 4966119889380 4,18% tbench tbench [.] 0x0000000000001f49 4,09% tbench libc-2.15.so [.] 0x000000000003cb08 3,10% tbench_srv [kernel.kallsyms] [k] copy_user_generic_string 2,05% tbench_srv [kernel.kallsyms] [k] ipt_do_table 2,04% tbench [kernel.kallsyms] [k] ipt_do_table 1,48% tbench [kernel.kallsyms] [k] copy_user_generic_string 1,43% tbench_srv [kernel.kallsyms] [k] tcp_ack 1,08% tbench_srv [kernel.kallsyms] [k] tcp_recvmsg 1,06% tbench [kernel.kallsyms] [k] nf_iterate 1,00% tbench_srv [kernel.kallsyms] [k] nf_iterate 0,94% tbench_srv [nf_conntrack] [k] tcp_packet 0,94% tbench [nf_conntrack] [k] tcp_packet 0,90% tbench_srv [kernel.kallsyms] [k] __schedule 0,87% tbench [kernel.kallsyms] [k] __schedule 0,87% tbench_srv [kernel.kallsyms] [k] _raw_spin_lock_bh 0,85% tbench_srv [kernel.kallsyms] [k] tcp_sendmsg 0,80% tbench [kernel.kallsyms] [k] __switch_to 0,79% tbench [kernel.kallsyms] [k] _raw_spin_lock_bh 0,77% tbench libc-2.15.so [.] vfprintf 0,76% tbench [kernel.kallsyms] [k] tcp_sendmsg 0,74% tbench [kernel.kallsyms] [k] select_task_rq_fair 0,72% tbench_srv tbench_srv [.] 0x0000000000001840 0,70% tbench_srv libc-2.15.so [.] recv 0,65% tbench_srv [kernel.kallsyms] [k] tcp_rcv_established 0,65% tbench [kernel.kallsyms] [k] tcp_transmit_skb 0,64% tbench [vdso] [.] 0x00007fffd93459e8 0,63% tbench_srv [kernel.kallsyms] [k] tcp_transmit_skb 0,63% tbench [kernel.kallsyms] [k] tcp_recvmsg 0,55% tbench_srv [nf_conntrack] [k] nf_conntrack_in perf for net-next tree : Samples: 6M of event 'cycles', Event count (approx.): 4685309724658 3,42% tbench tbench [.] 0x00000000000035ab 3,32% tbench libc-2.15.so [.] 0x00000000000913f0 2,52% tbench_srv [kernel.kallsyms] [k] copy_user_generic_string 1,75% tbench [kernel.kallsyms] [k] ipt_do_table 1,71% tbench_srv [kernel.kallsyms] [k] ipt_do_table 1,31% tbench [kernel.kallsyms] [k] __neigh_create 1,25% tbench_srv [kernel.kallsyms] [k] __neigh_create 1,23% tbench [kernel.kallsyms] [k] nf_iterate 1,19% tbench [kernel.kallsyms] [k] copy_user_generic_string 1,19% tbench_srv [kernel.kallsyms] [k] nf_iterate 1,02% tbench_srv [kernel.kallsyms] [k] tcp_ack 0,96% tbench_srv [kernel.kallsyms] [k] tcp_recvmsg 0,88% tbench_srv [kernel.kallsyms] [k] __write_lock_failed 0,88% tbench [kernel.kallsyms] [k] __write_lock_failed 0,82% tbench [kernel.kallsyms] [k] __schedule 0,77% tbench_srv [kernel.kallsyms] [k] tcp_sendmsg 0,76% tbench_srv [kernel.kallsyms] [k] __schedule 0,76% tbench [nf_conntrack] [k] tcp_packet 0,74% tbench_srv [nf_conntrack] [k] tcp_packet 0,74% tbench [kernel.kallsyms] [k] __switch_to 0,71% tbench_srv [kernel.kallsyms] [k] _raw_spin_lock_bh 0,68% tbench [kernel.kallsyms] [k] tcp_sendmsg 0,66% tbench [kernel.kallsyms] [k] _raw_spin_lock_bh 0,63% tbench [kernel.kallsyms] [k] ip_finish_output 0,63% tbench [kernel.kallsyms] [k] tcp_recvmsg 0,61% tbench_srv [kernel.kallsyms] [k] ip_finish_output 0,61% tbench [vdso] [.] 0x00007fffb57ff8d1 0,60% tbench_srv libc-2.15.so [.] recv 0,59% tbench [kernel.kallsyms] [k] neigh_destroy -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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