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Date: Thu, 27 Mar 2008 22:05:56 +0300 From: "Denis V. Lunev" <den@...allels.com> To: Eric Dumazet <dada1@...mosbay.com> Cc: Denys Fedoryshchenko <denys@...p.net.lb>, David Miller <davem@...emloft.net>, kaber@...sh.net, netdev@...r.kernel.org, netfilter-devel@...r.kernel.org Subject: Re: kernel 2.6.25-rc7 highly unstable on high load On Thu, 2008-03-27 at 19:56 +0100, Eric Dumazet wrote: > Denys Fedoryshchenko a écrit : > > Here is output from dmesg with patch you supplied. > > > > Kup /config # rtstat -i60 -c60 > > rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache| > > rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache| > > rt_cache| > > entries| in_hit|in_slow_|in_slow_|in_no_ro| in_brd|in_marti|in_marti| > > out_hit|out_slow|out_slow|gc_total|gc_ignor|gc_goal_|gc_dst_o|in_hlist| > > out_hlis| > > | | tot| mc| ute| | an_dst| > > an_src| | _tot| _mc| | ed| miss| verflow| > > _search|t_search| > > 103266| 69986| 11574| 0| 54| 0| 0| 0| > > 1982| 634| 0| 10984| 10980| 0| 0| 191808| 5254| > > 124787| 45125| 6019| 0| 28| 0| 0| 0| > > 807| 230| 0| 6277| 6274| 0| 0| 128922| 2518| > > 120270| 45588| 6288| 0| 30| 0| 0| 0| > > 883| 214| 0| 6532| 6529| 0| 0| 125651| 2743| > > 122253| 46522| 6582| 0| 27| 0| 0| 0| > > 897| 213| 0| 6822| 6819| 0| 0| 124927| 2761| > > > > [ 102.534363] dst_total: 120397 delayed: 12 work_perf: 0 expires: 27999 > > elapsed: 1 us > > [ 130.530240] dst_total: 124277 delayed: 12 work_perf: 0 expires: 32998 > > elapsed: 2 us > > [ 163.523240] dst_total: 110006 delayed: 12 work_perf: 0 expires: 39000 > > elapsed: 1 us > > [ 202.519402] dst_total: 130453 delayed: 12 work_perf: 0 expires: 45998 > > elapsed: 1 us > > [ 248.511220] dst_total: 110637 delayed: 12 work_perf: 0 expires: 52600 > > elapsed: 2 us > > [ 301.102445] dst_total: 129366 delayed: 12 work_perf: 0 expires: 60696 > > elapsed: 6 us > > > > After while > > > > Kup /config # rtstat -i300 -c60 > > rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache| > > rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache| > > rt_cache| > > entries| in_hit|in_slow_|in_slow_|in_no_ro| in_brd|in_marti|in_marti| > > out_hit|out_slow|out_slow|gc_total|gc_ignor|gc_goal_|gc_dst_o|in_hlist| > > out_hlis| > > | | tot| mc| ute| | an_dst| > > an_src| | _tot| _mc| | ed| miss| verflow| > > _search|t_search| > > 129138| 64166| 9864| 0| 46| 0| 0| 0| > > 1334| 358| 0| 10012| 10008| 0| 0| 173006| 3985| > > 130125| 43971| 10829| 0| 70| 0| 0| 0| > > 907| 195| 0| 11093| 11090| 0| 0| 100601| 2848| > > 144857| 32041| 22233| 0| 234| 0| 0| 0| > > 738| 261| 0| 22727| 22724| 2| 0| 42769| 811| > > > > [ 687.740779] dst_total: 129365 delayed: 12 work_perf: 0 expires: 104999 > > elapsed: 1 us > > [ 792.736043] dst_total: 127247 delayed: 101589 work_perf: 0 expires: 600 > > elapsed: 11274 us > > [ 793.347127] dst_total: 122440 delayed: 101589 work_perf: 0 expires: 1600 > > elapsed: 11150 us > > [ 794.957419] dst_total: 123780 delayed: 101589 work_perf: 0 expires: 3100 > > elapsed: 10896 us > > [ 798.068614] dst_total: 121992 delayed: 101589 work_perf: 0 expires: 5655 > > elapsed: 11561 us > > [ 803.734450] dst_total: 120552 delayed: 101589 work_perf: 0 expires: 7988 > > elapsed: 12254 us > > [ 811.733227] dst_total: 121105 delayed: 101589 work_perf: 0 expires: 10988 > > elapsed: 12209 us > > [ 822.733196] dst_total: 120142 delayed: 101589 work_perf: 0 expires: 13987 > > elapsed: 12039 us > > [ 836.730637] dst_total: 120823 delayed: 101589 work_perf: 0 expires: 17987 > > elapsed: 12448 us > > [ 854.726913] dst_total: 127478 delayed: 101589 work_perf: 0 expires: 22988 > > elapsed: 11435 us > > [ 877.724827] dst_total: 127497 delayed: 101589 work_perf: 0 expires: 27987 > > elapsed: 12833 us > > [ 905.719818] dst_total: 126693 delayed: 101589 work_perf: 0 expires: 32987 > > elapsed: 12068 us > > [ 938.714595] dst_total: 130740 delayed: 101589 work_perf: 0 expires: 38988 > > elapsed: 11970 us > > [ 977.707568] dst_total: 135449 delayed: 101589 work_perf: 0 expires: 45989 > > elapsed: 11747 us > > [ 1023.701554] dst_total: 141181 delayed: 101589 work_perf: 0 expires: 52988 > > elapsed: 12653 us > > [ 1076.694012] dst_total: 147895 delayed: 101588 work_perf: 1 expires: 59987 > > elapsed: 12217 us > > [ 1136.684805] dst_total: 154798 delayed: 101588 work_perf: 0 expires: 67987 > > elapsed: 12026 us > > [ 1204.673424] dst_total: 163376 delayed: 101588 work_perf: 0 expires: 76988 > > elapsed: 11151 us > > > > and after 30 minutes more > > > > Kup /config # rtstat -i300 -c60 > > rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache| > > rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache|rt_cache| > > rt_cache| > > entries| in_hit|in_slow_|in_slow_|in_no_ro| in_brd|in_marti|in_marti| > > out_hit|out_slow|out_slow|gc_total|gc_ignor|gc_goal_|gc_dst_o|in_hlist| > > out_hlis| > > | | tot| mc| ute| | an_dst| > > an_src| | _tot| _mc| | ed| miss| verflow| > > _search|t_search| > > 194841| 176962| 77964| 0| 684| 1| 0| 0| > > 3939| 1143| 0| 79531| 79516| 7| 0| 401258| 9455| > > 223224| 28262| 26499| 0| 236| 0| 0| 0| > > 661| 216| 0| 26951| 26947| 3| 0| 93059| 1946| > > 248425| 28257| 26784| 0| 226| 0| 0| 0| > > 678| 202| 0| 27211| 27208| 3| 0| 115593| 2412| > > 272823| 28943| 26728| 0| 246| 0| 0| 0| > > 695| 200| 0| 27174| 27171| 3| 0| 135256| 2942| > > 295087| 28835| 26701| 0| 252| 0| 0| 0| > > 687| 194| 0| 27146| 27143| 3| 0| 154269| 3312| > > > > > > [ 2043.547879] dst_total: 242922 delayed: 101588 work_perf: 0 expires: 119987 > > elapsed: 12519 us > > [ 2163.529997] dst_total: 252951 delayed: 101588 work_perf: 0 expires: 119987 > > elapsed: 13930 us > > [ 2283.512215] dst_total: 262678 delayed: 101588 work_perf: 0 expires: 119986 > > elapsed: 14330 us > > [ 2403.508447] dst_total: 271930 delayed: 101588 work_perf: 0 expires: 119972 > > elapsed: 15230 us > > [ 2523.476844] dst_total: 288046 delayed: 101588 work_perf: 0 expires: 119985 > > elapsed: 15018 us > > [ 2643.456996] dst_total: 296475 delayed: 101588 work_perf: 0 expires: 119987 > > elapsed: 13654 us > > [ 2763.438267] dst_total: 305033 delayed: 101588 work_perf: 0 expires: 119987 > > elapsed: 13137 us > > > > > > Very interesting... you can see 101588 dst are *delayed* in dst_garbage, > but apparently never freed. > > Something is wrong, but the count seems stable. Must be some kind of > event, admin driven or something... > might be the "ip route flush cache" that is schedlued around 600 seconds > of machine alive, then secret_interval seconds later... > > Typically, when a "ip route flush cache" is done (manually or triggered > by secret_interval timer), refcounted>0 entries are put into dst_garbage. > > Then when some trafic occurs on the flows involved, IP stack should > decrement refcount so that next dst_garbage round can free the deleted > entries. Normal TCP connections are doing this correctly. On your > machine, nothing. > > Possibly idle tcp sessions ? > > Maybe some netfilter problem ? > > Please tell us more about your machine ;) could you check the patch sent yesterday by Pavel under the name [PATCH][ICMP]: Dst entry leak in icmp_send host re-lookup code (v2). It can fit the case, massive DST leakage is possible here. Regards, Den -- 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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