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Message-Id: <20080328073854.M73368@visp.net.lb> Date: Fri, 28 Mar 2008 09:38:54 +0200 From: "Denys Fedoryshchenko" <denys@...p.net.lb> To: netdev@...r.kernel.org, netfilter-devel@...r.kernel.org Subject: Re: kernel 2.6.25-rc7 highly unstable on high load Already patched and tested, it doesn't change anything. On Fri, 28 Mar 2008 06:49:53 +0100, Eric Dumazet wrote > Denys Fedoryshchenko a : > > Just to make sure 2.6.24.3 is stable and it is regression i am supplying > > output from it. > > Do you want me to submit summary to bugzilla and regression list as well? > > > > And in short, IMHO 2.6.25 have major issues on routing that have to be fixed > > before release. TRIE is crashing, and even with HASH there is leak. I am > > trying my best to bisect it, but it is major router and i cannot take much > > risk on it, so i wish i can simulate in my home mini-lab. Still i am not able > > to get even proper switch (Lebanon difficult country for IT). > > > > Kup ~ # uname -a > > Linux Kup 2.6.24.3-build-0023 #3 SMP Sat Mar 8 13:01:35 EET 2008 i686 unknown > > > > up ~ # rtstat -i60 -c6000 > > 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| > > 54750| 4430| 1128| 0| 12| 0| 0| 0| > > 263| 190| 0| 709| 708| 0| 0| 3545| 313| > > 92913| 8829| 1211| 0| 1| 0| 0| 0| > > 343| 163| 0| 1375| 1373| 0| 0| 12545| 724| > > 115323| 8232| 906| 0| 0| 0| 0| 0| > > 299| 128| 0| 1035| 1033| 0| 0| 18069| 813| > > 128985| 8650| 839| 0| 0| 0| 0| 0| > > 289| 115| 0| 954| 952| 0| 0| 22515| 845| > > 116682| 8911| 861| 0| 0| 0| 0| 0| > > 288| 117| 0| 978| 976| 0| 0| 23433| 775| > > 99969| 9164| 889| 0| 0| 0| 0| 0| > > 280| 113| 0| 1002| 1000| 0| 0| 26741| 839| > > 124602| 9395| 1012| 0| 0| 0| 0| 0| > > 271| 122| 0| 1134| 1132| 0| 0| 27381| 787| > > 110051| 10036| 824| 0| 0| 0| 0| 0| > > 279| 120| 0| 944| 942| 0| 0| 28558| 783| > > 126835| 10631| 772| 0| 0| 0| 0| 0| > > 274| 117| 0| 888| 886| 0| 0| 29451| 780| > > 111881| 10357| 762| 0| 0| 0| 0| 0| > > 275| 117| 0| 879| 877| 0| 0| 28235| 751| > > 127018| 10178| 796| 0| 0| 0| 0| 0| > > 283| 117| 0| 913| 911| 0| 0| 29480| 807| > > 112242| 9839| 814| 0| 0| 0| 0| 0| > > 293| 115| 0| 929| 927| 0| 0| 28095| 796| > > 41267| 9493| 1217| 0| 1| 0| 0| 0| > > 269| 138| 0| 811| 810| 0| 0| 18545| 548| > > 76380| 9722| 1060| 0| 1| 0| 0| 0| > > 250| 135| 0| 1195| 1193| 0| 0| 14786| 414| > > 99922| 9811| 779| 0| 0| 0| 0| 0| > > 281| 124| 0| 902| 900| 0| 0| 21853| 589| > > > > Kup ~ # rtstat -i60 -c6000 > > 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| > > > > 122053| 150955| 14888| 0| 25| 1| 0| 0| > > 4611| 2090| 0| 15820| 15789| 0| 0| 369513| 11562| > > 105226| 10215| 872| 0| 0| 0| 0| 0| > > 279| 116| 0| 988| 986| 0| 0| 30343| 799| > > 126236| 10462| 924| 0| 0| 0| 0| 0| > > 260| 120| 0| 1044| 1042| 0| 0| 31699| 782| > > 114492| 9782| 884| 0| 0| 0| 0| 0| > > 253| 120| 0| 1005| 1003| 0| 0| 29695| 722| > > > > After ip route flush cache > > Kup ~ # rtstat -i60 -c6000 > > 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| > > 9088| 202136| 19262| 0| 29| 1| 0| 0| > > 5976| 2696| 0| 20647| 20606| 0| 0| 521714| 15415| > > > > > > !!!!! > > I am not wrong, ip route flush cache doesn't work at 2.6.25-rc7. I will make > > sure about that now. > > > Maybe you are a litle bit too fast for "ip route flush cache" :) > > It used to work like that : schedule a timer to start a flush in > about 2 seconds. A flush meaning : scan the whole table and delete > all entries. > > On machines with 4 millions dst entries, this was using too much > time and eventually crashing. > > On recent kernels, each rtable entry has a special field named > rt_genid, so that "ip route flush cache" doesnt have to scan the > whole table, but only change the global genid. rtables entries will > be deleted later, when their rt_genid is found to be different than > the global genid. > > Please try the patch that was suggested yesterday, as it is probably > the cure your router needs. > > http://git2.kernel.org/?p=linux/kernel/git/davem/net- 2.6.git;a=commitdiff;h=7c0ecc4c4f8fd90988aab8a95297b9c0038b6160 > > Thank you > > -- > 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 -- Denys Fedoryshchenko Technical Manager Virtual ISP S.A.L. -- 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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