Date: Tue, 25 Aug 2015 17:07:51 +0300 From: Evgeny Khorokhorin <john@maxnet.ru> To: freebsd-net@freebsd.org Subject: FreeBSD 10.2 , ospf vs. aggregated static routes, performance issue Message-ID: <55DC76B7.9060606@maxnet.ru>
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Hi, I have 10.2-STABLE, 2 CPU Intel E5-2643v3, network Intel XL710 with 1.4.0 driver from Intel I know that going through routing table is very fast (rn_match). But I decided to optimize routing table. I'm using 2 interfaces - ixl0 and ixl1. Behind ixl0 I have 304 networks 172.16.. from /28 to /24 all via the same gw 1.1.1.1 (because ip on ixl0 with /30 mask). And behind ixl1 I have default route via 2.2.2.2. That 304 172.16 networks I receive via OSPF (quagga). Now all is OK - on every interface I have up to 500kpps/395kpps, 4.5Gbps/1.57Gbps (rx/tx on ixl1 and tx/rx on ixl0). If I disable OSPF and in zebra add static route 172.16.0.0/12 via 1.1.1.1, the system works good until traffic grow up to 251kpps/181kpps , 2.27Gbps/637Mbps. After that the system is degrading: ixl's queue threads utilizes 100% CPU and I see many many traffic drops (netstat -i) If I turn on ospfd and receive 304 more specific routes the problem disappears. Where is the problem? Or I have misunderstanding about how FreeBSD uses routing table.. P.S. I use this machine as NAT. I checked this on ipfw and pf, all the same. -- Cheers, Evgeny
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