Date: Wed, 27 Feb 2008 10:06:56 -0300 From: JoaoBR <joao@matik.com.br> To: freebsd-stable@freebsd.org Cc: Holger Kipp <hk@alogis.com> Subject: Re: em very slow, shared irq... on 6.3p8 Message-ID: <200802271006.56859.joao@matik.com.br> In-Reply-To: <20080227104942.GA14530@intserv.int1.b.intern> References: <20080227104942.GA14530@intserv.int1.b.intern>
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On Wednesday 27 February 2008 07:49:42 Holger Kipp wrote: > Hello, > > I updated a system with 12 dc-interfaces to a new hardware > with 14 em-interfaces. Yes, it is a firewall. > New System is 6.2-RELEASE-p8. > > What I now experience between two internal networks (100MBit/s each) > is the following: > 1318 packets transmitted, 1317 packets received, 0% packet loss > round-trip min/avg/max/stddev =3D 0.387/246.153/2441.392/324.142 ms > > tcpdump on the firewall shows similar delays (on the outgoing > interface). > > tcpdump on the system I ping however shows very quick responses > for incoming packages (ie usually less than a millisecond). > > I therefore assume that the problem is between receiving the > irq from em<x> and getting the data from the interface on the firewall > itself. > > My first option would be to activate polling on em-interfaces - but as > I did not experience this sort of notieceable slowdown with the old > dc-based firewall (without polling), maybe someone can shed some light > on this strange behaviour or has other suggestions as well? I had a setup with 4 (dlink 4port + 1 nic nfe onboard) which run extremely= =20 stable 6.3 I upgraded the hardware (S939 -> AM2) and used two em 2port cards, without= =20 polling it was certanly unusable but with polling I got very good performan= ce without polling normally in a day or less the machine hung, no msg, simply= =20 freezed with polling it stands some days up to two weeks when it freeze again I upgraded to 7.0 same result check your setup with vmstat -i and if you see two nics on the same interru= pt=20 I guess you get the same result as I got actual I am running one em 2port and two single port pci cards what seems t= o=20 be stable anyway, similare setup on Tyan MBs do not have this problem where I also ha= ve=20 8 nics on one system I also do not have this problems on S939 boards only on AM2, so I am not su= re=20 where the problem is exactly but seems in a certain way hardware related You could try changing your PS unit because you might be short on power wit= h=20 lots of em cards and SATA disks =2D-=20 Jo=E3o A mensagem foi scaneada pelo sistema de e-mail e pode ser considerada segura. Service fornecido pelo Datacenter Matik https://datacenter.matik.com.br
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