[LARTC] Looking for new ideas to improve linux router performace

From: <administrator@netwlan.net>
To: lartc@vger.kernel.org
Subject: [LARTC] Looking for new ideas to improve linux router performace
Date: Wed, 08 Nov 2006 12:39:08 +0000	[thread overview]
Message-ID: <005801c70332$e2a74690$641497c1@sysadmin> (raw)

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Hello,

I have 2 dual CPU Xeon 3Ghz HT enabled Linux routers and each one of them
serving 2 class C with pick traffic on router about 300Mbit full duplex

2 x Ethernet controller: Intel Corporation 82546GB Gigabit Ethernet
Controller (rev 03) 

1GB ram

And 

2 x Ethernet controller: Broadcom Corporation NetXtreme BCM5703 Gigabit
Ethernet (rev 10)

1GB ram

Both routers have about 600 iptables rules, 4000 tc rules with HFSC
scheduler and 300 static routes 

I have implemented tc filter hashing which improve performance 

but my goal is to push those machines to the limit with 4 class C and double
above rules and traffic

Currently system takes no more then 60% CPU time at pick per working CPU as
every NIC has been set on different CPU,

and I have two idle CPUs on each machine .

 Currently Linux kernels are coming with timer interrupt of 1000hz max which
in my opinion is not enough 

 Also there is no way to serve interrupts from one NIC on two processors.

 I'm open for suggestions 

 Thanks to all in advance.

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