6.x, 4.x ipfw/dummynet pf/altq - network performance issues

Freddie Cash fcash at ocis.net
Thu Feb 15 20:39:52 UTC 2007

On Thursday 15 February 2007 11:43 am, Justin Robertson wrote:
>   Playing with these sysctl values made 0 difference - what's supposed
> to happen???
>   Another scary discovery - if you've got 6.2 setup to route, even with
> static routes, 1Mbps of TCP SYN traffic will cause it to start dropping
> packets in every direction. Awesome. Methinks I'll be using 4.11 for a
> while. ;P

How are you measuring that?

We have a dual-Opteron 2 GHz box with 4 GB RAM that handles routing for 7 
fibre-connected sites (1 Gbps fibre links but limited by the firewalls at 
the sites to 100 Mbps) and connects to the Internet via a 1 Gbps link.

All the routing on this box is handled via static routes, and we get a 
sustained 10 Mbps of traffic through the box.  Nobody's complained about 
their access (which isn't surprising since we upgraded their Internet 
connections from a 2 Mbps shared cable connection to a dedicated 1 Gbps 
fibre link).

FreeBSD 6.1-p11, about 100 ipfw rules, doing NAT for 4 servers, using 2x 
bge(4) devices and 1x fxp(4) device.

Freddie Cash
fcash at ocis.net

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