Re: FBSD 1GBit router?

[Stefan Lambrev <stefan_(_dot_)_lambrev_(_at_)_moneybookers_(_dot_)_com>]

Zaphod Beeblebrox wrote:
> On Feb 5, 2008 8:00 AM, Bc. Radek Krejca <radek_(_at_)_ceskedomeny_(_dot_)_cz> wrote:
>
>
>   
> >   I have FreeBSD box as router
> >  FreeBSD pvt-gw.starnet.cz 6.1-RELEASE-p12 FreeBSD 6.1-RELEASE-p12 #2: Wed
> > Jan 31 21:28:44 CET 2007     root_(_at_)_pvt-gw_(_dot_)_starnet_(_dot_)_cz:/usr/obj/usr/src/sys/DL360-G4
> >  i386
> >  But speed is only about 382 Mbit. I have following values in
> >  sysctl.conf:
> >
> > net.inet.ip.fastforwarding=1
> > net.inet.tcp.recvspace=262144
> > net.inet.tcp.sendspace=262144
> > kern.ipc.maxsockbuf=33554432
> >
> >     
>
> The ip.fastforwarding makes a tiny insignificant difference with the caveat
> that your box won't show up on traceroutes.  Fast forwarding is "fast" by
> virtue of the fact that it doesn't decrement TTL.
>
> The other sysctl values effect traffic originating or termating at your
> router --- they probably have no effect on performance.
>
>
>   
> >   I need about 600-700 Mbit. Is any chance on freebsd? Hardware is HP
> >  DL360-G4, interrupt takes about 55 % of CPU. I tested it over
> >  netperf and result is about 382 Mbit.
> >     
>
>
> If you need large packet performance of 600-700 mbit  (large  in this case
> being packets (on average) of 1000 bytes or more), then this hardware is
> likely doable.  I'd do the following:
>
> - upgrade at least to 6.3.  upgrading to 7.0 might also be better, depending
> on hardware choices
> - ensure your ethernet cards are on fast enough busses.  'em' (Intel Ether
> Express 1000) flavor ports are my personal favorite
> - enable polling (this will make a _huge_ difference by itself)
>   
Let me disagree with this - while polling reduce CPU utilization it 
doesn't perform better.
When the network is under pressure polling can lead to lost packets.
After all one should test how polling works for him, but with polling 
enabled my intel network cards
does not work better.
> - your hardware is (likely) dual core.  Make sure every piece of hardware in
> use doesn't involve any giant locks.  Under 6.x consider the mpsafenet
> sysctl.  This is also a point on which 7.0 will shine.
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>   

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