Fwd: Netmap for routers (em0 device)
archycho at gmail.com
Fri Nov 4 19:49:43 UTC 2011
---------- Forwarded message ----------
From: Archy Cho <archycho at gmail.com>
Subject: Re: Netmap for routers (em0 device)
To: Vlad Galu <dudu at dudu.ro>
Do you know about time line for this ? Thanks.
2011/11/5 Vlad Galu <dudu at dudu.ro>
> On Nov 4, 2011, at 4:06 PM, Archy Cho wrote:
> > Hello
> > I am very happy to see freebsd could have such network performance with
> > netmap ,
> > since I am currently using freebsd as core routers instead of cisco.
> > I tried to re-compile the freebsd 8.2 kernel to test ,
> > however , I could not complete the task ( both i386 and amd64 ),
> > I could only success at 9.0-RC-1.
> > Here is my task and error message,
> > cp /usr/src/sys/i386/conf/GENERIC /usr/src/sys/i386/conf/Netmap-Router
> > echo "device netmap" >> /usr/src/sys/i386/conf/Netmap-Router
> > cd /tmp/netmap/sys/
> > cp -R * /usr/src/sys/
> > cd /usr/src/
> > patch -p < /tmp/netmap/head-netmap.diff
> > echo "WITHOUT_MODULES = bge re igb" >> /etc/make.conf
> > make buildkernel KERNCONF=Netmap-Router
> > make installkernel KERNCONF=Netmap-Router
> > -Werror ../../../dev/e1000/if_em.c -I../../../dev/e1000
> > ../../../dev/e1000/if_em.c: In function 'em_setup_receive_ring':
> > ../../../dev/e1000/if_em.c:4012: error: 'j' undeclared (first use in this
> > function)
> > ../../../dev/e1000/if_em.c:4012: error: (Each undeclared identifier is
> > reported only once
> > ../../../dev/e1000/if_em.c:4012: error: for each function it appears in.)
> > *** Error code 1
> > Stop in /usr/src/sys/i386/compile/Netmap-Router
> > Any hint of error message ?
> It's fairly easy to remove the offending code, AFAIK there were a few
> unused variable and signed vs unsigned comparisons.
> > More questions ,
> > I seldom facing DDOS , whatever using polling or not ,
> > 1Gbps link with 64bytes packet will cause CPU 100% ,
> > if a freebsd box compile with netmap ,
> > could it have performance boost of routed / ipfw / pf ?
> Not yet. In order to do that, ipfw or pf need to be ported to userspace. I
> believe that was on Luigi's agenda, though.
> Good, fast & cheap: pick any two.
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