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[openflow-discuss] Modify packet fields extremely slow

Aaron Rosen arosen at
Sun Jun 26 12:15:48 PDT 2011

Hi Ben,

But in order to use OVS in this manor I would need a box running OVS
that everyone first sent their traffic to first right?  Is the reason
why OVS can perform a factor of 1000 faster is because the
implementation is better or because the hardware of a commodity PC is
better for this than that of the OF switch that is doing the
modifying? Just curious.



On Sun, Jun 26, 2011 at 3:00 PM, Ben Pfaff <blp at> wrote:
> On Sun, Jun 26, 2011 at 02:54:13PM -0400, Aaron Rosen wrote:
>> Thanks for your reply.  I just tested this on the same HP just
>> rewriting the DL_DST and the performance is the same there too so it
>> must be done in software completely on these switches :(
> You mentioned a "high" rate of 683 Mbit/sec.  If that's a good rate for
> you, you don't need switching ASIC for that.  Open vSwitch can handle
> several gigabits per second on commodity PC server hardware.  And its
> performance won't drop by a factor of 1000 when you start modifying
> headers.

Aaron O. Rosen
Masters Student - Network Communication
306B Fluor Daniel

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