In fact, it depends on which fields are used in the match for HP switches:
http://h20628.www2.hp.com/km-ext/kmcsdirect/emr_na-c03991489-1.pdf
For ex. in HP 3500 yl MACs handled by software level, but IP address for IP
Eth type (0x800) -- in hardware. As a consequence -- switching form MAC to
IP matching can increase the throughput for such OF switches.
2017-07-13 8:56 GMT+03:00 Chaitanya Kumar <chaitanya12...@iiitd.ac.in>:
> Hi
>
> We are working on a research project that involves HP OpenFlow enabled
> switch (HP 3500 yl). We are facing some issues with performance
> particularly when operating the switch in "OpenFlow" mode. The switch is
> controlled via a desktop running the Ryu controller.
>
> The rules on the switch match packets based on the fields supported by
> OpenFlow. Further, the switch also modifies a certain IP header field (in
> this case the ToS bits) for packets that match the rules and are hence
> forwarded.
>
> More precisely, the rules match the ToS bits of the packet and change them
> to a different value before forwarding them to a chosen host.
>
> However, in the process, the forwarded packets achieve a throughput of no
> more than 700kbps, while the source and destination hosts have 100 Mbit/s
> Ethernet ports. If we disable "OpenFlow" mode and use it as it is then we
> achieve a full throughput of 100Mbit/s (the Ethernet link speeds of the
> client and server hosts). The end-to-end throughput was measured using
> *iperf*.
>
> Could someone shed some light on the reason for this drastic performance
> degradation? (all the switch does is match packets whose ToS value is
> (say,) 0x28 and replaces it with 0x40 before forwarding them to the right
> destination)
>
> Also, is there an alternative switch that someone has used successfully
> for similar things?
>
>
> A figure showing our experiment scenario is given below, for reference.
>
>
>
>
> Thanks,
>
> Chaitanya
>
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