Netmap support for Virtual network driver

[Thirunavukarasu Sengalvarayan -X (tsengalv - HCL TECHNOLOGIES LIMITED at Cisco)]

(Continuing with below mail thread.)

Hi Luigi,

Thanks a lot for your quick response.
Yes we have the source base for hyper-v network driver.
Could you please provide us the patch for Netmap support in Hyper-v Network drivers.
Hyper-v has two kinds of NIC, emulated and Synthetic.
In general emulated network drivers are relatively slow when compared to Synthetic network drivers.
Hence we planned to use synthetic network drivers(netvsc).
You have pointed that we could use e1000 emulation as another option.
Which driver would be better in terms of performance, Netmap with emulation driver or Netmap with synthetic driver?

Thanks
Thiru.

---------- Forwarded message ----------
From: Luigi Rizzo <rizzo at iet.unipi.it<mailto:rizzo at iet.unipi.it>>
Date: Fri, Dec 13, 2013 at 12:54 AM
Subject: Re: Netmap support for Virtual network driver
To: Thirunavukarasu S <gs.thiru1983 at gmail.com<mailto:gs.thiru1983 at gmail.com>>
Cc: "freebsd-net at freebsd.org<mailto:freebsd-net at freebsd.org>" <net at freebsd.org<mailto:net at freebsd.org>>



On Thu, Dec 12, 2013 at 7:02 PM, Thirunavukarasu S <gs.thiru1983 at gmail.com<mailto:gs.thiru1983 at gmail.com>> wrote:
Hi

I am running a Virtual Linux machine on Hyper-v Microsoft Hypervisor.

I am using netvsc drivers provided by Microsoft for virtual interfaces.

Now I would like to add Netmap support for netvsc driver, after coming to
know about its wide advantages.

Does Netmap support for Microsoft Hyper-v Network drivers is already in
place.

or could you help in integrating netmap support in our netvsc drivers.

we can definitely help with the integration
as long as you have the hyperv
drivers for the guest in source format

another option might be to use the e1000 emulation
in hyperv.

but in any case don't hold your breath for performance,
because chances are that the network I/O path in the
hypervisor (hyperv in this case) is not able to
sustain the data rates that netmap can generate.

See the paper at this link to see what we did for QEMU/KVM

http://info.iet.unipi.it/~luigi/papers/20130903-rizzo-ancs.pdf


to make it run at netmap speeds

cheers
luigi


Thanks
Thiru.
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