netmap: I got some troubles with netmap

[Wang Weidong]

On 2014/1/24 22:56, Vincenzo Maffione wrote:
> 
> 
> 
> 2014/1/24 Wang Weidong <wangweidong1 at huawei.com <mailto:wangweidong1 at huawei.com>>
> 
[...]
> 
> Hello,
>  
[...]
> 
> You are using the old/deprecated QEMU command line syntax (-net), and therefore honestly It's not clear to me what kind of network configuration you are running.
> 
Here, I use the default configuration which provided by the QEMU.

> Please use our scripts "launch-qemu.sh", "prep-taps.sh", according to what described in the README.images file (attached).
> Alternatively, use the syntax like in the following examples
> 
> (#1)   qemu-system-x86_64 archdisk.qcow -enable-kvm -device virtio-net-pci,netdev=mynet -netdev tap,ifname=tap01,id=mynet,script=no,downscript=no -smp 2
> (#2)   qemu-system-x86_64 archdisk.qcow -enable-kvm -device e1000,mitigation=off,mac=00:AA:BB:CC:DD:01,netdev=mynet -netdev netmap,ifname=vale0:01,id=mynet -smp 2
> 
I will use them, thanks.

> so that it's clear to us what network frontend (e.g. emulated NIC) and network backend (e.g. netmap, tap, vde, ecc..) you are using.
> In example #1 we are using virtio-net as frontend and tap as backend, while in example #2 we are using e1000 as frontend and netmap as backend.
> Also consider giving more than one core (e.g. -smp 2) to each guest, to mitigate receiver livelock problems.
>  
> 
> 
>     2. I use the vale below:
>     qemu-system-x86_64 -m 2048 -boot c -net nic -net netmap,vale0:0 -hda /home/wwd/tinycores/20131019-tinycore-netmap.hdd -enable-kvm -vnc :0
> 
> Same for here, it's not clear what you are using. I guess each guest has an e1000 device and is connected to a different port of the same vale switch (e.g. vale0:0 and vale0:1)?
> 
>     Test with 2 vms from the same host
>     vale0 without device.
>     I use the pkt-gen, the speed is 938 Kpps
> 
> 
> You should get ~4Mpps with e1000 frontend + netmap backend on a reasonably good machine. Make sure you have ./configure'd QEMU with --enable-e1000-paravirt.
>  
> 
>     I use netperf -H 10.0.0.2 -t UDP_STREAM, I got the speed is 195M/195M, then add -- -m 8, I only got 1.07M/1.07M.
>     When use the smaller msg size, the speed will smaller?
> 
> 
> If you use e1000 with netperf (without pkt-gen) your performance is doomed to be horrible. Use e1000-paravirt (as a frontend) instead if you are interested in netperf experiment.
> Also consider that the point in using the "-- -m8" options is experimenting high packet rates, so what you should measure here is not the througput in Mbps, but the packet rate: netperf reports the number of packets sent and received, so you can obtain the packet rate by dividing by the running time.
> The throughput in Mbps is uninteresting, if you want high bulk throughput you just don't use "-- -m 8", but leave the defaults.
> Using virtio-net in this case will help because of the TSO offloadings.
> 
> cheers
>   Vincenzo
>  
Hi Vincenzo,

Nice, I will retest them.

Thanks,
Wang


> 
> 
>     with vale-ctl -a vale0:eth2,
>     use pkt-gen, the speed is 928 Kpps
>     I use netperf -H 10.0.0.2 -t UDP_STREAM, I got the speed is 209M/208M, then add -- -m 8, I only got 1.06M/1.06M.
> 
>     with vale-ctl -h vale0:eth2,
>     use pkt-gen, the speed is 928 Kpps
>     I use netperf -H 10.0.0.2 -t UDP_STREAM, I got the speed is 192M/192M, then add -- -m 8, I only got 1.06M/1.06M.
> 
>     Test with 2 vms form two host,
>     I only can test it by vale-ctl -h vale0:eth2 and set eth2 into promisc
>     use pkt-gen with the default params, the speed is about 750 Kpps
>     use netperf -H 10.0.0.2 -t UDP_STREAM, I got the speed is 160M/160M
>     Is this right?
> 
> 
>     3. I can't use the l2 utils.
>     When I do the "sudo l2open -t eth0 l2recv[l2send], I got that "l2open ioctl(TUNSETIFF...): Invalid argument"
>     and "use l2open -r eth0 l2recv", wait a moment (only several seconds), I got the result:
>     TEST-RESULT: 0.901 kpps 1pkts
>     select/read=100.00 err=0
> 
>     And I can't find the l2 utils from the net? Is it implemented by your team?
> 
>     All of them is tested on vms.
> 
>     Cheers.
>     Wang
> 
> 
>     >
>     > Cheers,
>     > Giuseppe
>     >
>     > Il 17/01/2014 04:39, Wang Weidong ha scritto:
>     >> On 2014/1/16 18:24, facoltà wrote:
>     [...]
>     >>
>     >>
>     >
>     >
> 
> 
> 
> 
> 
> -- 
> Vincenzo Maffione