On host (compute) machine tap device showing lots of TX packet loss.
tapdd55b834-f8: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet6 fe80::fc16:3eff:fecd:2aa4 prefixlen 64 scopeid 0x20<link>
ether fe:16:3e:cd:2a:a4 txqueuelen 500 (Ethernet)
RX packets 1060731031 bytes 298573599135 (278.0 GiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 503372157 bytes 81345389820 (75.7 GiB)
TX errors 0 dropped 171333348 overruns 0 carrier 0 collisions 0
On Thu, Dec 17, 2015 at 11:45 AM, Satish Patel <satish....@gmail.com> wrote:
> I just ran iperf and here is the results, bi-directional
>
> [ ID] Interval Transfer Bandwidth
> [ 5] 0.0-10.0 sec 1.04 GBytes 895 Mbits/sec
> [ 4] 0.0-10.0 sec 1.09 GBytes 935 Mbits/sec
>
> Look like when guest is under load, it can't handle traffic and start
> dropping packets.
>
>
>
> On Thu, Dec 17, 2015 at 11:36 AM, Vahric Muhtaryan <vah...@doruk.net.tr>
> wrote:
>> Maybe this also could be reference
>>
>> http://42.62.73.30/wordpress/wp-content/uploads/2013/10/Neutron-performance
>> -testing.pdf
>>
>>
>> On 17/12/15 18:32, "Satish Patel" <satish....@gmail.com> wrote:
>>
>>>We have our own custom application running on guest VM. i am just
>>>checking performance of VM. but i found if load go little up machine
>>>start breaking ping.
>>>
>>>I didn't run iperf test yet. which i am going to run in a min.
>>>
>>>On Thu, Dec 17, 2015 at 11:28 AM, Vahric Muhtaryan <vah...@doruk.net.tr>
>>>wrote:
>>>> Okay Satish ,
>>>>
>>>> Im not expert and do not want to divert you wrong direction.
>>>> I want to make your test on my server to cross check , can you pls
>>>>explain
>>>> how and with what tool and to where you are making this test.
>>>>
>>>> Regards
>>>> VM
>>>>
>>>> On 17/12/15 18:11, "Satish Patel" <satish....@gmail.com> wrote:
>>>>
>>>>>Thanks for reply,
>>>>>
>>>>>Following is my guest xml file.
>>>>>
>>>>>I am using Openstack JUNO and it use OVS.
>>>>>
>>>>><interface type='bridge'>
>>>>> <mac address='fa:16:3e:cd:2a:a4'/>
>>>>> <source bridge='qbrdd55b834-f8'/>
>>>>> <target dev='tapdd55b834-f8'/>
>>>>> <model type='virtio'/>
>>>>> <alias name='net0'/>
>>>>> <address type='pci' domain='0x0000' bus='0x00' slot='0x03'
>>>>>function='0x0'/>
>>>>> </interface>
>>>>>
>>>>>
>>>>>Following is TOP command on guest machine, at this point i am getting
>>>>>ping breaks
>>>>>
>>>>>top - 16:10:30 up 20:46, 1 user, load average: 4.63, 4.41, 3.60
>>>>>Tasks: 165 total, 6 running, 159 sleeping, 0 stopped, 0 zombie
>>>>>%Cpu0 : 15.1 us, 12.3 sy, 0.0 ni, 60.9 id, 0.0 wa, 0.0 hi, 0.3 si,
>>>>>11.4 st
>>>>>%Cpu1 : 22.9 us, 17.2 sy, 0.0 ni, 51.4 id, 0.0 wa, 0.0 hi, 0.3 si,
>>>>>8.2 st
>>>>>%Cpu2 : 28.8 us, 22.4 sy, 0.0 ni, 47.5 id, 0.0 wa, 0.0 hi, 1.0 si,
>>>>>0.3 st
>>>>>%Cpu3 : 16.6 us, 15.0 sy, 0.0 ni, 66.4 id, 0.0 wa, 0.0 hi, 0.3 si,
>>>>>1.7 st
>>>>>%Cpu4 : 9.8 us, 11.8 sy, 0.0 ni, 0.0 id, 75.4 wa, 0.0 hi, 0.3 si,
>>>>>2.6 st
>>>>>%Cpu5 : 7.6 us, 6.1 sy, 0.0 ni, 81.4 id, 0.0 wa, 0.0 hi, 4.2 si,
>>>>>0.8 st
>>>>>%Cpu6 : 8.1 us, 7.4 sy, 0.0 ni, 83.0 id, 0.0 wa, 0.0 hi, 1.4 si,
>>>>>0.0 st
>>>>>%Cpu7 : 17.8 us, 17.8 sy, 0.0 ni, 64.1 id, 0.0 wa, 0.0 hi, 0.3 si,
>>>>>0.0 st
>>>>>KiB Mem : 8175332 total, 4630124 free, 653284 used, 2891924
>>>>>buff/cache
>>>>>KiB Swap: 0 total, 0 free, 0 used. 7131540 avail
>>>>>Mem
>>>>>
>>>>>
>>>>>On Thu, Dec 17, 2015 at 11:06 AM, Vahric Muhtaryan <vah...@doruk.net.tr>
>>>>>wrote:
>>>>>> Hello ,
>>>>>>
>>>>>> Cool ! Todays I am testing to but not such way just only KVM.
>>>>>>
>>>>>> Wonder 2/3 things ;
>>>>>>
>>>>>> 1) Are you using virtio?
>>>>>> <model type='virtio¹/>
>>>>>>
>>>>>>
>>>>>> 2) is your vm saturating %100 of cpu inside guest ?
>>>>>>
>>>>>> 3) Using OVS or bridge ?
>>>>>>
>>>>>> Regards
>>>>>> Vahric Muhtaryan
>>>>>>
>>>>>> On 17/12/15 17:41, "Satish Patel" <satish....@gmail.com> wrote:
>>>>>>
>>>>>>>I am doing some testing on Openstack VM network performance. following
>>>>>>>i am doing
>>>>>>>
>>>>>>>Comute node: 8 CPU / 32GB mem
>>>>>>>VM instance: 8vCPU / 8GB mem
>>>>>>>
>>>>>>>when i am running heavy load application, immediate my ping started
>>>>>>>breaking for VM.. but at same time if i ping Compute Host, its working
>>>>>>>fine without any packet loss.
>>>>>>>
>>>>>>>I have disabled GSO/TSO setting on eth0 but still same result. i have
>>>>>>>notice when it reach 250mbps my ping start breaking...
>>>>>>>
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>>>>>>
>>>>>>
>>>>
>>>>
>>
>>
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