[Openstack] Poor instance network performance

Satish Patel satish.txt at gmail.com
Thu Dec 17 16:32:04 UTC 2015


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 <vahric at 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.txt at 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 <vahric at 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.txt at 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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