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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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>>
>>