[libvirt-users] Fwd: Does Set Block IO tune take effect in the same session.

[vikrant verma]

Hi Michal,

Thanks for the analysis, please find the interface details of the dumpxml
$dom

  <interface type='network'>
      <mac address='52:54:00:4f:8d:cd'/>
      <source network='default'/>
      <target dev='vnet0'/>
      <bandwidth>
        <inbound average='10'/>
      </bandwidth>
      <alias name='net0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03'
function='0x0'/>
    </interface>

Regards,
Vikrant



On Fri, May 31, 2013 at 2:58 PM, Michal Privoznik <mprivozn at redhat.com>wrote:

> On 31.05.2013 07:05, vikrant verma wrote:
> > Hello Michal,
> >
> > Throttling is working now after setting inbound.average = 10  (i have
> > set other values to 0 )
> > But i am observing an inconsistent behavior in the observed throttling
> > bandwidth
> >
> > when i set  inbound.average = 10 , i observed bandwidth of 24 kbps
> > when i set  inbound.average = 100 , i observed bandwidth of 186 kbps
> > when i set  inbound.average = 1024 , i observed bandwidth of 2MBps
> >
> > i measured the above by doing scp of a 4MB file from host to VM. Is this
> > behavior is expected?
> >
>
> I don't think so. So your other values are set to 0? Can you share the
> actual <bandwidth/> element from 'virsh dumxpl $dom'?
>
> However, I might be hitting the same issue:
>
> # tc -s class show dev vnet0
> class htb 1:1 root leaf 2: prio 0 rate 80000bit ceil 80000bit burst 1600b
> cburst 1600b
>  Sent 5146972 bytes 3540 pkt (dropped 0, overlimits 0 requeues 0)
>  rate 536752bit 45pps backlog 0b 4p requeues 0
>  lended: 359 borrowed: 0 giants: 0
>  tokens: -937499999 ctokens: -937499999
>
> class sfq 2:36c parent 2:
>  (dropped 0, overlimits 0 requeues 0)
>  backlog 103018b 4p requeues 0
>  allot 1520
>
> We can see both rate and ceil being 80kbit however the current rate being
> 536kbit. I wonder what's going on and how to fix this.
>
> > Regards,
> > Vikrant
>
> Michal
>
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