Hello All, I am using virDomainSetInterfaceParameters() API to set the network interface tune parameter for a running guest VM. I am able to set the Inbound and Outbound values successfully, but not sure how to test it. I tried scp command to copy a file from host to VM but i am not observing the desired throttling over the network. Is there any other way to test network throttling or do i missing something. Please help regards, Vikrant

On 27.05.2013 09:21, Michal Privoznik wrote: > On 27.05.2013 08:56, vikrant verma wrote: >> Hello All, >> >> I am using virDomainSetInterfaceParameters() API to set the network >> interface tune parameter for a running guest VM. >> >> I am able to set the Inbound and Outbound values successfully, but not >> sure how to test it. I tried scp command to copy a file from host to VM >> but i am not observing the desired throttling over the network. >> >> Is there any other way to test network throttling or do i missing something. >> >> Please help >> >> regards, >> Vikrant Huh, I had a prologue written here but it disappeared :) There was an error in setting the correct QoS values. There's a patch fixing it: > > commit 0ac3baee2c2fd56ef89f24f5ea484e39d2bf35f5 > Author: Eiichi Tsukata <eiichi.tsukata.xh(a)hitachi.com&gt; > AuthorDate: Fri Jun 29 15:09:16 2012 +0900 > Commit: Michal Privoznik <mprivozn(a)redhat.com&gt; > CommitDate: Fri Jun 29 10:56:13 2012 +0200 > > Fix vm's outbound traffic control problem > ... > > http://libvirt.org/git/?p=libvirt.git;a=commitdiff;h=0ac3baee2c2fd56ef89f... > > The commit is included in the 0.9.13 release. > > Michal

On 27.05.2013 10:25, vikrant verma wrote: > Hello Michal, > > Thanks for the reply. > > I am using libvirt version 1.0.2 , so how should i proceed. Do i need > this patch? > You already are using it. So I wonder what is the actual bandwidth you are using. Can you share the setting and actual bandwidth (scp is just fine - but consider copying bigger files - e.g. 700MB iso image). Michal

On 27.05.2013 12:36, vikrant verma wrote: > Hello Michal, > > I am using the following code - > > virDomainSetInterfaceParameters(dom, "vnet0", networkParainfoPtr, > nparams,0); > > before calling this i am assigning the following Inbound values > > inbound.average = 10 (10 kbps) > inbound .peak = 10 > inbound.burst = 10 I suspect this way too low burst value. Try leaving the limit and it should work correctly. Michal

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