RE: [Xen-API] Flood test with xen/openvswitch

[Rob Hoes <Rob.Hoes@xxxxxxxxxx>]

Hi,

If you are worried that a VM overloads the network, you could try to use the 
QoS settings (on the VIF, or on the vswitch port) to limit the data rate 
through that VIF.

Cheers,
Rob

> -----Original Message-----
> From: xen-api-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-api-
> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Sébastien Riccio
> Sent: 07 September 2011 12:29
> To: xen-api@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-API] Flood test with xen/openvswitch
> 
> Hi,
> 
> I just did a test to see how openvswitch handle a flood from a virtual
> machine on a xen
> host using it as the networking layer.
> 
> I just issued a :
> 
> vm1# hping3  -S -L 0 -p 80 -i u100 192.168.1.1
> 
> options I used are:
> -S set SYN tcp flag
> -L set ACK tcp flag
> -p destination port
> -i u100 = interval between packets in micro seconds
> 
> This results in a cpu usage up to 97% by the ovs-vswitchd process in
> the
> dom0.
> Letting it go for a few minutes turns the whole xen host unresponsive
> to
> network access
> and must then be accessed from the local console.
> 
> Is that an excepted behavior ? I know the test is quite agressive but
> any customer could issue such a flood
> and render the whole host unreachable. Are there workarounds ?
> 
> Thanks for your help.
> 
> Best regards,
> Sébastien
> 
> part of the openvswitch logs when issuing the flood:
> 
> Sep 07 13:13:26|01523|poll_loop|WARN|wakeup due to [POLLIN] on fd 18
> (NETLINK_GENERIC<->NETLINK_GENERIC) at ../lib/netlink-socket.c:668 (85%
> CPU usage)
> Sep 07 13:13:26|01524|poll_loop|WARN|wakeup due to [POLLIN] on fd 21
> (NETLINK_GENERIC<->NETLINK_GENERIC) at ../lib/netlink-socket.c:668 (85%
> CPU usage)
> Sep 07 13:13:27|01525|poll_loop|WARN|Dropped 5136 log messages in last
> 1
> seconds (most recently, 1 seconds ago) due to excessive rate
> Sep 07 13:13:27|01526|poll_loop|WARN|wakeup due to [POLLIN] on fd 18
> (NETLINK_GENERIC<->NETLINK_GENERIC) at ../lib/netlink-socket.c:668 (85%
> CPU usage)
> Sep 07 13:13:27|01527|poll_loop|WARN|wakeup due to [POLLIN] on fd 21
> (NETLINK_GENERIC<->NETLINK_GENERIC) at ../lib/netlink-socket.c:668 (85%
> CPU usage)
> Sep 07 13:13:28|01528|poll_loop|WARN|Dropped 5815 log messages in last
> 1
> seconds (most recently, 1 seconds ago) due to excessive rate
> Sep 07 13:13:28|01529|poll_loop|WARN|wakeup due to [POLLIN] on fd 18
> (NETLINK_GENERIC<->NETLINK_GENERIC) at ../lib/netlink-socket.c:668 (85%
> CPU usage)
> Sep 07 13:13:28|01530|poll_loop|WARN|wakeup due to [POLLIN] on fd 21
> (NETLINK_GENERIC<->NETLINK_GENERIC) at ../lib/netlink-socket.c:668 (85%
> CPU usage)
> Sep 07 13:13:29|01531|poll_loop|WARN|Dropped 8214 log messages in last
> 1
> seconds (most recently, 1 seconds ago) due to excessive rate
> Sep 07 13:13:29|01532|poll_loop|WARN|wakeup due to [POLLIN] on fd 18
> (NETLINK_GENERIC<->NETLINK_GENERIC) at ../lib/netlink-socket.c:668 (82%
> CPU usage)
> Sep 07 13:13:29|01533|poll_loop|WARN|wakeup due to [POLLIN] on fd 21
> (NETLINK_GENERIC<->NETLINK_GENERIC) at ../lib/netlink-socket.c:668 (82%
> CPU usage)
> Sep 07 13:13:30|01534|poll_loop|WARN|Dropped 5068 log messages in last
> 1
> seconds (most recently, 1 seconds ago) due to excessive rate
> Sep 07 13:13:30|01535|poll_loop|WARN|wakeup due to [POLLIN] on fd 18
> (NETLINK_GENERIC<->NETLINK_GENERIC) at ../lib/netlink-socket.c:668 (82%
> CPU usage)
> Sep 07 13:13:30|01536|poll_loop|WARN|wakeup due to [POLLIN] on fd 21
> (NETLINK_GENERIC<->NETLINK_GENERIC) at ../lib/netlink-socket.c:668 (82%
> CPU usage)
> Sep 07 13:13:31|01537|poll_loop|WARN|Dropped 5008 log messages in last
> 1
> seconds (most recently, 1 seconds ago) due to excessive rate
> Sep 07 13:13:31|01538|poll_loop|WARN|wakeup due to [POLLIN] on fd 18
> (NETLINK_GENERIC<->NETLINK_GENERIC) at ../lib/netlink-socket.c:668 (82%
> CPU usage)
> Sep 07 13:13:31|01539|poll_loop|WARN|wakeup due to [POLLIN] on fd 21
> (NETLINK_GENERIC<->NETLINK_GENERIC) at ../lib/netlink-socket.c:668 (82%
> CPU usage)
> Sep 07 13:13:32|01540|poll_loop|WARN|Dropped 4841 log messages in last
> 1
> seconds (most recently, 1 seconds ago) due to excessive rate
> Sep 07 13:13:32|01541|poll_loop|WARN|wakeup due to 40-ms timeout at
> ../ofproto/ofproto-dpif.c:622 (83% CPU usage)
> Sep 07 13:13:32|01542|poll_loop|WARN|wakeup due to [POLLIN] on fd 18
> (NETLINK_GENERIC<->NETLINK_GENERIC) at ../lib/netlink-socket.c:668 (83%
> CPU usage)
> Sep 07 13:13:33|01543|poll_loop|WARN|Dropped 92 log messages in last 1
> seconds (most recently, 1 seconds ago) due to excessive rate
> Sep 07 13:13:33|01544|poll_loop|WARN|wakeup due to [POLLIN] on fd 18
> (NETLINK_GENERIC<->NETLINK_GENERIC) at ../lib/netlink-socket.c:668 (83%
> CPU usage)
> Sep 07 13:13:33|01545|poll_loop|WARN|wakeup due to [POLLIN] on fd 21
> (NETLINK_GENERIC<->NETLINK_GENERIC) at ../lib/netlink-socket.c:668 (83%
> CPU usage)
> Sep 07 13:13:34|01546|poll_loop|WARN|Dropped 27 log messages in last 1
> seconds (most recently, 1 seconds ago) due to excessive rate
> Sep 07 13:13:34|01547|poll_loop|WARN|wakeup due to 53-ms timeout at
> ../lib/mac-learning.c:294 (83% CPU usage)
> Sep 07 13:13:34|01548|poll_loop|WARN|wakeup due to [POLLIN] on fd 18
> (NETLINK_GENERIC<->NETLINK_GENERIC) at ../lib/netlink-socket.c:668 (83%
> CPU usage)
> 
> 
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