[ovs-discuss] HIgh CPU usage for ovs-vswitchd with flows

[kevin parker]

Hi Justin,
             Which version do u recommend,which is capable enough to use
low cpu:

I tested on  kvm *host1* running *OVS 1.6.90* and created vm-1  and on
another kvm *host2* created  2 vms (vm1 and vm2) then from vm2 and vm3
using hping3 i flooded vm1.

initially flow was 500 later came down to <5

sudo ovs-dpctl show

system at kvmbr0:
lookups: hit:29144 missed:71485237 lost:8866
*flows: 3*
port 0: xenbr0 (internal)
port 1: eth1

but CPU usage of ovs-vswitchd was ~100% when i increased *

flow-eviction-threshold to 2000
*
*


*

CPU usage did not decrease but total RAM usage increased by 10% .

On other vms running on *host1* there was more than 25% packet loss for
ping request and broken pipe for ssh session.


*

*

Regards,
Kevin



On Tue, May 28, 2013 at 10:46 PM, Jing Ai <ai_jing2000 at hotmail.com> wrote:

>
> > Date: Mon, 27 May 2013 09:10:20 -0700
> > From: Justin Pettit <jpettit at nicira.com>
> > Subject: Re: [ovs-discuss] HIgh CPU usage for ovs-vswitchd with flows
> > 3069 and lost: 267425491
> > To: kevin parker <kevin.parker092 at gmail.com>
> > Cc: discuss at openvswitch.org
> > Message-ID: <A4832074-0D58-4325-B208-66E3930A30F2 at nicira.com>
> > Content-Type: text/plain; charset=iso-8859-1
> >
> > We've made a lot of improvements in flow set up rate since version 1.4,
> so upgrading to a more current version (we're on 1.10 now) will likely
> help. We're currently working on multithreading the OVS userspace and
> adding support for wildcarded flows in the kernel, which should
> substantially improve flow set up.
> >
> > --Justin
> >
>
> Good to know there are ongoing efforts to improve flow setup. What are the
> timelines for those features? Any patch sent out for review? Thanks!
>
> Best,
> Jing
>
>
> >
> > On May 27, 2013, at 12:59 AM, kevin parker <kevin.parker092 at gmail.com>
> wrote:
> >
> > > Hi,
> > >
> > > Running OVS 1.4 on xenserver 6.0.2 , but its taking very high cpu some
> times ~100%.
> > >
> > > ovs-dpctl show
> > >
> > > system at xenbr5:
> > > lookups: hit:2560723 missed:3742809 lost:0
> > > flows: 5
> > > port 0: xenbr5 (internal)
> > > port 1: eth5
> > > system at xapi2:
> > > lookups: hit:1660559495 missed:1241428 lost:0
> > > flows: 11
> > > port 0: xapi2 (internal)
> > > port 1: eth7
> > > port 2: eth6
> > > system at xenbr4:
> > > lookups: hit:2539909 missed:3729876 lost:0
> > > flows: 5
> > > port 0: xenbr4 (internal)
> > > port 1: eth4
> > > system at xapi3:
> > > lookups: hit:20443295213 missed:26596588140 lost:267425491
> > > flows: 3069
> > > port 0: xapi3 (internal)
> > > port 1: eth1
> > > port 2: eth0
> > > port 4: xapi4 (internal)
> > > port 15: vif12.0
> > > port 18: vif14.0
> > > system at xenbr2:
> > > lookups: hit:1634980795 missed:166104910 lost:0
> > > flows: 127
> > > port 0: xenbr2 (internal)
> > > port 1: eth2
> > > system at xenbr3:
> > > lookups: hit:2450949145 missed:81360495 lost:0
> > > flows: 118
> > > port 0: xenbr3 (internal)
> > > port 1: eth3
> > > port 2: xapi6 (internal)
> > > port 6: vif12.1
> > > port 8: vif14.1
> > >
> > > Network usage:
> > >
> > > dstat -n
> > >
> > > -net/total-
> > > recv send
> > > 6475k 5736k
> > > 6575k 5646k
> > > 6767k 6347k
> > >
> > > Can some one please tell me how this can be fixed.
> > >
> > > Regards,
> > > Kevin
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://openvswitch.org/pipermail/ovs-discuss/attachments/20130529/9fac6364/attachment.html>