[ovs-discuss] HIgh CPU usage for ovs-vswitchd with flows 3069 and lost: 267425491

[Justin Pettit]

I'm guessing the traffic is bursty or ovs-vswitchd was busing doing other work and the queues overflowed.

--Justin


On May 27, 2013, at 9:34 AM, kevin parker <kevin.parker092 at gmail.com> wrote:

> Justin,
>          Even at 85-90% CPU usage i am seeing increased lost count,initially i faced high lost count when ovs-vswitchd was at 100%.So what can be the reason for dropped packet even with 10% free cpu available.
> 
> regards,
> kevin
> 
> 
> On Mon, May 27, 2013 at 9:40 PM, Justin Pettit <jpettit at nicira.com> wrote:
> 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
> 
> 
> 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
> >
> >
> >
> >
> > _______________________________________________
> > discuss mailing list
> > discuss at openvswitch.org
> > http://openvswitch.org/mailman/listinfo/discuss
> 
>