Chris,
The sFlow standard indicates unknown values as follows:
The following values should be used for fields that are
unknown (unless otherwise indicated in the structure
definitions).
- Unknown integer value. Use a value of 0 to indicate that
a value is unknown.
- Unknown counter. Use the maximum counter value to indicate
that the counter is not available. Within any given sFlow
session a particular counter must be always available, or
always unavailable. An available counter may temporarily
have the max value just before it rolls to zero. This is
permitted.
- Unknown string. Use the zero length empty string.
See http://sflow.org/sflow_version_5.txt, page 34.
The Open vSwitch exports the interface counters that are maintained by the
Linux kernel (see /proc/net/dev). The ifInBroadcastPkts, ifInUnknownProtos,
ifOutMulticastPkts, ifOutBroadcastPkts counters aren't available and are marked
as unknown in the sFlow counter structure.
Peter
On Apr 24, 2012, at 6:29 AM, Christoffer Loeffler wrote:
> Hello,
>
> I ran in a curious measurement when I looked at sFlowTool and sFlowTrend
> numbers.
>
> Several counters display 4,294,967,295. These are ifInBroadcastPkts,
> ifInUnknownProtos, ifOutMulticastPkts, ifOutBroadcastPkts.
>
> My setup uses the software at [1] and I start it with [2]. For enabling
> multicasting I run the following command [0] in each lxc-shell
> [0] route add -net 224.0.0.0 netmask 240.0.0.0 dev eth0
>
> Is there a possible workaround I can use to reset the sFlow database
> entries to numbers which are more useable? Looks like this uint(?) was set
> to -1..
>
> Chris
>
>
> [1]Installed Software:
> openvswitch-1.4.0, sflowtool-3.25, Ubuntu 11.10 Kernel 3.0.0-12 in
> VirtualBox, connecting lxc-containers via brctl compatiblity mode.
>
> [2]Reproduce via:
>
> cd ~/openvswitch-1.4.0 && sudo -s
> rmmod bridge
> insmod ./datapath/linux/openvswitch_mod.ko
> insmod ./datapath/linux/brcompat_mod.ko
> ovsdb-tool create /usr/local/etc/openvswitch/conf.db
> vswitchd/vswitch.ovsschema
> ovsdb-server --remote=punix:/usr/local/var/run/openvswitch/db.sock
> --remote=db:Open_vSwitch,manager_options --pidfile --detach
> ovs-vsctl --no-wait init
> ovs-vswitchd --pidfile --detach
> ovs-brcompatd --pidfile --detach
> brctl addbr br0
> ovs-vsctl -- --id=@s create sFlow agent=lo target=\"127.0.0.1:6343\"
> header=128 sampling=64 polling=1 -- set Bridge br0 sflow=@s
>
> lxc.conf:
>> lxc.utsname = one
>> lxc.network.type = veth
>> lxc.network.flags = up
>> lxc.network.link = br0
>> lxc.network.ipv4 = 10.0.0.1/24
>
> mkdir /cgroup
> mount -t cgroup cgroup /cgroup
> lxc-create -n one -f lxc.conf
> lxc-start -n /bin/bash
>
> sflowtool
>
> _______________________________________________
> discuss mailing list
> discuss@openvswitch.org
> http://openvswitch.org/mailman/listinfo/discuss
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