On 11/18/2015 08:28 PM, Brian Haley wrote:
On 11/18/2015 07:33 AM, kevin parrikar wrote:
i am trying Juno *without *DVR and there are around 500 sub nets in
each network
node.
Network nodes have 500+ dnsmasq process which are configured to give
ipv6,ipv4
addresses out of this some fluctuates between D and S state while
others are in
continuous S state.Probably because of too many processes in D state
with
"rtnetlink_rcv" in "wchan" its showing very high load average.
functions in stack when in D state:
[<ffffffff816360a9>] rtnetlink_rcv+0x19/0x30
[<ffffffff81653e25>] netlink_unicast+0xd5/0x1b0
[<ffffffff8165420e>] netlink_sendmsg+0x30e/0x680
[<ffffffff8160e32b>] sock_sendmsg+0x8b/0xc0
[<ffffffff8160e871>] SYSC_sendto+0x121/0x1c0
[<ffffffff8160f25e>] SyS_sendto+0xe/0x10
[<ffffffff817342dd>] system_call_fastpath+0x1a/0x1f
[<ffffffffffffffff>] 0xffffffffffffffff
but in couple of seconds it changes to S state with this in stack,all
idle
process have this in stack.
[<ffffffff811d20d9>] poll_schedule_timeout+0x49/0x70
[<ffffffff811d2ac6>] do_select+0x5b6/0x780
[<ffffffff811d2e5c>] core_sys_select+0x1cc/0x2e0
[<ffffffff811d301b>] SyS_select+0xab/0x100
[<ffffffff817342dd>] system_call_fastpath+0x1a/0x1f
[<ffffffffffffffff>] 0xffffffffffffffff
interface in which dnsmasq is listening has " tentative dadfailed"
in "scope
global" for ipv6 for all the dnsmasq process that are in D state.
i don't understand why duplicate ipv6 issue is coming when there are
vlan tags
to separate each sub net.For ipv4 duplicate IP issue is not coming
for same subnet.
DAD failure is fatal for the address, as it won't be tried again
without bouncing the interface or tweaking the disable_ipv6 sysctl on
the interface. The "tentative" flag is just showing it is still in
that state (i.e. waiting for DAD to complete). Figuring out why this
is happening will most likely solve your problem, but there isn't
enough here to go on.
The fact that you don't see an IPv4 'duplicate' message is that it's
not going to typically do it, so you could have a duplicate there and
just not know it.
I'd say to try Kilo or Liberty, but it's unclear if this is a Neutron
issue or something more basic with your setup.
Agree with Brian.
Is the problem seen even with a single (or say two) IPv6 subnets? Or is
it seen only at scale?
-Brian
Not able to understand why dnsmasq that are connected to interfaces
that have
"tentative dadfailed " continuously changes between S and D state
while others
are idle.
attached is the strace while dnsmasq is in D state.
Any idea about this issue?
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