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.
-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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