On 18/11/15 12:23, green krypton wrote: > I have around 500 dnsmasq process which are configured to give ipv6,ipv4 > addresses out of this some fluctuate 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" error for ipv6 . > > 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? > >
Dnsmasq polls every second whilst one or more interfaces it's listening on are still doing DAD. Once all interfaces have completed DAD,it stops polling. Are you really running 500 separate instances on dnsmasq? That's an installation which is way out of the normal way of doing things. Cheers, Simon. > > _______________________________________________ > Dnsmasq-discuss mailing list > Dnsmasq-discuss@lists.thekelleys.org.uk > http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss > _______________________________________________ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
