Looks like the same issue I have with pf pf5.6 & 5.7 on, Debian 7.
I suspect it is related to dhcpd and not to pf.
Please note that it appears only when there is a lot of omapi resolution : we
could not reproduce the bug on our testing installation, only the production
one.
I would be curious to know if the this issue still appears on Debian 8 (with
isc-dhcpd-4.3), as s ymptoms are the same than this old issue fixed in
isc-dhcpd 4.2.1:
- Disable the use of kqueue in the ISC library. This avoids a problem
between the fork and socket code that caused the dhcpd process to
use all available cpu if the program daemonized itself.
[ISC-Bugs #21911]
cf https://kb.isc.org/article/AA-00852/0/DHCP-4.2.5-Release-Notes.html
Regards,
----- Mail original -----
> De: "Derek Wuelfrath" <[email protected]>
> À: "ML PF" <[email protected]>
> Envoyé: Lundi 25 Avril 2016 22:45:13
> Objet: Re: [PacketFence-users] PF 6 Inline: dhcpd eats CPU
> > An strace on the 100% cpu dhcpd looks like this:
> We might need a bit more than that if we want to have a look at what
> the process “is doing"
> Cheers!
> -dw.
> —
> Derek Wuelfrath
> [email protected] :: +1.514.447.4918 (x110) :: +1.866.353.6153
> (x110)
> Inverse inc. :: Leaders behind SOGo (www.sogo.nu) and PacketFence
> (www.packetfence.org)
> > On Apr 25, 2016, at 16:22, Felix Eckhofer <[email protected]> wrote:
> >
> > Hey.
> >
> > Am 25.04.2016 21:40, schrieb Derek Wuelfrath:
> >>> We're seeing the same behavior, but only on one of the two nodes
> >>> in
> >>> the
> >>> cluster.
> >>
> >> Running RHEL (includes CentOS) or Debian ?
> >
> > Debian wheezy.
> > An strace on the 100% cpu dhcpd looks like this:
> >
> > select(30, [4 5 7 8 9 11 12 13 15 22 23 24 28], [10], NULL, {0, 0})
> > = 5
> > (in [15 22 23 24 28], left {0, 0})
> > read(17, "", 4047) = 0
> > read(25, "", 4047) = 0
> > read(26, "", 4047) = 0
> > read(29, "", 4047) = 0
> > read(14, "", 4047) = 0
> > select(30, [4 5 7 8 9 11 12 13 14 17 25 26 29], [10], NULL, {0, 0})
> > = 5
> > (in [14 17 25 26 29], left {0, 0})
> > read(16, "", 4047) = 0
> > read(18, "", 4047) = 0
> > read(19, "", 4047) = 0
> > read(27, "", 4047) = 0
> > read(15, "", 4047) = 0
> > select(30, [4 5 7 8 9 11 12 13 15 16 18 19 27], [10], NULL, {0, 0})
> > = 5
> > (in [15 16 18 19 27], left {0, 0})
> > read(22, "", 4047) = 0
> > read(23, "", 4047) = 0
> > read(24, "", 4047) = 0
> > read(28, "", 4047) = 0
> > read(14, "", 4047) = 0
> > ...
> >
> >
> > Regards
> > felix
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