Rapid link state changes on bge(4) interface

Slawek Zak slawek.zak at gmail.com
Thu Sep 21 03:32:59 PDT 2006


On 9/15/06, Gleb Smirnoff <glebius at freebsd.org> wrote:
> On Wed, Sep 13, 2006 at 03:09:56PM +0200, Slawek Zak wrote:
> S> I'm testing network failover on IBM BladeCenter running FreeBSD 6.1
> S> STABLE for Sep 6th.
> S>
> S> I suspect a problem with link state change detection in bge code. When
> S> I disable internal port on chassis built-in ethernet switch, kernel
> S> floods syslog with messages about link state changes and coalescing
> S> them. Log snippet follows:
> S>
> S> Sep 13 14:58:28 w3-6 kernel: bge1: link state changed to DOWN
> S> Sep 13 14:58:28 w3-6 kernel: bge1: link state changed to UP
> S> Sep 13 14:58:29 w3-6 kernel: bge1: link state changed to DOWN
> S> Sep 13 14:58:29 w3-6 kernel: bge1: link state changed to UP
> S> Sep 13 14:58:29 w3-6 kernel: bge1: link state changed to DOWN
> S> Sep 13 14:58:29 w3-6 kernel: bge1: 4 link states coalesced
> S> Sep 13 14:58:29 w3-6 kernel: bge1: link state changed to DOWN
> S> Sep 13 14:58:29 w3-6 kernel: bge1: 11 link states coalesced
> S> Sep 13 14:58:29 w3-6 kernel: bge1: link state changed to UP
> S> Sep 13 14:58:30 w3-6 kernel: bge1: link state changed to DOWN
> S> Sep 13 14:58:30 w3-6 kernel: bge1: 3 link states coalesced
> S> Sep 13 14:58:30 w3-6 kernel: bge1: link state changed to UP
> S> Sep 13 14:58:30 w3-6 kernel: bge1: 7 link states coalesced
> S> Sep 13 14:58:30 w3-6 kernel: bge1: link state changed to DOWN
> S> Sep 13 14:58:30 w3-6 kernel: bge1: 4 link states coalesced
> S> Sep 13 14:58:30 w3-6 kernel: bge1: link state changed to DOWN
> S> Sep 13 14:58:30 w3-6 kernel: bge1: 2 link states coalesced
> S>
> S> As you can see, messages are generated in rapid succession and
> S> therefore any probing of link state change by ng_one2many for
> S> interface failover is meaningless. Ethernet switch doesn't register
> S> and log any interface state changes after disabling this port. LS20
> S> blades use chipset 8850. My firmware is 3.38, full changelog, if it is
> S> of any help, is here:
> S>
> S> http://www-307.ibm.com/pc/support/site.wss/license.do?filename=pc_servers/brcm_fw_nic_12021_anyos_anycpu.chg
> S>
> S> Any ideas what might be wrong?
>
> Please try to add hw.bge.fake_autoneg=1 to /boot/loader.conf. May be
> this will help.

I did it, but sysctl doesn't show the value.

w3-6# sysctl hw.bge
sysctl: unknown oid 'hw.bge'

This sysctl seems to be defined in if_bge.c though:

static int bge_fake_autoneg = 0;
TUNABLE_INT("hw.bge.fake_autoneg", &bge_fake_autoneg);

/S
-- 
Sławek Żak / UNIX Systems Administrator


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