freebsd stable - Sep 2016 - 11.0 stuck on high network load

On Wed, Sep 14, 2016 at 03:04:20PM -0700, hiren panchasara wrote:
> On 09/15/16 at 12:57P, Slawa Olhovchenkov wrote:
> > On Wed, Sep 14, 2016 at 02:43:06PM -0700, hiren panchasara wrote:
> > 
> > > On 09/15/16 at 12:35P, Slawa Olhovchenkov wrote:
> > > > On Sun, Sep 04, 2016 at 06:46:12PM -0700, hiren panchasara
wrote:
> > > > 
> > > > > On 09/05/16 at 12:57P, Slawa Olhovchenkov wrote:
> > > > > > I am try using 11.0 on Dual E5-2620 (no X2APIC).
> > > > > > Under high network load and may be addtional
conditional system go to
> > > > > > unresponsible state -- no reaction to network and
console (USB IPMI
> > > > > > emulation). INVARIANTS give to high overhad. Is
this exist some way to
> > > > > > debug this?
> > > > > 
> > > > > Can you panic it from console to get to db> to get
backtrace and other
> > > > > info when it goes unresponsive?
> > > > 
> > > > ipmi console don't respond (chassis power diag don't
react)
> > > > login on sol console stuck on *tcp.
> > > 
> > > I assume you tried ~^b (tilda followed by ctrl+b) without
success?
> > 
> > ~B, as in man ipmitool
> 
> No, not shift-b but ctrl-b.
> 
> I am not aware of ipmitool reference. On unresponsive console, try
> ~^b (tilda followed by ctrl+b)
ipmitool ~B send break, do you talk about break or about special
serial console keystroke to enter debuger, distinct from break?
> > 
> > > That usually drops into db>
> > 
> > May be now need some sysctl for enable this?
> 
> There is a sysctl for this too but on console, the keystrokes I said
> should work, imo.
> 
> Cheers,
> Hiren

On Thu, Sep 15, 2016 at 01:13:35AM +0300, Slawa Olhovchenkov
wrote:
> On Wed, Sep 14, 2016 at 03:04:20PM -0700, hiren panchasara wrote:
> 
> > On 09/15/16 at 12:57P, Slawa Olhovchenkov wrote:
> > > On Wed, Sep 14, 2016 at 02:43:06PM -0700, hiren panchasara wrote:
> > > 
> > > > On 09/15/16 at 12:35P, Slawa Olhovchenkov wrote:
> > > > > On Sun, Sep 04, 2016 at 06:46:12PM -0700, hiren
panchasara wrote:
> > > > > 
> > > > > > On 09/05/16 at 12:57P, Slawa Olhovchenkov wrote:
> > > > > > > I am try using 11.0 on Dual E5-2620 (no
X2APIC).
> > > > > > > Under high network load and may be addtional
conditional system go to
> > > > > > > unresponsible state -- no reaction to network
and console (USB IPMI
> > > > > > > emulation). INVARIANTS give to high overhad.
Is this exist some way to
> > > > > > > debug this?
> > > > > > 
> > > > > > Can you panic it from console to get to db> to
get backtrace and other
> > > > > > info when it goes unresponsive?
> > > > > 
> > > > > ipmi console don't respond (chassis power diag
don't react)
> > > > > login on sol console stuck on *tcp.
> > > > 
> > > > I assume you tried ~^b (tilda followed by ctrl+b) without
success?
> > > 
> > > ~B, as in man ipmitool
> > 
> > No, not shift-b but ctrl-b.
> > 
> > I am not aware of ipmitool reference. On unresponsive console, try
> > ~^b (tilda followed by ctrl+b)
> 
> ipmitool ~B send break, do you talk about break or about special
> serial console keystroke to enter debuger, distinct from break?
A lot of old console servers used to send break when they reset or
on boot, so the FreeBSD console does not break to debugger when
a break command is received.  That's why the tidla CTRL-b is
required as it's sufficiently unlikely to be accidentally sent by
equipment connected to the serial console.

Regards,

Gary