[Bloat] Openwrt stability?

[Bloat] Openwrt stability?

[Stephen Hemminger]

I having lots of issues with openwrt stability.
Today's issue seems to be some device on one leg of the home LAN causing OpenWrt router
to crash. That leg has Xbox and other audio gear.

Any idea how to debug this? Is there a way to get serial console?

Re: [Bloat] Openwrt stability?

[Toke Høiland-Jørgensen]

Stephen Hemminger <stephen@networkplumber.org> writes:

> I having lots of issues with openwrt stability.
> Today's issue seems to be some device on one leg of the home LAN causing OpenWrt router
> to crash. That leg has Xbox and other audio gear.
>
> Any idea how to debug this? Is there a way to get serial console?

There usually is, but depending on the device it may involve disassembly
and/or soldering. Which device are you running? And which openwrt
version?

-Toke

Re: [Bloat] Openwrt stability?

[Michael Richardson]

Stephen Hemminger <stephen@networkplumber.org> wrote:
    > Any idea how to debug this? Is there a way to get serial console?

It depends upon your device, but in most cases, open the case, find the pins,
attach USB/TTL interface.  Some newish devices (Turris MOX, for instance),
annoyingly need 1.8V TTL interfaces, which are harder to find and more
expensive. ($20 vs $3)

--
]               Never tell me the odds!                 | ipv6 mesh networks [
]   Michael Richardson, Sandelman Software Works        |    IoT architect   [
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Re: [Bloat] Openwrt stability?

[Daniel Sterling]

On Tue, Jan 5, 2021 at 11:10 AM Michael Richardson <mcr@sandelman.ca> wrote:
>
> Stephen Hemminger <stephen@networkplumber.org> wrote:
>     > Any idea how to debug this? Is there a way to get serial console?
>
> It depends upon your device, but in most cases, open the case, find the pins,
> attach USB/TTL interface.  Some newish devices (Turris MOX, for instance),
> annoyingly need 1.8V TTL interfaces, which are harder to find and more
> expensive. ($20 vs $3)

Best option may be to just buy better supported hardware :)

I've been running openwrt on a small mobile-class PC (sandy bridge
celeron) and then just using stock UBNT SOHO (amplifi HD) access
points for the wifi itself. This is working rather well. The amplifi
units have buffers that are too big but that's mitigated on the
openwrt side with cake

Re: [Bloat] Openwrt stability?

[Stephen Hemminger]

On Tue, 5 Jan 2021 11:49:58 -0500
Daniel Sterling <sterling.daniel@gmail.com> wrote:

> On Tue, Jan 5, 2021 at 11:10 AM Michael Richardson <mcr@sandelman.ca> wrote:
> >
> > Stephen Hemminger <stephen@networkplumber.org> wrote:  
> >     > Any idea how to debug this? Is there a way to get serial console?  
> >
> > It depends upon your device, but in most cases, open the case, find the pins,
> > attach USB/TTL interface.  Some newish devices (Turris MOX, for instance),
> > annoyingly need 1.8V TTL interfaces, which are harder to find and more
> > expensive. ($20 vs $3)  
> 
> Best option may be to just buy better supported hardware :)
> 
> I've been running openwrt on a small mobile-class PC (sandy bridge
> celeron) and then just using stock UBNT SOHO (amplifi HD) access
> points for the wifi itself. This is working rather well. The amplifi
> units have buffers that are too big but that's mitigated on the
> openwrt side with cake

It is Linksys WRT3200ACM which seemed the best at the time.

Did get the problem down to one device on home network is doing something
that causes crash. It happens now about 20sec after startup.
I suspect a kernel bug and magic bad packet (fragmentation?).

Re: [Bloat] Openwrt stability?

[Sebastian Moeller]

Hi Stephen,

> On Jan 5, 2021, at 05:55, Stephen Hemminger <stephen@networkplumber.org> wrote:
> 
> I having lots of issues with openwrt stability.
> Today's issue seems to be some device on one leg of the home LAN causing OpenWrt router
> to crash. That leg has Xbox and other audio gear.
> 
> Any idea how to debug this? Is there a way to get serial console?

on ancient MIPS routers:
cat /sys/kernel/debug/crashlog > last_crash_log

can get you some information after the router crashed and rebooted, not sure that this works for other architectures though (also not sure the centents will help debugging you issue).

Best Regards
	sebastian


> 
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Re: [Bloat] OpenWrt Stability?

[Rich Brown]

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> On Jan 5, 2021, at 12:00 PM, Stephen Hemminger wrote:
> 
> I having lots of issues with openwrt stability.

I know the OpenWrt dev's are going hammer and tongs to produce a 2x.0x release (which will be out soon-ish...)

What release and what hardware are you using? (There may be fixes in the newest snapshots, and if not, you may be able to provide valuable debugging info.)

Rich

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Re: [Bloat] OpenWrt Stability?

[Stephen Hemminger]

On Tue, 5 Jan 2021 12:08:56 -0500
Rich Brown <richb.hanover@gmail.com> wrote:

> > On Jan 5, 2021, at 12:00 PM, Stephen Hemminger wrote:
> > 
> > I having lots of issues with openwrt stability.  
> 
> I know the OpenWrt dev's are going hammer and tongs to produce a 2x.0x release (which will be out soon-ish...)
> 
> What release and what hardware are you using? (There may be fixes in the newest snapshots, and if not, you may be able to provide valuable debugging info.)
> 
> Rich

I am running latest stable 19.07.4