Re: zfsloader: messy output on Dell iDrac serial console

[bob prohaska]

On Sat, Apr 07, 2018 at 12:21:47PM +0800, Julian Elischer wrote:
> running on *some* Dell servers the serial console looks messed up at 
> the time of the FreeBSD menu.
> it looks like it's dropping (or adding? but that's less likely) 
> characters.
> 
>  ??|?? 5. [K]ernel: kernel (1 of 2) |?? .- 
> .?? -.
>  ??|?? 6. Configure Boot [O]ptions... |2?? --| y/ 
> -. 

Scrambled console output has shown up on a Pi3 under what might be called
overload conditions, things like make -j8 buildworld and running of stress2's
default test suite. It doesn't seem to be a serial issue in that case.

Hard to believe you're seeing something related, but my $.02 anyway.

bob prohaska

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Re: zfsloader: messy output on Dell iDrac serial console

[Daniel Braniss]

> On 7 Apr 2018, at 7:21, Julian Elischer  wrote:
> 
> running on *some* Dell servers the serial console looks messed up at the time 
> of the FreeBSD menu.
> it looks like it's dropping (or adding? but that's less likely) characters.
> 
>  |  5. [K]ernel: kernel (1 of 2)   |  .- .-.
>  |  6. Configure Boot [O]ptions... |2  --| y/   -.   -/`   -o/
>  |137. Select Boot [E]nvironment...| `:`  `:` 
> ::/sy++:.
>  | H| .-- `--. --  /6H`:  
> :`
>  | | .---..
> 
> IS there an RTS/CTS input we should be attending to?
> 
> I will add that some of the other modules (e.g. the mfi raid setup section) 
> also get affected,
> so it's not just a bug in our code.

I’m using Serial-Over-LAN via ipmi/drac and am noticing this too on a Dell 
C6220,
don’t know when this started though, It’s only recently that I’m working on
this kind of hosts. It drives the xterm/rxvt crazy, but it’s only the output 
from the
boot/loader, once the kernel takes over, all is back to normal. the serial 
speed is
set to 115200, but changing it as far as i remember did not help. will try 
lowering soon.
I had to disable the menu to get some sense of the output, and usually have to 
hit ^B to remove most of the
garbage.



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