Re: bcm283x_dwcotg0: usbpf: Out of memory

Mark Millard <[email protected]> writes:

> On 4/16/26 20:50, Carl Johnson wrote:
>> bob prohaska <[email protected]> writes:
>> 
>>> On Thu, Apr 16, 2026 at 10:45:06AM -0700, Mark Millard wrote:
>>>
>>> It turns out a 1.8GB swap partition does not provoke the "excess 
>>> swap" warning and seems sufficient for a -j3 buildworld to proceed.
>>> -j4 works usually, but if Clang is fully rebuilt in -j4 the machine
>>> _can_ run out of swap and kill processes.  
>>>
>>> Using swap on microSD or USB flash led (I think) to subtle binary
>>> corruption that you helped me sort out. Since then I've used only
>>> mechanical hard disks for swap and have not seen any obvious repeats.
>> 
>> I was looking at some old notes for a Raspberry Pi 2 and I had set
>> kern.maxswzone=20971520 in /boot/loader.conf with 3.5GB of swap space.
>
> Do you know what tradeoffs were involved from the use of:
> kern.maxswzone=20971520 ?
>
> I've never figured out how to tell better from worse non-default
> settings based on whatever the specific tradeoffs are versus workload
> needs.

No, I don't know what tradeoffs were involved.  It was just something
that I had tried that worked.  My notes show that I also tried 15000000
and that wasn't large enough.  I have also never been able to figure out
what is best.

>> That was on a swap partition on a 64GB SD card.  I am not sure what size
>> was necessary, but that was something that worked then without the swap
>> space too large warning.  I haven't tried that for some time, so I can't
>> offer any more help than that.  It looks like I was running FreeBSD
>> 12.1-RELEASE at that time.
>> 
>> I hope that helps some.
>> 

-- 
Carl Johnson		[email protected]