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List:       netbsd-current-users
Subject:    Re: What to do about "WARNING: negative runtime; monotonic clock has gone backwards"
From:       Brad Spencer <brad () anduin ! eldar ! org>
Date:       2023-08-02 17:53:29
Message-ID: xonwmyd2uw6.fsf () anduin ! eldar ! org
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Taylor R Campbell <riastradh@NetBSD.org> writes:

[snip]

> Can you try the attached patch on a dom0 and see if you still observe
> drift?


I had a little time to mess with trying 10.99.6 on the DOM0..  I applied
your patch to 10.99.6 and built a XEN3_DOM0 kernel (XEN3_DOM0 + bigger
IFQ_MAXLEN).  The result was, while the kernel booted up, when a 32 bit
9.x PVH+PVSHIM guest performed its ifconfig against a xennet interface,
the DOM0 rebooted.  No DDB, no obvious panic message,...  just a hang
for a bit and a reboot.  I also observed the DOM0 appear to hang up hard
before the guest started while poking at other stuff.  I don't know if
the patch caused the trouble, or if 10.99.6 has trouble for me in a
general sense (or if I am not allowed any more to make IFQ_MAXLEN larger
than the default).  I won't have time to mess with this again for a
while, but the results were not encouraging.


-- 
Brad Spencer - brad@anduin.eldar.org - KC8VKS - http://anduin.eldar.org
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