Re: [OE-core] [PATCH 1/2] qemurunner: Impove stdout logging handling

[Richard Purdie <richard.purdie@linuxfoundation.org>]

On Mon, 2023-12-18 at 22:27 +0000, Alex Bennée wrote:
> "Richard Purdie" <richard.purdie@linuxfoundation.org> writes:
> 
> > On Mon, 2023-12-18 at 09:45 -0800, Khem Raj wrote:
> > > I tried the two patches in this series. It did improve the situation
> > > but I am still getting SSH timeouts. But this time its 13 tests
> > > earlier it used to be 40+
> > > btw. my images are using systemd. So it might be good to see if we see
> > > this with poky-altcfg as well or not.
> > 
> > Do you have the log.do_testimage and the ${WORKDIR}/testimage/ files?
> > 
> > Did you still see rcu stalls in the logs?
> 
> rcu stalls in the kernel is just a sign of QEMU's relative inefficiency
> compared to real HW. However multiple -smp will help alleviate busy
> vCPUs if you can. If you want guest time to be a bit more realistic you
> can use icount but actual wall clock time will be longer as you can only
> have one thread.

We have thought that but I realised rcu stalls in the 8250 serial TX
path could mean something quite different, related to 2/2 in this
series.

Cheers,

Richard