Re: Analysis of slow distro boots in check-avocado (BootLinuxAarch64.test_virt_tcg*)

[Daniel P . Berrangé]

On Tue, Feb 22, 2022 at 04:17:23PM +0000, Alex Bennée wrote:
> 
> Alex Bennée <alex.bennee@linaro.org> writes:
> 
> > Hi,
> >
> > TL;DR:
> >
> >   - pc-bios/edk2-aarch64-code.fd should be rebuilt without debug
> 
> Laszlo,
> 
> Would it be possible to do a less debug enabled version of EDK2 on the
> next update to pc-bios/edk2-*?

NB, Laszlo is no longer  maintaining EDK2 in QEMU, it was handed
over to Philippe.  I'm CC'ing Gerd too since he's a reviewer and
an EDK2 contributor taking over from Lazslo in EDK2 community

> 
> >
> > So my working theory is:
> >
> >   - booting with EFI leaves a number stale code pages
> >   - as the kernel boots it clears these pages triggering lots of
> >     slow-path writes
> >   - result very slow boot
> >
> > I think the only real solution is to improve our TB invalidation code
> > but perhaps another approach would be to detect a high TB invalidation
> > churn and just tb_flush the whole thing and start again?
> >
> > Any thoughts or ideas?
> 
> 
> -- 
> Alex Bennée
> 

Regards,
Daniel
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