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Date:      Tue, 14 Sep 2021 01:12:33 +0300
From:      Konstantin Belousov <kostikbel@gmail.com>
To:        Guido Falsi <mad@madpilot.net>
Cc:        FreeBSD Current <freebsd-current@freebsd.org>
Subject:   Re: recent head having significantly less "avail memory"
Message-ID:  <YT/M0aLEi32sTzM2@kib.kiev.ua>
In-Reply-To: <9e40483c-29e0-303a-eaa4-86d294403868@madpilot.net>
References:  <4c990632-868a-2393-291b-fe7e2bc1974f@madpilot.net> <YT%2BFiWtUKZuZIbIb@kib.kiev.ua> <9e40483c-29e0-303a-eaa4-86d294403868@madpilot.net>

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On Mon, Sep 13, 2021 at 10:07:46PM +0200, Guido Falsi wrote:
> On 13/09/21 19:08, Konstantin Belousov wrote:
> > On Mon, Sep 13, 2021 at 02:59:25PM +0200, Guido Falsi via freebsd-current wrote:
> > > Hi,
> > > 
> > > I updated head recently and today I noticed a difference which looks wrong.
> > > 
> > > At boodt the new head shows signifcantly less avail memory than before,
> > > around 3 GiB less.
> > > 
> > > I moved from commit 71fbc6faed6 [1] where I got:
> > > 
> > > Aug 28 22:03:03 marvin kernel: real memory  = 17179869184 (16384 MB)
> > > Aug 28 22:03:03 marvin kernel: avail memory = 16590352384 (15821 MB)
> > > 
> > > to commit 7955efd574b [2] where I get:
> > > 
> > > Sep 13 10:44:40 marvin kernel: real memory  = 17179869184 (16384 MB)
> > > Sep 13 10:44:40 marvin kernel: avail memory = 13298876416 (12682 MB)
> > > 
> > > I'm seeing this on multiple machines.
> > > 
> > > Unluckily bisecting and trying an older loader.efi in sseparate tests did
> > > not give me any more insight.
> > > 
> > > The recent changes to efi loader, starting with commit 6032b6ba9596 [3] look
> > > like a possible trigger to this, but I have been unable to confirm it.
> > > 
> > > Any suggesstions on how to proceed to debug thiss? ANy idea what a fix could
> > > be?
> > 
> > Is this UEFI or bios boot?
> > Provide verbose dmesg for old and new boots on the same machine.
> > For UEFI boot, show output of 'sysctl machdep.efi_map', again for old
> > and new boots.
> > 
> 
> I shared the data you request here:
> 
> https://www.madpilot.net/cloud/s/ENW5zF7jfmrmFeG

Thanks.

If you do on the loader prompt for the new (AKA bad) kernel
	copy_staging enable
and then boot, does the report of avail memory becomes good?



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