From: David Hildenbrand <david@redhat.com>
To: Joakim Tjernlund <Joakim.Tjernlund@infinera.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: kernel 5.10.x Reserves much more RAM than 5.11.0, 8 MB vs 20 MB
Date: Wed, 27 Oct 2021 14:57:20 +0200 [thread overview]
Message-ID: <259fa6ca-5149-268e-716b-68361f3fa1ca@redhat.com> (raw)
In-Reply-To: <71b597cb9a89c9f033861513da393501f04f4098.camel@infinera.com>
On 27.10.21 14:48, Joakim Tjernlund wrote:
> Using a fairly minimal kernel I get a big difference in Reserved memory, using:
> qemu-system-aarch64 -machine virt -kernel arch/arm64/boot/Image -cpu cortex-a53 -nographic -m 32M
>
> I get this:
> Linux version 5.11.0
> Memory: 24052K/32768K available (3520K kernel code, 684K rwdata, 548K rodata, 320K init, 245K bss, 8716K reserved, 0K cma-reserved)
>
> Versus:
>
> Linux version 5.10.75
> Memory: 11836K/32768K available (3518K kernel code, 684K rwdata, 540K rodata, 320K init, 244K bss, 20932K reserved, 0K cma-reserved)
>
> Reserving 20 MB RAM on a 32 MB is way too much, even 8Mb is a bit much for us.
Are you using comparable kernel configs? Can you share them?
Further, can you share /proc/meminfo and /proc/zoneinfo of both instances?
(eventually, memblock=debug could be helpful as well, but it generates a
lot of data)
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2021-10-27 12:57 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-27 12:48 Joakim Tjernlund
2021-10-27 12:57 ` David Hildenbrand [this message]
2021-10-27 13:20 ` Joakim Tjernlund
2021-10-27 13:35 ` Matthew Wilcox
2021-10-27 13:41 ` Joakim Tjernlund
2021-10-27 14:17 ` David Hildenbrand
2021-10-27 14:50 ` Joakim Tjernlund
2021-10-27 17:12 ` Yang Shi
2021-10-28 9:55 ` Joakim Tjernlund
2021-10-28 21:52 ` Yang Shi
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