From: Joakim Tjernlund <Joakim.Tjernlund@infinera.com>
To: "willy@infradead.org" <willy@infradead.org>,
"david@redhat.com" <david@redhat.com>
Cc: "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 14:50:18 +0000 [thread overview]
Message-ID: <57be40f599e48ea758e0f47e3b16656da0d37f9b.camel@infinera.com> (raw)
In-Reply-To: <1b0ee8f1-d7c9-6bd3-63e8-bfdbacfbc5d8@redhat.com>
On Wed, 2021-10-27 at 16:17 +0200, David Hildenbrand wrote:
> On 27.10.21 15:41, Joakim Tjernlund wrote:
> > On Wed, 2021-10-27 at 14:35 +0100, Matthew Wilcox wrote:
> > > On Wed, Oct 27, 2021 at 12:48:13PM +0000, Joakim Tjernlund wrote:
> > > > 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)
> > >
> > > ... you're complaining that we reduced the amount of reserved ram?
> > > You know that 5.11.0 is more recent than 5.10.75, right?
> >
> > Sort of :)
> > No kernel I have used earlier has reserved so much RAM in the past so I figure that
> > 20 MB in 5.10 is a regression.
> >
> > Reason for using 5.10 is that it is an LTS kernel that will be around for quite a while.
>
> Do you have any comparison against older v5.10 kernels -- IOW, is it a
> regression within the LTS kernels or has it "simply been optimized"
> starting with v5.11 ?
I don't have anything older, we just got started with this project and tried these 2 kernels.
Previous system was ppc with 4.19.x and that is even lower than the two 5.x kernels.
>
> (a lot of things count as reserved, including the initial ramdisk until
> eventually freed, but I assume your setup really just exchanges the kernel)
>
Sure, but this just booting kernel without any disk/fs. The difference should not be that
extrem in 5.10 vs 5.11, should they?
next prev parent reply other threads:[~2021-10-27 14:50 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-27 12:48 kernel 5.10.x Reserves much more RAM than 5.11.0, 8 MB vs 20 MB Joakim Tjernlund
2021-10-27 12:57 ` David Hildenbrand
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 [this message]
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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