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[79.242.61.118]) by smtp.gmail.com with ESMTPSA id t6sm15918357wrw.78.2021.10.27.05.57.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 27 Oct 2021 05:57:21 -0700 (PDT) Message-ID: <259fa6ca-5149-268e-716b-68361f3fa1ca@redhat.com> Date: Wed, 27 Oct 2021 14:57:20 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.1.0 Subject: Re: kernel 5.10.x Reserves much more RAM than 5.11.0, 8 MB vs 20 MB To: Joakim Tjernlund , "linux-mm@kvack.org" References: <71b597cb9a89c9f033861513da393501f04f4098.camel@infinera.com> From: David Hildenbrand Organization: Red Hat In-Reply-To: <71b597cb9a89c9f033861513da393501f04f4098.camel@infinera.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: D935D10004CA Authentication-Results: imf07.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=NVXNaG1n; spf=none (imf07.hostedemail.com: domain of david@redhat.com has no SPF policy when checking 216.205.24.124) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com X-Stat-Signature: ta1q3ez3yrwqi9jhrw934r38j4qbft9s X-Rspamd-Server: rspam06 X-HE-Tag: 1635339444-851611 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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