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[79.242.61.118]) by smtp.gmail.com with ESMTPSA id l20sm4272023wmq.42.2021.10.27.07.17.59 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 27 Oct 2021 07:18:00 -0700 (PDT) Message-ID: <1b0ee8f1-d7c9-6bd3-63e8-bfdbacfbc5d8@redhat.com> Date: Wed, 27 Oct 2021 16:17:59 +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 , "willy@infradead.org" Cc: "linux-mm@kvack.org" References: <71b597cb9a89c9f033861513da393501f04f4098.camel@infinera.com> From: David Hildenbrand Organization: Red Hat In-Reply-To: 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-Server: rspam02 X-Rspamd-Queue-Id: 129C050000B6 X-Stat-Signature: jah4jsccndemokniwwzmxxwkd1o7qyh4 Authentication-Results: imf04.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=TanrtR4A; dmarc=pass (policy=none) header.from=redhat.com; spf=none (imf04.hostedemail.com: domain of david@redhat.com has no SPF policy when checking 170.10.129.124) smtp.mailfrom=david@redhat.com X-HE-Tag: 1635344278-159679 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 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 ? (a lot of things count as reserved, including the initial ramdisk until eventually freed, but I assume your setup really just exchanges the kernel) -- Thanks, David / dhildenb