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[209.85.220.41]) by mx.google.com with SMTPS id j131sor18245427vsd.72.2019.04.08.10.32.25 for (Google Transport Security); Mon, 08 Apr 2019 10:32:25 -0700 (PDT) Received-SPF: pass (google.com: domain of pankajssuryawanshi@gmail.com designates 209.85.220.41 as permitted sender) client-ip=209.85.220.41; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=l5c7+WZx; spf=pass (google.com: domain of pankajssuryawanshi@gmail.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=pankajssuryawanshi@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=ajZNHx/mikUePwu4fOF1edmFuVfA9nuB9PUv4B+gVXo=; b=l5c7+WZx6MfsyrofU3Pmy0q97Z5nBitN+Sjxf5Co/Z3gGd4ZM+9A6ZrPKLJpZiaUTH CsHC4gWe26RJx5Rj/UZBbL2MlkhE+MymDeI/vwAlgwYHkwKkynao0I5iqOCjDUtfc1Qr VBR49ZvovNS62zVmW6RqcPaJvpBxAtB3pBQvRZXtDrQ8TkTRlOKvslA/5A+td08DI0P8 285qCEVFrB0/MujELW3bVXp9gZHgM8hgy3To5BPt5qHUmiCKIht8IXVe1ZK8mWylUIGx e4h/0W05JgSUiGcPJOxfQzYFFKyUqLg8sW7howIrQVq0c61JPrNv3tNsGTn3pXy9e6V+ 9tHw== X-Google-Smtp-Source: APXvYqxvoOvMGsdGQ57l/2vJ38ZLo/tTfijphZX/eefshUQXutbAVGd39edodapItVKrCZLbXwLdQqKszGePOVSp3vs= X-Received: by 2002:a05:6102:3c2:: with SMTP id n2mr17487291vsq.41.1554744745049; Mon, 08 Apr 2019 10:32:25 -0700 (PDT) MIME-Version: 1.0 From: Pankaj Suryawanshi Date: Mon, 8 Apr 2019 23:02:13 +0530 Message-ID: Subject: Memory Configuration for 32-bit, 64-bit and PAE enabled OS To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, kernelnewbies@kernelnewbies.org Content-Type: multipart/alternative; boundary="0000000000003ec4b10586083832" 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: --0000000000003ec4b10586083832 Content-Type: text/plain; charset="UTF-8" I am confuse about memory configuration, i have below questions. 1.if 32-bit os maximum virtual address is 4GB, When i have 4 gb of ram for 32-bit os, What about the virtual memory size ? is it required virtual memory(disk space) or we can directly use physical memory ? 2.In 32-bit os 12 bits are offset because page size=4k i.e 2^12 and 2^20 for page addresses What about 64-bit os, What is offset size ? What is page size ? How it calculated. 3.What is PAE? If enabled how to decide size of PAE, what is maximum and minimum size of extended memory. Regards, Pankaj --0000000000003ec4b10586083832 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
I am confuse about memory configuration, i have below ques= tions.

1.if 32-bit os maximum virtual address is 4GB, When i have 4 = gb of ram for 32-bit os, What about the virtual memory size ? is it require= d virtual memory(disk space) or we can directly use physical memory ?
2.In 32-bit os 12 bits are offset because page size=3D4k i.e 2^12 and 2^2= 0 for page addresses What about 64-bit os, What is offset size ? What is pa= ge size ? How it calculated.

3.What is PAE? If enabled how to d= ecide size of PAE, what is maximum and minimum size of extended memory.

Regards,
Pankaj

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