On 04/01/2016 15:21, Prem Anand Haridoss wrote:
On booting an iso (from the cdrom) with 8G memory, after bootup, I see
8179816 kB as the total memory available.
However on PXE booting the same vCPE livecd iso over a nic, with the
same 8G memory, we see only 7857512 kB as the total memory available
Is this a bug in qemu? I am using version 2.5.0 (Debian 1:2.5+dfsg-1)
Regards
Prem
Logs:
=====
On booting iso using cdrom
--------------------------
pharidos@uks2:~/work/tplaf/☸qemu-system-x86_64 -name Test -nographic
-enable-kvm -cpu Haswell -smp 2 -m 8G -cdrom $iso -boot d
ISOLINUX 4.05 20121210 Copyright (C) 1994-2011 H. Peter Anvin et al
Press control and F then 1 for help, or ENTER to
boot: live-serial init=/bin/bash
Loading, please wait...
bash: no job control in this shell
root@(none):/#
root@(none):/# cat /proc/meminfo | head -n3
MemTotal: 8179816 kB
MemFree: 8138960 kB
MemAvailable: 8131960 kB
On pxe booting the iso over a nic
---------------------------------
pharidos@uks2:~/☸qemu-system-x86_64 -name Test -nographic -enable-kvm
-cpu Haswell -smp 2 -m 8G -netdev
user,id=net0,tftp=$HOME/TPLAF//TB2/rtr2/tftp,bootfile=/gpxelinux.0
-device rtl8139,netdev=net0 -boot once=n
PXELINUX 6.03 PXE 6.03-pre20 Copyright (C) 1994-2014 H. Peter Anvin et al
boot: Build109.11
Loading memdisk... ok
Loading <deleted>...ok
ISOLINUX 4.05 20121210 Copyright (C) 1994-2011 H. Peter Anvin et al
Press control and F then 1 for help, or ENTER to
boot: live-serial init=/bin/bash
Loading, please wait...
bash: no job control in this shell
root@(none):/#
root@(none):/# cat /proc/meminfo | head -n3
MemTotal: 7857512 kB
MemFree: 7816764 kB
MemAvailable: 7809988 kB
Presumably, the PXE BIOS needs some RAM for the network
stack and CD-ROM emulation.
Perhaps it simply loads the entire ISO image into RAM
before booting it, so the boot process can play with
the network adapter without loosing access to its "CD".
Check if the difference is close to the size of the ISO
file.
Enjoy
Jakob
--
Jakob Bohm, CIO, Partner, WiseMo A/S. https://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark. Direct +45 31 13 16 10
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