Heres my benches, done in two days so dates are weird and results are very approximative.
What surprises me are in the Part 2, swap occured.
In 3 and 4, the ram is eaten up, even if the vm just booted.
------------------------------------
Part 0
End of boot :
bash-3.1$ free
total used free shared buffers cached
Mem: 2056840 500836 1556004 0 2244 359504
-/+ buffers/cache: 139088 1917752
Swap: 3903784 0 3903784
------------------------------------
Part 1
qemu-system-x86_64 -m 1024 -vga std -usb -usbdevice tablet -localtime -soundhw es1370 -name qlio -drive file=/mnt/hd/sda/sda1/tmp/relqlio.img,cache=none
bash-3.1$ free
total used free shared buffers cached
Mem: 2056840 1656280 400560 0 34884 378332
-/+ buffers/cache: 1243064 813776
Swap: 3903784 0 3903784
bash-3.1$ ls -lsa /mnt/hd/sda/sda1/tmp/relqlio.img
58946 -rw-r--r-- 1 ftournier info 60424192 2010-09-16 17:49 /mnt/hd/sda/sda1/tmp/relqlio.img
650M download inside the vm
bash-3.1$ free
total used free shared buffers cached
Mem: 2056840 1677648 379192 0 33860 397716
-/+ buffers/cache: 1246072 810768
Swap: 3903784 0 3903784
bash-3.1$ ls -lsa /mnt/hd/sda/sda1/tmp/relqlio.img
914564 -rw-r--r-- 1 ftournier info 935723008 2010-09-20 14:07 /mnt/hd/sda/sda1/tmp/relqlio.img
------------------------------------
Part 2
reboot
qemu-system-x86_64 -m 1024 -vga std -usb -usbdevice tablet -localtime -soundhw es1370 -name qlio -drive file=/mnt/hd/sda/sda1/tmp/relqlio.img
bash-3.1$ free
total used free shared buffers cached
Mem: 2056840 2040172 16668 0 32952 758948
-/+ buffers/cache: 1248272 808568
Swap: 3903784 0 3903784
bash-3.1$ ls -lsa /mnt/hd/sda/sda1/tmp/relqlio.img
60739 -rw-r--r-- 1 ftournier info 62259200 2010-09-16 17:57 /mnt/hd/sda/sda1/tmp/relqlio.img
650M download inside the vm
bash-3.1$ free
total used free shared buffers cached
Mem: 2056840 2040540 16300 0 34412 765208
-/+ buffers/cache: 1240920 815920
Swap: 3903784 8160 3895624
bash-3.1$ ls -lsa /mnt/hd/sda/sda1/tmp/relqlio.img
842430 -rw-r--r-- 1 ftournier info 861929472 2010-09-20 14:20 /mnt/hd/sda/sda1/tmp/relqlio.img
------------------------------------
Part 3
reboot
qemu-system-x86_64 -m 1024 -vga std -usb -usbdevice tablet -localtime -soundhw es1370 -name qlio -drive file=/tmp/relqlio.img
note : /tmp is a tmpfs filesystem
bash-3.1$ free
total used free shared buffers cached
Mem: 2056840 2009688 47152 0 248 766328
-/+ buffers/cache: 1243112 813728
Swap: 3903784 0 3903784
bash-3.1$ ls -lsa /tmp/relqlio.img
59848 -rw-r--r-- 1 ftournier info 61407232 2010-09-16 18:04 /tmp/relqlio.img
650M download inside the vm
bash-3.1$ free
total used free shared buffers cached
Mem: 2056840 2041404 15436 0 128 921276
-/+ buffers/cache: 1120000 936840
Swap: 3903784 248804 3654980
bash-3.1$ ls -lsa /tmp/relqlio.img
885448 -rw-r--r-- 1 ftournier info 906821632 2010-09-20 14:40 /tmp/relqlio.img
------------------------------------
Part 4
reboot
qemu-system-x86_64 -m 1024 -vga std -usb -usbdevice tablet -localtime -soundhw es1370 -name qlio -drive file=/dev/shm/relqlio.img
bash-3.1$ free
total used free shared buffers cached
Mem: 2056840 2009980 46860 0 172 767328
-/+ buffers/cache: 1242480 814360
Swap: 3903784 0 3903784
bash-3.1$ ls -lsa /dev/shm/relqlio.img
58496 -rw-r--r-- 1 ftournier info 59899904 2010-09-16 18:11 /dev/shm/relqlio.img
650M download inside the vm
bash-3.1$ free
total used free shared buffers cached
Mem: 2056840 2041576 15264 0 92 938976
-/+ buffers/cache: 1102508 954332
Swap: 3903784 266232 3637552
bash-3.1$ ls -lsa /dev/shm/relqlio.img
1016912 -rw-r--r-- 1 ftournier info 1039400960 2010-09-20 15:15 /dev/shm/relqlio.img
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