[问题]大家的系统刚启动的时候占多少内存？

[sagi]

top - 22:46:29 up 46 min, 2 users, load average: 0.30, 0.39, 0.22
Tasks: 128 total, 1 running, 126 sleeping, 0 stopped, 1 zombie
Cpu(s): 4.3%us, 1.2%sy, 0.5%ni, 91.9%id, 2.1%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 1026056k total, 768828k used, 257228k free, 16812k buffers
Swap: 995988k total, 0k used, 995988k free, 354144k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
6047 sagi 20 0 16108 9312 5472 S 4 0.9 0:09.38 compiz.real
5195 mysql 20 0 124m 16m 4704 S 2 1.6 0:00.77 mysqld
5625 root 20 0 396m 48m 8612 S 2 4.9 1:07.38 Xorg
7453 sagi 20 0 175m 74m 25m S 2 7.4 1:41.45 firefox
1 root 20 0 2844 1692 544 S 0 0.2 0:01.32 init
2 root 15 -5 0 0 0 S 0 0.0 0:00.00 kthreadd
3 root RT -5 0 0 0 S 0 0.0 0:00.00 migration/0
4 root 15 -5 0 0 0 S 0 0.0 0:00.08 ksoftirqd/0
5 root RT -5 0 0 0 S 0 0.0 0:00.00 watchdog/0
6 root RT -5 0 0 0 S 0 0.0 0:00.00 migration/1
7 root 15 -5 0 0 0 S 0 0.0 0:00.00 ksoftirqd/1
8 root RT -5 0 0 0 S 0 0.0 0:00.00 watchdog/1
9 root 15 -5 0 0 0 S 0 0.0 0:00.02 events/0
10 root 15 -5 0 0 0 S 0 0.0 0:00.02 events/1
11 root 15 -5 0 0 0 S 0 0.0 0:00.00 khelper
46 root 15 -5 0 0 0 S 0 0.0 0:00.04 kblockd/0
47 root 15 -5 0 0 0 S 0 0.0 0:00.00 kblockd/1

快800M了，哪位大虾知道怎么回事？帮忙优化一下哈^_^

[想入非非]

poplar@poplar-gnome:~$ free -m
total used free shared buffers cached
Mem: 1518 1062 456 0 65 542
-/+ buffers/cache: 455 1063
Swap: 854 0 854

刚刚启动的时候我倒是没有什么注意。。。