system uses too much memory

[just_hoster]

so, i have Debian X64 system with 4 GB ram.

ispcp 1.0.3 installed. traffic about 60 GB a day.

system uses all memory. TOP doesnt show me which process uses so much memory.

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
18013 mysql 20 0 162m 44m 5212 S 7 1.1 0:35.19 mysqld
17906 vu2002 20 0 192m 11m 6616 R 5 0.3 0:05.64 php5-cgi
19516 www-data 20 0 398m 11m 1528 S 3 0.3 0:00.64 apache2
19458 www-data 20 0 418m 14m 1872 S 1 0.4 0:01.06 apache2


mysql uses only 1% what can use other 99?

to release memory i must reboot computer.... restarting mysql or apache doesnt make effect


thanks