Recently I've switched from ubuntu 32bit to 64bit version. And now I experiencing some problems.

All application take twice more memory. And some application takes even more. For example sshd on new server:

root      6608  0.0  0.0  67972  2912 ?        Ss   14:43   0:00 sshd: deploy [priv]
deploy    6616  0.0  0.0  67972  1724 ?        S    14:43   0:00 sshd: deploy@pts/4
root     20892  0.0  0.0  50916  1160 ?        Ss   15:53   0:00 /usr/sbin/sshd
root     21170  0.0  0.0  67972  2912 ?        Ss   15:56   0:00 sshd: deploy [priv]
deploy   21173  0.0  0.0  67972  1728 ?        S    15:56   0:00 sshd: deploy@pts/0
root     23802  0.0  0.0  67972  2912 ?        Ss   16:08   0:00 sshd: deploy [priv]
deploy   23804  0.0  0.0  67972  1724 ?        S    16:08   0:00 sshd: deploy@pts/1
root     24570  0.0  0.0  67972  2908 ?        Ss   12:45   0:00 sshd: deploy [priv]
deploy   24573  0.0  0.0  68112  1804 ?        S    12:45   0:00 sshd: deploy@pts/3
deploy   25014  0.0  0.0   5168   852 pts/0    S+   16:13   0:00 grep ssh

the same on the old server:

root      4867  0.0  0.0   5312  1028 ?        Ss   Mar23   0:00 /usr/sbin/sshd
root     23753  0.0  0.0   8052  2556 ?        Ss   16:15   0:00 sshd: deploy [priv]
deploy   23755  0.0  0.0   8052  1524 ?        S    16:15   0:00 sshd: deploy@pts/0
deploy   23770  0.0  0.0   3004   748 pts/0    D+   16:15   0:00 grep ssh

The same problems with postfix, nginx and some other application.