freebsd stable - Jan 2008 - Strange top output

Hello all
i have a running 6.2 server with 2 jails 1 proxy and one for mailscanning with
mailscanner and mailwatch

if i log in on the mailscanner and do top i see normal numbers.

now i have installed 7.0rc1 amd64 version on a quad core xeon and updated
yesterday my src and did a buildworld cycle
On this machine i am running the same jails 1 for proxy and one for the
mailscanning.
but if i do i top here i see much higher values of size used

last pid:  3132;  load averages:  0.15,  0.12,  0.07    up 0+00:31:22  21:39:58
48 processes:  1 running, 47 sleeping
CPU states:  0.0% user,  0.0% nice,  0.0% system,  0.0% interrupt,  100% idle
Mem: 521M Active, 39M Inact, 148M Wired, 460K Cache, 113M Buf, 3227M Free
Swap: 4096M Total, 4096M Free

  PID USERNAME  THR PRI NICE   SIZE    RES STATE  C   TIME   WCPU COMMAND
 3117 postfix     1   8    0   141M   101M nanslp 2   0:03  0.00% perl
 3114 postfix     1   8    0   141M   101M nanslp 3   0:03  0.00% perl
 3111 postfix     1   8    0   141M   101M nanslp 3   0:02  0.00% perl
 3108 postfix     1   8    0   141M   101M nanslp 3   0:02  0.00% perl
 3104 postfix     1   8    0   141M   101M nanslp 0   0:02  0.00% perl
 2601 postfix     1   4    0 61144K 49544K accept 1   0:02  0.00% clamd
 2772 www         1   4    0   133M 19296K accept 2   0:00  0.00% httpd
 2736 root        1  44    0   132M 16828K select 1   0:00  0.00% httpd
 2727 www         1   8    0 24324K  7536K nanslp 0   0:00  0.00% perl
 2773 www         1   4    0   133M 19284K accept 1   0:00  0.00% httpd
 2774 www         1   4    0   133M 19276K accept 2   0:00  0.00% httpd
 2776 www         1   4    0   133M 19276K accept 2   0:00  0.00% httpd
 3010 www         1   4    0   133M 19276K accept 2   0:00  0.00% httpd
 2906 mysql      15   4    0 72496K 25464K sbwait 2   0:00  0.00% mysqld
 2800 beheer      1  44    0 32800K  4484K select 0   0:00  0.00% sshd
 2606 postfix     1  20    0 13936K  2572K pause  3   0:00  0.00% freshclam


like the http deamon 133M and the postfix (mailscanner) of 141M 
on the 6.2 it is around 
11862 postfix     1   8    0 92140K 82340K nanslp   0:11  0.00% perl
11944 postfix     1   8    0 92120K 82112K nanslp   0:09  0.00% perl
16879 postfix     1   8    0 91736K 83812K nanslp   0:09  0.00% perl
11994 postfix     1   8    0 91808K 83788K nanslp   0:09  0.00% perl
92322 postfix     1   8    0 91752K 83864K nanslp   0:09  0.00% perl
859 www         1   4    0 21704K 12920K accept   0:00  0.00% httpd
857 www         1   4    0 21132K 12348K accept   0:00  0.00% httpd
861 www         1   4    0 21704K 12856K accept   0:00  0.00% httpd

did i do something wrong or is it something else!

this is my first amd64 install, the 6.2 is a i386 install

regards,
Johan

Johan Hendriks wrote:
> now i have installed 7.0rc1 amd64 version on a quad core xeon and updated
yesterday my src and did a buildworld cycle
> On this machine i am running the same jails 1 for proxy and one for the
mailscanning.
> but if i do i top here i see much higher values of size used
> this is my first amd64 install, the 6.2 is a i386 install
There are two reasons for the behaviour you noticed:

a) 64-bit software takes more memory than 32-bit, by definition 
(pointers are twice the size, etc.)
b) The memory allocator (malloc) was completely changed in 7.0, and it 
requests more memory from the kernel than the one used before (don't 
worry: the amount of memory actually _used_ has nothing to do with how 
much virtual memory is allocated).

In your case, these two factors have increased memory usage from 82 MB 
to 110 MB, and allocation from 92 MB to 141 MB. There's nothing bad 
here, if you have enough memory.

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