php5-cgi huge memory usage

[bleed]

I'm using ispCP for 3 month now.
At first I didn't noticed, but now (for about month) php5-cgi processes ar using a lot of memory:

Code:

29329    vu2080    230356 kB    /usr/bin/php5-cgi
29195    vu2034    230284 kB    /usr/bin/php5-cgi
29340    vu2089    229840 kB    /usr/bin/php5-cgi
29330    vu2080    229632 kB    /usr/bin/php5-cgi
29320    vu2079    229336 kB    /usr/bin/php5-cgi
29321    vu2079    229120 kB    /usr/bin/php5-cgi
29191    vu2034    225880 kB    /usr/bin/php5-cgi
29338    vu2089    225880 kB    /usr/bin/php5-cgi
29341    vu2089    225880 kB    /usr/bin/php5-cgi
29324    vu2080    225436 kB    /usr/bin/php5-cgi
29336    vu2010    225396 kB    /usr/bin/php5-cgi
29337    vu2010    225352 kB    /usr/bin/php5-cgi
29314    vu2079    224912 kB    /usr/bin/php5-cgi
29334    vu2010    224912 kB    /usr/bin/php5-cgi
29316    vu2126    167644 kB    /usr/bin/php5-cgi
29308    vu2143    165820 kB    /usr/bin/php5-cgi
29309    vu2143    165568 kB    /usr/bin/php5-cgi
29357    vu2079    165424 kB    /usr/bin/php5-cgi
29315    vu2126    165148 kB    /usr/bin/php5-cgi
29389    vu2145    163764 kB    /usr/bin/php5-cgi
29388    vu2145    163644 kB    /usr/bin/php5-cgi
29318    vu2081    163472 kB    /usr/bin/php5-cgi
29319    vu2081    163472 kB    /usr/bin/php5-cgi
29356    vu2079    163160 kB    /usr/bin/php5-cgi
29347    vu2036    163112 kB    /usr/bin/php5-cgi
20179    vu2000    163108 kB    /usr/bin/php5-cgi
29346    vu2036    163104 kB    /usr/bin/php5-cgi
20191    vu2000    162580 kB    /usr/bin/php5-cgi
29353    vu2080    161968 kB    /usr/bin/php5-cgi
29327    vu2005    161072 kB    /usr/bin/php5-cgi
29328    vu2005    161072 kB    /usr/bin/php5-cgi
29352    vu2080    161020 kB    /usr/bin/php5-cgi
29306    vu2143    160344 kB    /usr/bin/php5-cgi
29310    vu2126    160344 kB    /usr/bin/php5-cgi
29312    vu2081    160344 kB    /usr/bin/php5-cgi
29323    vu2005    160344 kB    /usr/bin/php5-cgi
29342    vu2090    160344 kB    /usr/bin/php5-cgi
29343    vu2036    160344 kB    /usr/bin/php5-cgi
29350    vu2080    160344 kB    /usr/bin/php5-cgi
29354    vu2079    160344 kB    /usr/bin/php5-cgi
29378    vu2145    160344 kB    /usr/bin/php5-cgi
29387    vu2001    160344 kB    /usr/bin/php5-cgi
29404    vu2001    160344 kB    /usr/bin/php5-cgi
29406    vu2001    160344 kB    /usr/bin/php5-cgi
29538    vu2115    160344 kB    /usr/bin/php5-cgi
29540    vu2115    160344 kB    /usr/bin/php5-cgi
29541    vu2115    160344 kB    /usr/bin/php5-cgi
32277    vu2000    160344 kB    /usr/bin/php5-cgi

I think it's way too much.

I'm running on Ubuntu Linux 9.10
Linux 2.6.31-22-generic on x86_64
AMD Phenom™ II X6 1055T Processor, 6 cores, 4GB of RAM
using latest ispCP Omega 1.0.6

I tried to change some apache2 configuration, but finally came back to default.
If needed some specific configuration details - just ask!

What might it be? Some kind of bug or just because of my "knowledge" of linux and running servers?