PHP memory limit upper bound?

[grigor@gatchev.info]

Hi all,

I need to set the PHP memory limit to more than 512 MB and found that I
can't. Is this caused by the Suhosin patch (my guess), and how to get
around it?

(I tried to set suhosin.memory_limit to 1024M: no change. Was told that
php5-suhosin might be more configurable, but it breaks some package
dependencies, and I can't afford this easily.)

Debian Sid, amd64, php5-common 5.6.0+dfsg-1+b1. If you need more info,
please don't hesitate to ask.

Thanks in advance,

Grigor