Description:
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As mentionned in the doc, the config parameter for APC shared memory segments size is an integer and should be an integer. It's clearly noticed that the value is meant in MB.

Some distributions of Debian does not handle config if defined as following :
apc.shm_size=256M

The trailing "M" for megabyte is not understood and the config fallbacks on default. So it needs tobe defined as following :
apc.shm_size=256

The matter is that default value in the doc is "32M". In order to avoid some misconfigurations, I think that default value in the doc should be given as "32", without the trailing "M".