memchache memory leak?

[zaaas zaaas]

why used my memcached server 177160K of memory? If have limited the memory
to -m 128 megabyte

Thanks for helping!

ps aux|grep mem
nobody    7117  0.3  3.4 177160 71228 ?        Ss   Jan10  36:05
/usr/local/bin/memcached -d -m 128 -l <IP> -p 12221 -u nobody -c 5000