WordPress MU and memcached

Memcached plugin 2.0.1 can not work with WordPress MU 2.9.1.1.

I have an WordPress MU installation on my VPS. I am always looking for the way to improve the performance.
I found WordPress has a Memcached plugin here.
The WPMU I installed is the latest one, v2.9.1.1.
The Memcached plugin is v2.0.1.
Installation instruction said:

1. Install [memcached](http://danga.com/memcached) on at least one server. Note the connection info. The default is `127.0.0.1:11211`.
2. Install the [PECL memcached extension](http://pecl.php.net/package/memcache)
3. Copy object-cache.php to wp-content

I have memcached installed correctly, which I used for MovableType either.
I did copy object-cache.php to wp-content.
The problem is when I add a page in WordPress, it is not shown in the list of page links. The page is shown as usual.
I thought it is cache problem.


So, only memcached maybe. I removed object-cache.php. Everything is OK.
It means Memcached plugin 2.0.1 can not work with WordPress MU 2.9.1.1.

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