# Re: \[PATCH\] net: dev: fix the incorrect hold of net namespace's lo device

- From: Eric Dumazet \<hidden\>
- Date: 2012-08-23 03:13:14 
- List: netdev
- Page: https://ratatoskr.run/netdev/2012/08/10902371
- Thread: https://ratatoskr.run/netdev/2012/08/10902267/t.md

```text
On Wed, 2012-08-22 at 10:39 +0200, Eric Dumazet wrote:

> rcu_barrier() at this place will kill some workloads.

For example, I tested the following one :

modprobe dummy numdummies=1000
time rmmod dummy

-> 16.5 seconds instead of 0.4 second
```