Re: regression: sysctl_check changes in 2.6.24 are O(n) resulting in slow creation of 10000 network interfaces

David Miller
2008-01-07T07:10:50Z

From: ebiederm@xmission.com (Eric W. Biederman)
Date: Sun, 06 Jan 2008 23:57:57 -0700

> Why do we need 10000 interfaces? Why isn't network device creation a
> slow path?

Because people create virtual devices like mad.

> So is this a bug report telling me that there are users with
> 10k or 100k interfaces that care. So we need to fix sysctl.

Unquestionably, we do, it's a major regression.

People create thousands of VLAN devices, as one of many examples, all
the time.

That's why we even bother hashing network devices in the network code.