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

Benjamin LaHaise
2008-01-08T01:47:23Z

On Mon, Jan 07, 2008 at 03:25:00AM -0700, Eric W. Biederman wrote:
> I think someone failed to notice that using /proc/sys slowed to a crawl
> in that event, and now that I am doing a lookup on register it seems to
> showing up in the benchmarks.

The directory that is problematic rarely gets accessed. Fixing sysfs
properly at some point would be a good idea, it's just one of those things
that isn't quite high priority yet.

> Benjamin can you test the patch below and tell me if it also
> keeps the network device performance at acceptable levels.

I can confirm that this patch does indeed put the regression at bay for
now.

-ben