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

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Message-ID: <20080108014701.GI28570@kvack.org>
Date:	Mon, 7 Jan 2008 20:47:01 -0500
From:	Benjamin LaHaise <bcrl@...ck.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	David Miller <davem@...emloft.net>
Subject: Re: regression: sysctl_check changes in 2.6.24 are O(n) resulting in slow creation of 10000 network interfaces

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
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