From: Benjamin LaHaise <bcrl@kvack.org>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: linux-kernel@vger.kernel.org, torvalds@linux-foundation.org,
David Miller <davem@davemloft.net>
Subject: Re: regression: sysctl_check changes in 2.6.24 are O(n) resulting in slow creation of 10000 network interfaces
Date: Mon, 7 Jan 2008 20:47:01 -0500 [thread overview]
Message-ID: <20080108014701.GI28570@kvack.org> (raw)
In-Reply-To: <m1tzlqj5kz.fsf@ebiederm.dsl.xmission.com>
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
next prev parent reply other threads:[~2008-01-08 1:47 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-06 22:03 regression: sysctl_check changes in 2.6.24 are O(n) resulting in slow creation of 10000 network interfaces Benjamin LaHaise
2008-01-07 6:57 ` Eric W. Biederman
2008-01-07 7:10 ` David Miller
2008-01-07 10:25 ` Eric W. Biederman
2008-01-08 1:47 ` Benjamin LaHaise [this message]
2008-01-07 20:45 ` Andi Kleen
2008-01-07 21:30 ` Alan Cox
2008-01-07 22:57 ` Andi Kleen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20080108014701.GI28570@kvack.org \
--to=bcrl@kvack.org \
--cc=davem@davemloft.net \
--cc=ebiederm@xmission.com \
--cc=linux-kernel@vger.kernel.org \
--cc=torvalds@linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox