From: David Miller <davem@davemloft.net>
To: ebiederm@xmission.com
Cc: bcrl@kvack.org, linux-kernel@vger.kernel.org,
torvalds@linux-foundation.org
Subject: Re: regression: sysctl_check changes in 2.6.24 are O(n) resulting in slow creation of 10000 network interfaces
Date: Sun, 06 Jan 2008 23:10:40 -0800 (PST) [thread overview]
Message-ID: <20080106.231040.222338659.davem@davemloft.net> (raw)
In-Reply-To: <m1ir26ktqi.fsf@ebiederm.dsl.xmission.com>
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.
next prev parent reply other threads:[~2008-01-07 7:10 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-06 22:03 Benjamin LaHaise
2008-01-07 6:57 ` Eric W. Biederman
2008-01-07 7:10 ` David Miller [this message]
2008-01-07 10:25 ` Eric W. Biederman
2008-01-08 1:47 ` Benjamin LaHaise
2008-01-07 20:45 ` Andi Kleen
2008-01-07 21:30 ` Alan Cox
2008-01-07 22:57 ` Andi Kleen
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