From: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
To: David Miller <davem@davemloft.net>
Cc: rick.jones2@hp.com, netdev@vger.kernel.org
Subject: Re: Netperf TCP_RR(loopback) 10% regression in 2.6.24-rc6, comparing with 2.6.22
Date: Tue, 22 Jan 2008 14:51:04 +0800 [thread overview]
Message-ID: <1200984664.3151.253.camel@ymzhang> (raw)
In-Reply-To: <20080121.222214.184161381.davem@davemloft.net>
On Mon, 2008-01-21 at 22:22 -0800, David Miller wrote:
> From: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
> Date: Tue, 22 Jan 2008 14:07:19 +0800
>
> > I am wondering if UDP stack in kernel has a bug.
>
> If one server binds to INADDR_ANY with port N, then any other socket
> can be bound to a specific IP address with port N. When packets
> come in destined for port N, the delivery will be prioritized
> to whichever socket has the more specific and matching binding.
What does 'more specific' mean here? I assume 127.0.0.1 should be
prioritized before 0.0.0.0 which means packets should be queued to
127.0.0.1 firstly.
>
> So the kernel is fine.
But kernel now queues packets to 0.0.0.0.
>
> Netperf just needs to be more careful in order to handle this kind of
> case more cleanly.
It's better if kernel works more reasonable.
-yanmin
next prev parent reply other threads:[~2008-01-22 6:53 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-09 9:35 Netperf TCP_RR(loopback) 10% regression in 2.6.24-rc6, comparing with 2.6.22 Zhang, Yanmin
2008-01-09 11:48 ` David Miller
2008-01-11 9:30 ` Zhang, Yanmin
2008-01-11 17:56 ` Rick Jones
2008-01-14 3:11 ` Zhang, Yanmin
2008-01-14 17:46 ` Rick Jones
2008-01-22 5:24 ` Zhang, Yanmin
2008-01-22 6:07 ` Zhang, Yanmin
2008-01-22 6:22 ` David Miller
2008-01-22 6:51 ` Zhang, Yanmin [this message]
2008-01-22 7:13 ` Eric Dumazet
2008-01-22 6:27 ` Eric Dumazet
2008-01-22 6:52 ` Zhang, Yanmin
2008-01-22 7:32 ` David Miller
2008-01-22 18:36 ` Rick Jones
2008-01-23 0:42 ` Zhang, Yanmin
2008-01-23 3:25 ` Zhang, Yanmin
2008-01-14 8:44 ` Ilpo Järvinen
2008-01-14 9:21 ` Ilpo Järvinen
2008-01-14 9:38 ` Zhang, Yanmin
2008-01-14 10:53 ` Herbert Xu
2008-01-16 0:34 ` Zhang, Yanmin
2008-01-16 7:15 ` Zhang, Yanmin
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