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From: David Miller <davem@davemloft.net>
Subject: Re: [RFC] tcp: use order-3 pages in tcp_sendmsg()
Date: Thu, 20 Sep 2012 15:40:07 -0400 (EDT)
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From: Rick Jones <rick.jones2@hp.com>
Date: Thu, 20 Sep 2012 10:10:43 -0700

> On 09/19/2012 10:37 PM, Eric Dumazet wrote:
>> loopback is lossless, so its always surprising we can have TCP
>> retransmits on this medium ;)
> 
> Is it lossless?
> 
> raj@tardy:~/netperf2_trunk$ netstat -s | grep pru
>     19 packets pruned from receive queue because of socket buffer overrun

Those packets are not being dropped by the loopback device.