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From: David Miller <davem@davemloft.net>
Subject: Re: [TCP]: TCP_DEFER_ACCEPT causes leak sockets
Date: Tue, 17 Jun 2008 02:08:40 -0700 (PDT)
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From: Ingo Molnar <mingo@elte.hu>
Date: Tue, 17 Jun 2008 10:32:20 +0200

> those up to 1000 msec delays can be 'felt' via ssh too, if this problem 
> triggers then the system is almost unusable via the network. Local 
> latencies are perfect so it's an e1000 problem.

Or some kind of weird interrupt problem.

Such an interrupt level bug would also account for the TX timeout's
you're seeing btw.