netdev - Re: TCP connection stops after high load.

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Message-Id: <20070413.212523.98702742.davem@davemloft.net>
Date:	Fri, 13 Apr 2007 21:25:23 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	dada1@...mosbay.com, danielschaffrath@....com,
	greearb@...delatech.com, andi@...stfloor.org,
	netdev@...r.kernel.org, bcrl@...ck.org
Subject: Re: TCP connection stops after high load.

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Sat, 14 Apr 2007 14:21:44 +1000

> Eric Dumazet <dada1@...mosbay.com> wrote:
> > 
> > dev_queue_xmit_nit() is called before attempting to send packet to device.
> > 
> > If device could not accept the packet (hard_start_xmit() returns an error), packet is requeued and retried later.
> > each retry means call ev_queue_xmit_nit() again, so tcpdump/sniffers can 'see' packet transmited several times. 
> 
> This should only happen with LLTX drivers.  In fact, LLTX drivers are
> really more trouble than they're worth.  They should all be rewritten
> to follow the model used in tg3.

Agreed.
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