netdev - Re: TCP connection stops after high load.

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Message-Id: <20070413.223739.27452745.davem@davemloft.net>
Date:	Fri, 13 Apr 2007 22:37:39 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	dada1@...mosbay.com
Cc:	herbert@...dor.apana.org.au, danielschaffrath@....com,
	greearb@...delatech.com, andi@...stfloor.org,
	netdev@...r.kernel.org, bcrl@...ck.org
Subject: Re: TCP connection stops after high load.

From: Eric Dumazet <dada1@...mosbay.com>
Date: Sat, 14 Apr 2007 07:31:35 +0200

> When did tg3 model changed exactly ?

June of 2006:

commit 00b7050426da8e7e58c889c5c80a19920d2d41b3
Author: Michael Chan <mchan@...adcom.com>
Date:   Sat Jun 17 21:58:45 2006 -0700

    [TG3]: Convert to non-LLTX
    
    Herbert Xu pointed out that it is unsafe to call netif_tx_disable()
    from LLTX drivers because it uses dev->xmit_lock to synchronize
    whereas LLTX drivers use private locks.
    
    Convert tg3 to non-LLTX to fix this issue. tg3 is a lockless driver
    where hard_start_xmit and tx completion handling can run concurrently
    under normal conditions. A tx_lock is only needed to prevent
    netif_stop_queue and netif_wake_queue race condtions when the queue
    is full.
    
    So whether we use LLTX or non-LLTX, it makes practically no
    difference.
    
    Signed-off-by: Michael Chan <mchan@...adcom.com>
    Signed-off-by: David S. Miller <davem@...emloft.net>
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