Subject: Re: BUG: aim7/specjbb2005/fio hang due to commit:
 597a264b1a9c7e36d1728f
From: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
To: "Alex,Shi" <alex.shi@intel.com>
Cc: john.r.fastabend@intel.com, davem@davemloft.net, yanmin.zhang@intel.com,
       tim.c.chen@intel.com, linux-kernel@vger.kernel.org
In-Reply-To: <1276409640.9452.49.camel@debian>
References: <1276409640.9452.49.camel@debian>
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Date: Sun, 13 Jun 2010 16:16:56 +0800
Message-Id: <1276417016.2096.467.camel@ymzhang.sh.intel.com>
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On Sun, 2010-06-13 at 14:14 +0800, Alex,Shi wrote:
> The listed benchmark using loopback mode netio and all hang in 35-rc3
> testing. Yanmin and I found it is due to the commit
> 597a264b1a9c7e36d1728f677c66c5c1f7e3b837.
All these benchmark stops at network io reading to wait for data.

>  
> After revert this patch, all benchmarks can be recovered. Seems the
> following line is the suspicious. 
> 
> 
> 
> +       /*
> +        * bonding note: skbs received on inactive slaves should only
> +        * be delivered to pkt handlers that are exact matches.  Also
> +        * the deliver_no_wcard flag will be set.  If packet handlers
> +        * are sensitive to duplicate packets these skbs will need to
> +        * be dropped at the handler.  The vlan accel path may have
> +        * already set the deliver_no_wcard flag.
> +        */
>         null_or_orig = NULL;
>         orig_dev = skb->dev;
>         master = ACCESS_ONCE(orig_dev->master);
> -       if (master) {
> -               if (skb_bond_should_drop(skb, master))
> +       if (skb->deliver_no_wcard)
> +               null_or_orig = orig_dev;
> +       else if (master) {
> +               if (skb_bond_should_drop(skb, master)) {
> +                       skb->deliver_no_wcard = 1;
>                         null_or_orig = orig_dev; /* deliver only exact
> match */
> -               else
> +               } else
>                         skb->dev = master;
>         }
> 
> Thanks
> Alex 
> 
> --
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