netdev - Re: Multicast packet loss

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Message-ID: <49BAE1F3.5020105@cosmosbay.com>
Date:	Fri, 13 Mar 2009 23:45:07 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	David Miller <davem@...emloft.net>
CC:	kchang@...enacr.com, netdev@...r.kernel.org,
	cl@...ux-foundation.org, bmb@...enacr.com
Subject: Re: Multicast packet loss

David Miller a écrit :
> From: Eric Dumazet <dada1@...mosbay.com>
> Date: Fri, 13 Mar 2009 23:30:31 +0100
> 
>> David Miller a écrit :
>>>> Also, when an event was queued for later invocation, I also needed to keep
>>>> a reference on "struct socket" to make sure it doesnt disappear before
>>>> the invocation. Not all sockets are RCU guarded (we added RCU only for 
>>>> some protocols (TCP, UDP ...). So I found keeping a read_lock
>>>> on callback was the easyest thing to do. I now realize we might
>>>> overflow preempt_count, so special care is needed.
>>> You're using this in UDP so... make the rule that you can't use
>>> this with a non-RCU-quiescent protocol.
>> UDP/TCP only ? I though many other protocols (not all using RCU) were
>> using sock_def_readable() too...
> 
> Maybe create a inet_def_readable() just for this purpose :-)

I must be tired, I should had this idea before you :)

I post a new patch after some rest, I definitly should not be still awake !


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