netdev - Re: [DCCP] [RFC] [Patchv2 1/1]: Queuing policies -- reworked version of Tomasz's patch set

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Date:	Fri, 25 Apr 2008 21:33:11 +0200
From:	Tomasz Grobelny <tomasz@...belny.oswiecenia.net>
To:	David Miller <davem@...emloft.net>
Cc:	gerrit@....abdn.ac.uk, dccp@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [DCCP] [RFC] [Patchv2 1/1]: Queuing policies -- reworked version of Tomasz's patch set

Dnia Wednesday 23 of April 2008, David Miller napisał:
> From: Gerrit Renker <gerrit@....abdn.ac.uk>
> Date: Tue, 22 Apr 2008 18:41:52 +0100
>
> > | If we iron this out we could finally return to the main subject of this
> > | thread. That is Patch v2 by me and Gerrit...
> > | --
> >
> > Fully agree - we just need to decide whether or not to use skb->priority.
> >
> > Below is as far as I got in integrating your patch last week, it shows
> > only the major changes. The following bits have been updated:
> >
> >  * skb->priority now cleared before passing the skb onto layer 3;
> >  * order of statements in prio_push() reversed (first dropping worst
> >    skb and then pushing the new skb - this is better when e.g.
> >    tx_qlen=1);
> >  * added general parsing routine for cmsg(3) socket control messages
> >    and defined one for the SOL_DCCP socket level; thanks to advice
> >    by Dave Miller
>
> If this usage of skb->priority is going to override the
> IP_TOS socket option setting, I don't think it's a good
> idea.
>
> Right now every packet output goes through ip_output.c
> which sets skb->priority to sk->sk_priority, which is set
> by the user via the IP_TOS socket option in ip_sockglue.c
> 
But I guess this assignment happens a bit later (that is after outgoing packet 
leaves DCCP code). Consequently using skb->priority should not harm as it 
will be overwritten. Or did I miss something?
-- 
Regards,
Tomasz Grobelny
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