netdev - Re: [RFC] ipv4: Do not cache routing failures due to disabled forwarding.

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Message-ID: <54143FB2.9000600@green-communications.fr>
Date:	Sat, 13 Sep 2014 14:59:30 +0200
From:	Nicolas Cavallari <nicolas.cavallari@...en-communications.fr>
To:	netdev@...r.kernel.org
Subject: Re: [RFC] ipv4: Do not cache routing failures due to disabled forwarding.

[Resending to netdev instead of linux-netdev, sorry again.]

For whatever reason, I didn't receive your reply and I'm not subscribed
to the list but I saw it on archives.

> 	Two alternatives are possible:
> 
> 1. set res.fi = NULL after 'no_route:' label
> 
> or better
> 
> 2. set do_cache = false after 'no_route:' label,
> then instead of 'goto local_input;' jump to a new
> label 'create_rt:' just before rt_dst_alloc.
> 
> 	Not sure, they may generate less code in the fast path.

If I implement the first alternative, GCC will optimize it to the
second. And it does not do that same optimization with my patch...

Will submit alternative 1 if there are no further issues/comments.
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