netdev - Re: small RPS cache for fragments?

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Message-ID: <1305666050.2691.4.camel@edumazet-laptop>
Date:	Tue, 17 May 2011 23:00:50 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	therbert@...gle.com, netdev@...r.kernel.org
Subject: Re: small RPS cache for fragments?

Le mardi 17 mai 2011 à 16:49 -0400, David Miller a écrit :
> From: Tom Herbert <therbert@...gle.com>
> Date: Tue, 17 May 2011 13:02:25 -0700
> 
> > I like it!  And this sounds like the sort of algorithm that NICs might
> > be able to implement to solve the UDP/RSS unpleasantness, so even
> > better.
> 
> Actually, I think it won't work.  Even Linux emits fragments last to
> first, so we won't see the UDP header until the last packet where it's
> no longer useful.
> 
> Back to the drawing board. :-/

Well, we could just use the iph->id in the rxhash computation for frags.

At least all frags of a given datagram should be reassembled on same
cpu, so we get RPS (but not RFS)



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