netdev - Re: small RPS cache for fragments?

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Message-Id: <20110517.172855.2016870292390364232.davem@davemloft.net>
Date:	Tue, 17 May 2011 17:28:55 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	therbert@...gle.com
Cc:	netdev@...r.kernel.org
Subject: Re: small RPS cache for fragments?

From: Tom Herbert <therbert@...gle.com>
Date: Tue, 17 May 2011 14:27:10 -0700

>> 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.
>>
> I remember observing this a while back, what's the rationale for it?

That's the cheapest way to build the fragments.

Regardless of the reason we have to handle it forever.
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