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Re: [PATCH] Consolidate udp hash calculations [message #12669 is a reply to message #12632]

Mon, 07 May 2007 07:02

xemul
Messages: 248
Registered: November 2005

Senior Member

David Miller wrote:
> From: Pavel Emelianov <xemul@sw.ru>
> Date: Fri, 04 May 2007 18:51:36 +0400
>
>> Make access to udphash/udplitehash symmetrical to inet hashes.
>>
>> This may also help network namespaces, since they tend to use
>> one hash for different namespaces by selecting the hash chain
>> depending on a hash value and the namespace.
>>
>> Signed-off-by: Pavel Emelianov <xemul@openvz.org>
>
> This is not the "UDP Hash Function", it is a mask to bring
> the hash value modulo of the hash table size.
>
> So your function name is misleading and makes the code
> even worse.
>
> I'm also not so sure this cleanup really adds any clarity,
> even with a proper function name.

The same is applicable to inet_lhashfn and inet_bhashfn, but they
are called hashfn-s and do exist in kernel. This hashfn will make
things look similar.

> I can only assume you wish to do something with the UDP hash table
> sizes, and therefore only want to have a need to touch one function.

You are right, I have told that this must help network namespaces,
by making the hash differ depending on the namespace passed.

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[Message index]

		[PATCH] Consolidate udp hash calculations By: xemul on Fri, 04 May 2007 14:47
		Re: [PATCH] Consolidate udp hash calculations By: davem on Fri, 04 May 2007 19:39
		Re: [PATCH] Consolidate udp hash calculations By: xemul on Mon, 07 May 2007 07:02
		Re: [PATCH] Consolidate udp hash calculations By: davem on Mon, 07 May 2007 07:04

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