netdev - Re: [PATCH v2 net-next 3/3] rhashtable: Add scored lookups

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Message-ID: <CALx6S37ce-WF922inJ=JsUEFWL5UiT2=qqDC3UqVGtPFUnpJ+w@mail.gmail.com>
Date:	Tue, 14 Jul 2015 17:25:33 -0700
From:	Tom Herbert <tom@...bertland.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Thomas Graf <tgraf@...g.ch>, Kernel Team <kernel-team@...com>
Subject: Re: [PATCH v2 net-next 3/3] rhashtable: Add scored lookups

On Tue, Jul 14, 2015 at 5:18 PM, Herbert Xu <herbert@...dor.apana.org.au> wrote:
> On Tue, Jul 14, 2015 at 04:45:49PM -0700, Tom Herbert wrote:
>>
>> +             } else if (score == best_score) {
>> +                     matches++;
>> +                     if (reciprocal_scale(khash, matches) == 0)
>> +                             result = he;
>> +                     khash = next_pseudo_random32(khash);
>> +             }
>
> Note that during a rehash you can encounter the same object multiple
> times, does this logic still work in that case?
>
I would think. The property being supported here is uniform
distribution, *not* consistency.

Tom

> Cheers,
> --
> Email: Herbert Xu <herbert@...dor.apana.org.au>
> Home Page: http://gondor.apana.org.au/~herbert/
> PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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