netdev - Re: [RFC PATCH]: Dynamically sized routing cache hash table.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 6 Mar 2007 15:18:09 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Robert Olsson <Robert.Olsson@...a.slu.se>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	robert.olsson@....uu.se, npiggin@...e.de
Subject: Re: [RFC PATCH]: Dynamically sized routing cache hash table.

On Tuesday 06 March 2007 14:42, Robert Olsson wrote:
> Eric Dumazet writes:
>  > Well, maybe... but after looking robert's trash, I discovered its model
>  > is essentially a big (2^18 slots) root node (our hash table), and very
>  > few order:1,2,3 nodes.
>
>  It's getting "hashlike" yes. I guess all effective algorithms today is
> doing some sort of "index" lookup and for large number of entries we cannot
> expect to find the next node in the same cache line so the "tree depth"
> becomes a crucial performance factor. IMO nothing can beat a prefect
> distributed and perfect sized hash. The trash work is an effort to get
> close with dynamic data structure.

Indeed. It would be nice to see how it performs with say 2^20 elements...
Because with your data, I wonder if the extra complexity of the trash is worth 
it (since most lookups are going to only hit the hash and give the answer 
without intermediate nodes)
-
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html