From: David Lebrun <david.lebrun@uclouvain.be>
To: David Miller <davem@davemloft.net>
Cc: <netdev@vger.kernel.org>
Subject: Re: [RFC PATCH net-next] ipv6: implement consistent hashing for equal-cost multipath routing
Date: Mon, 28 Nov 2016 21:58:49 +0100 [thread overview]
Message-ID: <583C9A89.4060404@uclouvain.be> (raw)
In-Reply-To: <20161128.153209.2135257061368558724.davem@davemloft.net>
[-- Attachment #1: Type: text/plain, Size: 635 bytes --]
On 11/28/2016 09:32 PM, David Miller wrote:
> When I was working on the routing cache removal in ipv4 I compared
> using a stupid O(1) hash lookup of the FIB entries vs. the O(log n)
> fib_trie stuff actually in use.
>
> It did make a difference.
>
> This is a lookup that can be invoked 20 million times per second or
> more.
>
> Every cycle matters.
>
> We already have a lot of trouble getting under the cycle budget one
> has for routing at wire speed for very high link rates, please don't
> make it worse.
OK, so O(1) mandatory. I will continue in that direction then.
Thanks for the feedback
David
[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 163 bytes --]
next prev parent reply other threads:[~2016-11-28 20:58 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-24 19:59 [RFC PATCH net-next] ipv6: implement consistent hashing for equal-cost multipath routing David Lebrun
2016-11-28 16:22 ` David Miller
2016-11-28 20:16 ` David Lebrun
2016-11-28 20:32 ` David Miller
2016-11-28 20:58 ` David Lebrun [this message]
2016-11-30 13:12 ` Hannes Frederic Sowa
2016-12-01 20:26 ` David Miller
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=583C9A89.4060404@uclouvain.be \
--to=david.lebrun@uclouvain.be \
--cc=davem@davemloft.net \
--cc=netdev@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).