netdev - Re: [PATCH v2] Receive Packet Steering

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]

Message-Id: <20090716.194846.58845712.davem@davemloft.net>
Date:	Thu, 16 Jul 2009 19:48:46 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	therbert@...gle.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH v2] Receive Packet Steering

From: Tom Herbert <therbert@...gle.com>
Date: Tue, 14 Jul 2009 16:28:01 -0700

> Using the Toeplitz hash in steering lookup has given us about 10% more
> maximum pps (2 different NICs), and we haven't really noticed negative
> effects because of the extra descriptor overhead-- so I'm not going to
> give up on it too easily!

Do you have any idea why?  Does Toeplitz distribute better?
If so, that could be merely because either:

1) Our modulus avoidance scheme somehow decreases the distribution
   features of the hash

2) The way we feed data into the hash has a similar effect

It's worth checking out.

>> I had no choice, as I'm giving a presentation on this stuff tomorrow
>> night here in NYC :-)
> 
> Cool, do you happen to have slides.... :-)

I'll post them soon.
--
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