netdev - Re: [PATCH v2] Receive Packet Steering

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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.
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