From: David Miller <davem@davemloft.net>
To: therbert@google.com
Cc: netdev@vger.kernel.org
Subject: Re: [PATCH v2] Receive Packet Steering
Date: Thu, 16 Jul 2009 19:48:46 -0700 (PDT) [thread overview]
Message-ID: <20090716.194846.58845712.davem@davemloft.net> (raw)
In-Reply-To: <65634d660907141628g671812f9t4219cc8b6a493425@mail.gmail.com>
From: Tom Herbert <therbert@google.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.
next prev parent reply other threads:[~2009-07-17 2:48 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-04 4:03 [PATCH v2] Receive Packet Steering Tom Herbert
2009-05-04 5:30 ` Eric Dumazet
2009-05-04 6:10 ` Eric Dumazet
2009-05-04 7:13 ` Eric Dumazet
2009-05-12 17:28 ` Tom Herbert
2009-05-04 7:08 ` Eric Dumazet
2009-05-04 7:59 ` Andi Kleen
2009-05-04 18:22 ` Jarek Poplawski
2009-05-04 20:43 ` Jarek Poplawski
2009-06-10 8:23 ` David Miller
2009-06-15 5:54 ` Tom Herbert
[not found] ` <65634d660906142252y6f7fc021l844b172995c10044@mail.gmail.com>
2009-06-15 9:02 ` David Miller
2009-06-15 16:39 ` Tom Herbert
2009-06-15 23:18 ` David Miller
2009-07-13 17:49 ` David Miller
2009-07-13 22:04 ` Tom Herbert
2009-07-14 19:33 ` David Miller
2009-07-14 23:28 ` Tom Herbert
2009-07-17 2:48 ` David Miller [this message]
2009-07-17 18:05 ` Tom Herbert
2009-07-17 18:08 ` David Miller
2009-07-17 19:59 ` Tom Herbert
2009-07-18 3:54 ` David Miller
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