netdev - Re: [PATCH net-next-2.6] inetpeer: lower false sharing effect

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Date:	Fri, 10 Jun 2011 10:05:31 -0700
From:	Tim Chen <tim.c.chen@...ux.intel.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>, Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH net-next-2.6] inetpeer: lower false sharing effect

On Fri, 2011-06-10 at 06:31 +0200, Eric Dumazet wrote:

> 
> Thanks Tim
> 
> I have some questions for further optimizations.
> 
> 1) How many different destinations are used in your stress load ?
> 2) Could you provide a distribution of the size of packet lengthes ?
>    Or maybe the average length would be OK
> 
> 
> 

Actually I have one load generator and one server connected to each
other via a 10Gb link.

The server is a 40 core 4 socket Westmere-EX machine and the load
generator is a 12 core 2 socket Westmere-EP machine.

There are 40 memcached daemons on the server each bound to a cpu core
and listening on a distinctive UDP port.  The load generator has 40
threads, with each thread sending memcache request to a particular UDP
port.

The load generator's memcache request packet has a UDP payload of 25
bytes.  The response packet from the daemon has a UDP payload of 13
bytes.

The UPD packets on the load generator and server are distributed across
16 Tx-Rx queues by hashing on the UDP ports (with slight modification of
the hash flags of ixgbe).

Thanks.

Tim

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