netdev - Re: [PATCH v2] RPS: Sparse connection optimizations

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Date:	Fri, 4 May 2012 11:39:39 +0800
From:	Deng-Cheng Zhu <dczhu@...s.com>
To:	Tom Herbert <therbert@...gle.com>
CC:	<davem@...emloft.net>, <netdev@...r.kernel.org>,
	<eric.dumazet@...il.com>
Subject: Re: [PATCH v2] RPS: Sparse connection optimizations - v2

On 05/04/2012 11:22 AM, Tom Herbert wrote:
>> +struct cpu_flow {
>> +       struct net_device *dev;
>> +       u32 rxhash;
>> +       unsigned long ts;
>> +};
>
> This seems like overkill, we already have the rps_flow_table and this
> used in accelerated RFS so the device can also take advantage of
> steering.  Maybe somehow program that table for your sparse flows?

In fact I did ever try something different in rps_flow_cnt (except for
rps_cpus, the only tunable thing relating to RPS in sysfs, am I missing
something?) and found no effect in my tests (iperf between 2 PCs via
Malta which works as router and uses iptables/NAT+RPS)...


Deng-Cheng
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