netdev - Re: [Pv-drivers] rps and pvdrivers

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Message-ID: <1283583652.3402.2.camel@edumazet-laptop>
Date:	Sat, 04 Sep 2010 09:00:52 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Chetan Loke <chetanloke@...il.com>,
	Tom Herbert <therbert@...gle.com>
Cc:	Bhavesh Davda <bhavesh@...are.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"pv-drivers@...are.com" <pv-drivers@...are.com>
Subject: Re: [Pv-drivers] rps and pvdrivers

Le samedi 04 septembre 2010 à 08:51 +0200, Eric Dumazet a écrit :
> > 
> 
> Reproduce what exactly ? 
> 
> I dont understand what the problem is, reading your description.
> 
> RPS is not automatically switched on, you have to configure it.
> 
> echo ffff >/sys/class/net/eth0/queues/rx-0/rps_cpus
> 
> Same for RFS if you prefer to use RFS
> 
> echo 16384 >/sys/class/net/eth0/queues/rx-0/rps_flow_cnt
> 

And, before you try this, you probably also need

echo 16384 >/proc/sys/net/core/rps_sock_flow_entries

Tom, I believe you were about to add RPS documentation in
Documentation/ ?


> If you receive a flood, your cpu stay in NAPI mode, and no hardware
> interrupt is received while you process xxx.xxx packets per second.
> 
> 


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