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From: David Miller <davem@davemloft.net>
To: dhananjay@netxen.com
Cc: netdev@vger.kernel.org
Subject: Re: [patch next 4/4] netxen: disable rss for GbE ports
Date: Wed, 06 May 2009 16:31:42 -0700 (PDT)	[thread overview]
Message-ID: <20090506.163142.112368323.davem@davemloft.net> (raw)
In-Reply-To: <4A0217F6.7060005@netxen.com>

From: Dhananjay Phadke <dhananjay@netxen.com>
Date: Wed, 6 May 2009 16:06:30 -0700

> The reason for RSS was to distribute the ingress traffic
> to different CPUs. At 10Gbps, without RSS, one CPU was
> saturating, acting as bottleneck. I can do 1Gbps with
> only one CPU only 50% saturated, this to on a low end
> server.
> 
> The fallout is more msix vectors being consumed for RSS,
> when they don't really bring any performance gain.
> 
> Since NetXen has single driver, unlike others, it needs
> to be dealt based on NIC board type.

Thanks for ignoring my email.

I'll say it again, maybe you'll listen this time.

If a user has very cpu intensive netfilter or routing
rules installed, the RSS flow seperation to different
CPUs can help even at 1GB speeds.

Therefore, your change will introduce performance regressions.

  reply	other threads:[~2009-05-06 23:31 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-05-06  5:05 [patch next 0/4] netxen fixes Dhananjay Phadke
2009-05-06  5:05 ` [patch next 1/4] netxen: fix race in tx ring acccess Dhananjay Phadke
2009-05-06 22:35   ` David Miller
2009-05-06  5:05 ` [patch next 2/4] netxen: fix mac list management Dhananjay Phadke
2009-05-06 22:35   ` David Miller
2009-05-06  5:05 ` [patch next 3/4] netxen: fix bonding support Dhananjay Phadke
2009-05-06 22:35   ` David Miller
2009-10-23  5:57   ` Eric W. Biederman
2009-10-24  1:54     ` Dhananjay Phadke
2009-10-24  2:13       ` Eric W. Biederman
2009-10-24 17:29         ` Dhananjay Phadke
2009-10-27  5:50           ` Eric W. Biederman
2009-10-27  6:06             ` Dhananjay Phadke
2009-05-06  5:05 ` [patch next 4/4] netxen: disable rss for GbE ports Dhananjay Phadke
2009-05-06 22:37   ` David Miller
2009-05-06 23:06     ` Dhananjay Phadke
2009-05-06 23:31       ` David Miller [this message]
2009-05-07  0:08         ` Dhananjay Phadke
2009-05-07  0:28           ` David Miller
2009-05-07  0:31             ` Dhananjay Phadke
2009-05-07  0:40               ` David Miller
2009-05-07  0:42                 ` Dhananjay Phadke
2009-05-07  6:15       ` Jesper Dangaard Brouer
2009-05-07 23:44         ` Dhananjay Phadke

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