netdev - Re: [PATCH net-next] net/mlx4

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Message-Id: <20160609.234007.1351432057965400024.davem@davemloft.net>
Date:	Thu, 09 Jun 2016 23:40:07 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	ttoukan.linux@...il.com, maze@...gle.com, edumazet@...gle.com,
	netdev@...r.kernel.org, willemb@...gle.com, eugenia@...lanox.com,
	weiwan@...gle.com
Subject: Re: [PATCH net-next] net/mlx4_en: fix ethtool -x

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 07 Jun 2016 21:24:18 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> mlx4 RSS is limited to spread incoming packets to a power of two number
> of queues.
> 
> An uniformly distibuted traffic would be split on queues 0 to N-1, N
> being a power of two, each queue having a 1/N weight.
> 
> If number of RX queues is not a power of two, upper RX queues do not
> receive traffic.
> 
> ethtool -x is lying, because it pretends some queues have higher weight.
 ...
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: Maciej Żenczykowski <maze@...gle.com>

Applied.