netdev - Re: [PATCH net-next 05/12] net/mlx5e: Poll rx cq before tx cq to improve round-trip latency

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Message-Id: <20150622.063554.1081040359354241131.davem@davemloft.net>
Date:	Mon, 22 Jun 2015 06:35:54 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	achiad.mellanox@...il.com
Cc:	ogerlitz@...lanox.com, netdev@...r.kernel.org, amirv@...lanox.com,
	talal@...lanox.com, saeedm@...lanox.com
Subject: Re: [PATCH net-next 05/12] net/mlx5e: Poll rx cq before tx cq to
 improve round-trip latency

From: achiad shochat <achiad.mellanox@...il.com>
Date: Mon, 22 Jun 2015 00:35:37 +0300

> Hello Dave,
> 
> In mlx5 the RX processing is broken down into two stages:
> 1) Hand to kernel SKBs of completed RX packets - @mlx5e_poll_rx_cq()
> 2) Allocate and post to HW new RX buffers - @mlx5e_post_rx_wqes()
> 
> Would handling of TX completions in between stages (1) and (2) be OK?

I would do all of TX processing first and synchronously.  It's very
cheap and makes lots of resources available for RX processing.
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