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

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Date:	Tue, 23 Jun 2015 17:12:54 +0300
From:	Or Gerlitz <ogerlitz@...lanox.com>
To:	David Miller <davem@...emloft.net>, <achiad.mellanox@...il.com>
CC:	<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

On 6/22/2015 4:35 PM, David Miller wrote:
> 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.

So we'll drop this patch.

Or.
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