netdev - Re: [PATCH V2 net-next] liquidio: xmit

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Date:   Sat, 28 Oct 2017 00:35:46 +0900 (KST)
From:   David Miller <davem@...emloft.net>
To:     felix.manlunas@...ium.com
Cc:     netdev@...r.kernel.org, raghu.vatsavayi@...ium.com,
        derek.chickles@...ium.com, satananda.burla@...ium.com,
        intiyaz.basha@...ium.com
Subject: Re: [PATCH V2 net-next] liquidio: xmit_more support

From: Felix Manlunas <felix.manlunas@...ium.com>
Date: Thu, 26 Oct 2017 16:18:20 -0700

> From: Intiyaz Basha <intiyaz.basha@...ium.com>
> 
> Defer ringing the Tx doorbell if skb->xmit_more is set unless the Tx queue
> is full or stopped.  To keep latency low, use a deferral limit of 8
> packets.  We chose 8 because Octeon can fetch at most 8 packets in a single
> PCI read, and our tests show that 8 results in low latency.
> 
> Signed-off-by: Intiyaz Basha <intiyaz.basha@...ium.com>
> Signed-off-by: Satanand Burla <satananda.burla@...ium.com>
> Signed-off-by: Felix Manlunas <felix.manlunas@...ium.com>
> ---
> Patch Change Log:
>   V1 -> V2:
>     Add a Tx doorbell ring deferral limit as suggested by David Miller

Applied, thank you.