netdev - RE: [PATCH v2] net: mana: Batch ringing RX queue doorbell on receiving packets

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Date: Fri, 23 Jun 2023 03:00:05 +0000
From: Dexuan Cui <decui@...rosoft.com>
To: "longli@...uxonhyperv.com" <longli@...uxonhyperv.com>, Jason Gunthorpe
	<jgg@...pe.ca>, Leon Romanovsky <leon@...nel.org>, Ajay Sharma
	<sharmaajay@...rosoft.com>, KY Srinivasan <kys@...rosoft.com>, Haiyang Zhang
	<haiyangz@...rosoft.com>, Wei Liu <wei.liu@...nel.org>, "David S. Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
CC: "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Long Li
	<longli@...rosoft.com>, "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH v2] net: mana: Batch ringing RX queue doorbell on
 receiving packets

> From: longli@...uxonhyperv.com
> Sent: Thursday, June 22, 2023 9:23 AM
>  ...
> 
> It's inefficient to ring the doorbell page every time a WQE is posted to
> the received queue.
> 
> Move the code for ringing doorbell page to where after we have posted all
> WQEs to the receive queue during a callback from napi_poll().
> 
> Tests showed no regression in network latency benchmarks.
> 
> Cc: stable@...r.kernel.org
> Fixes: ca9c54d2d6a5 ("net: mana: Add a driver for Microsoft Azure Network
> Adapter (MANA)")
> Signed-off-by: Long Li <longli@...rosoft.com>

Reviewed-by: Dexuan Cui <decui@...rosoft.com>