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

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Date:   Thu, 22 Jun 2023 21:27:28 +0000
From:   Haiyang Zhang <haiyangz@...rosoft.com>
To:     "longli@...uxonhyperv.com" <longli@...uxonhyperv.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>,
        Ajay Sharma <sharmaajay@...rosoft.com>,
        Dexuan Cui <decui@...rosoft.com>,
        KY Srinivasan <kys@...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



> -----Original Message-----
> From: longli@...uxonhyperv.com <longli@...uxonhyperv.com>
> Sent: Thursday, June 22, 2023 12:23 PM
> To: Jason Gunthorpe <jgg@...pe.ca>; Leon Romanovsky <leon@...nel.org>;
> Ajay Sharma <sharmaajay@...rosoft.com>; Dexuan Cui
> <decui@...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-hyperv@...r.kernel.org;
> netdev@...r.kernel.org; linux-kernel@...r.kernel.org; Long Li
> <longli@...rosoft.com>; stable@...r.kernel.org
> Subject: [PATCH v2] net: mana: Batch ringing RX queue doorbell on receiving
> packets
> 
> From: Long Li <longli@...rosoft.com>
> 
> 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: Haiyang Zhang <haiyangz@...rosoft.com>