netdev - Re: [PATCH net] cxgb4: request the TX CIDX updates to status page

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Date:   Fri, 25 Oct 2019 20:21:51 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     rajur@...lsio.com
Cc:     netdev@...r.kernel.org, vishal@...lsio.com, nirranjan@...lsio.com,
        dt@...lsio.com
Subject: Re: [PATCH net] cxgb4: request the TX CIDX updates to status page

From: Raju Rangoju <rajur@...lsio.com>
Date: Wed, 23 Oct 2019 23:03:55 +0530

> For adapters which support the SGE Doorbell Queue Timer facility,
> we configured the Ethernet TX Queues to send CIDX Updates to the
> Associated Ethernet RX Response Queue with CPL_SGE_EGR_UPDATE
> messages to allow us to respond more quickly to the CIDX Updates.
> But, this was adding load to PCIe Link RX bandwidth and,
> potentially, resulting in higher CPU Interrupt load.
> 
> This patch requests the HW to deliver the CIDX updates to the TX
> queue status page rather than generating an ingress queue message
> (as an interrupt). With this patch, the load on RX bandwidth is
> reduced and a substantial improvement in BW is noticed at lower
> IO sizes.
> 
> Fixes: d429005fdf2c ("cxgb4/cxgb4vf: Add support for SGE doorbell queue timer")
> Signed-off-by: Raju Rangoju <rajur@...lsio.com>

Applied and queued up for -stable.