linux-kernel - RE: Re: [PATCH net] octeontx2-pf: Set maximum queue size to 16K

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Message-ID: <CY4PR1801MB1911E15D518A77535F6E51E2D308A@CY4PR1801MB1911.namprd18.prod.outlook.com>
Date:   Thu, 3 Aug 2023 02:08:18 +0000
From:   Ratheesh Kannoth <rkannoth@...vell.com>
To:     Alexander Lobakin <aleksander.lobakin@...el.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Sunil Kovvuri Goutham <sgoutham@...vell.com>,
        Geethasowjanya Akula <gakula@...vell.com>,
        Subbaraya Sundeep Bhatta <sbhatta@...vell.com>,
        Hariprasad Kelam <hkelam@...vell.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>
Subject: RE: Re: [PATCH net] octeontx2-pf: Set maximum queue size to 16K

> From: Alexander Lobakin <aleksander.lobakin@...el.com>
> Sent: Wednesday, August 2, 2023 9:42 PM
> To: Ratheesh Kannoth <rkannoth@...vell.com>
> Subject: [EXT] Re: [PATCH net] octeontx2-pf: Set maximum queue size to 16K

> +ring->rx_max_pending = 16384; /* Page pool support on RX */
> 
> This is very hardcodish. Why not limit the Page Pool size when creating
> instead? It's perfectly fine to have a queue with 64k descriptors and a Page
> Pool with only ("only" :D) 16k elements.
> Page Pool size affects only the size of the embedded ptr_ring, which is used
> for indirect (locking) recycling. I would even recommend to not go past 2k for
> PP sizes, it makes no sense and only consumes memory.

These recycling will impact on performance, right ? else, why didn't page pool made this size as constant.