netdev - Re: [RFC Patch v1 1/3] net: ena: implement local page cache (LPC) system

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Date:   Wed, 10 Mar 2021 03:04:31 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Shay Agroskin <shayagr@...zon.com>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        "Woodhouse, David" <dwmw@...zon.com>,
        "Machulsky, Zorik" <zorik@...zon.com>,
        "Matushevsky, Alexander" <matua@...zon.com>,
        Saeed Bshara <saeedb@...zon.com>,
        "Wilson, Matt" <msw@...zon.com>,
        "Liguori, Anthony" <aliguori@...zon.com>,
        "Bshara, Nafea" <nafea@...zon.com>,
        "Tzalik, Guy" <gtzalik@...zon.com>,
        "Belgazal, Netanel" <netanel@...zon.com>,
        "Saidi, Ali" <alisaidi@...zon.com>,
        "Herrenschmidt, Benjamin" <benh@...zon.com>,
        "Kiyanovski, Arthur" <akiyano@...zon.com>,
        "Jubran, Samih" <sameehj@...zon.com>,
        "Dagan, Noam" <ndagan@...zon.com>
Subject: Re: [RFC Patch v1 1/3] net: ena: implement local page cache (LPC)
 system

On Tue, Mar 09, 2021 at 06:57:06PM +0100, Eric Dumazet wrote:
> 
> 
> On 3/9/21 6:10 PM, Shay Agroskin wrote:
> > The page cache holds pages we allocated in the past during napi cycle,
> > and tracks their availability status using page ref count.
> > 
> > The cache can hold up to 2048 pages. Upon allocating a page, we check
> > whether the next entry in the cache contains an unused page, and if so
> > fetch it. If the next page is already used by another entity or if it
> > belongs to a different NUMA core than the napi routine, we allocate a
> > page in the regular way (page from a different NUMA core is replaced by
> > the newly allocated page).
> > 
> > This system can help us reduce the contention between different cores
> > when allocating page since every cache is unique to a queue.
> 
> For reference, many drivers already use a similar strategy.

Hi Eric

So rather than yet another implementation, should we push for a
generic implementation which any driver can use?

	Andrew