netdev - Re: [PATCH net-next v3 1/6] tsnep: Replace modulo operation with mask

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Date:   Thu, 20 Apr 2023 20:40:52 +0200
From:   Gerhard Engleder <gerhard@...leder-embedded.com>
To:     Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org, davem@...emloft.net,
        kuba@...nel.org, edumazet@...gle.com, pabeni@...hat.com,
        bjorn@...nel.org, magnus.karlsson@...el.com,
        jonathan.lemon@...il.com
Subject: Re: [PATCH net-next v3 1/6] tsnep: Replace modulo operation with mask

On 20.04.23 16:23, Maciej Fijalkowski wrote:
> On Tue, Apr 18, 2023 at 09:04:54PM +0200, Gerhard Engleder wrote:
>> TX/RX ring size is static and power of 2 to enable compiler to optimize
>> modulo operation to mask operation. Make this optimization already in
>> the code and don't rely on the compiler.
> 
> I think this came out of my review, so:
> Suggested-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>

Sorry, I forgot to add it.

> Does this give you a minor perf boost?

I will try to measure some difference.