netdev - Re: [PATCH net-next] ibmvnic: Toggle between queue types in affinity mapping

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Message-ID: <20230124183925.257621e8@kernel.org>
Date:   Tue, 24 Jan 2023 18:39:25 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Nick Child <nnac123@...ux.ibm.com>
Cc:     netdev@...r.kernel.org, bjking1@...ux.ibm.com, haren@...ux.ibm.com,
        ricklind@...ibm.com
Subject: Re: [PATCH net-next] ibmvnic: Toggle between queue types in
 affinity mapping

On Mon, 23 Jan 2023 16:17:27 -0600 Nick Child wrote:
> A more optimal algorithm would balance the number RX and TX IRQ's across
> the physical cores. Therefore, to increase performance, distribute RX and
> TX IRQs across cores by alternating between assigning IRQs for RX and TX
> queues to CPUs.
> With a system with 64 CPUs and 32 queues, this results in the following
> pattern (binding is done in reverse order for readable code):
> 
> IRQ type |  CPU number
> -----------------------
> TX15	 |	0-1
> RX15	 |	2-3
> TX14	 |	4-5
> RX14	 |	6-7

Seems sensible but why did you invert the order? To save LoC?