netdev - Re: [PATCH v2 net] ibmveth: Reduce maximum tx queues to 8

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Message-ID: <20221103205945.40aacd90@kernel.org>
Date:   Thu, 3 Nov 2022 20:59:45 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Nick Child <nnac123@...ux.ibm.com>
Cc:     netdev@...r.kernel.org, nick.child@....com, bjking1@...ux.ibm.com,
        ricklind@...ibm.com, dave.taht@...il.com
Subject: Re: [PATCH v2 net] ibmveth: Reduce maximum tx queues to 8

On Wed,  2 Nov 2022 13:38:37 -0500 Nick Child wrote:
> Previously, the maximum number of transmit queues allowed was 16. Due to
> resource concerns, limit to 8 queues instead.
> 
> Since the driver is virtualized away from the physical NIC, the purpose
> of multiple queues is purely to allow for parallel calls to the
> hypervisor. Therefore, there is no noticeable effect on performance by
> reducing queue count to 8.

I'm not sure if that's the point Dave was making but we should be
influencing the default, not the MAX. Why limit the MAX?