netdev - Re: [PATCH v2 net-next 00/12] net: stmmac: Clean-up and tune-up

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Message-Id: <20180516.145611.65752290278287985.davem@davemloft.net>
Date:   Wed, 16 May 2018 14:56:11 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     Jose.Abreu@...opsys.com
Cc:     netdev@...r.kernel.org, Joao.Pinto@...opsys.com,
        Vitor.Soares@...opsys.com, peppe.cavallaro@...com,
        alexandre.torgue@...com
Subject: Re: [PATCH v2 net-next 00/12] net: stmmac: Clean-up and tune-up

From: Jose Abreu <Jose.Abreu@...opsys.com>
Date: Wed, 16 May 2018 13:50:42 +0100

> David raised some rightfull constrains about the use of indirect callbacks in
> the code. I did iperf tests with and without patches 3-12 and the performance
> remained equal. I guess for 1Gb/s and because my setup has a powerfull
> processor these patches don't affect the performance.

Does your cpu need Spectre v1 and v2 workarounds which cause indirect calls to
be extremely expensive?

That's the case I'm worried about.