netdev - Re: [PATCH net-next] r8169: set IRQF_NO

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Message-ID: <20201103173756.5f495c7e@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Tue, 3 Nov 2020 17:37:56 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        Realtek linux nic maintainers <nic_swsd@...ltek.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] r8169: set IRQF_NO_THREAD if MSI(X) is enabled

On Sun, 1 Nov 2020 23:30:44 +0100 Heiner Kallweit wrote:
> We had to remove flag IRQF_NO_THREAD because it conflicts with shared
> interrupts in case legacy interrupts are used. Following up on the
> linked discussion set IRQF_NO_THREAD if MSI or MSI-X is used, because
> both guarantee that interrupt won't be shared.
> 
> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
> Link: https://www.spinics.net/lists/netdev/msg695341.html

Applied, based on my understanding on RT. But I do agree with Vladimir
that it'd be good to see actual performance numbers for these sort of
optimizations.