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Date: Wed, 2 Nov 2022 14:25:17 +0100 From: Nicolas Dichtel <nicolas.dichtel@...nd.com> To: Ilya Maximets <i.maximets@....org>, netdev@...r.kernel.org Cc: Jakub Kicinski <kuba@...nel.org>, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org Subject: Re: [PATCH net-next] net: tun: bump the link speed from 10Mbps to 10Gbps Le 31/10/2022 à 18:39, Ilya Maximets a écrit : > The 10Mbps link speed was set in 2004 when the ethtool interface was > initially added to the tun driver. It might have been a good > assumption 18 years ago, but CPUs and network stack came a long way > since then. > > Other virtual ports typically report much higher speeds. For example, > veth reports 10Gbps since its introduction in 2007. > > Some userspace applications rely on the current link speed in > certain situations. For example, Open vSwitch is using link speed > as an upper bound for QoS configuration if user didn't specify the > maximum rate. Advertised 10Mbps doesn't match reality in a modern > world, so users have to always manually override the value with > something more sensible to avoid configuration issues, e.g. limiting > the traffic too much. This also creates additional confusion among > users. > > Bump the advertised speed to at least match the veth. > > Alternative might be to explicitly report UNKNOWN and let the user > decide on a right value for them. And it is indeed "the right way" > of fixing the problem. However, that may cause issues with bonding > or with some userspace applications that may rely on speed value to > be reported (even though they should not). Just changing the speed > value should be a safer option. > > Users can still override the speed with ethtool, if necessary. > > RFC discussion is linked below. > > Link: https://lore.kernel.org/lkml/20221021114921.3705550-1-i.maximets@ovn.org/ > Link: https://mail.openvswitch.org/pipermail/ovs-discuss/2022-July/051958.html > Signed-off-by: Ilya Maximets <i.maximets@....org> Reviewed-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
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