linux-kernel - Re: [PATCH net-next v6 0/8] tun/tap & vhost-net: netdev queue flow control to avoid ptr

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Message-ID: <20251126021327-mutt-send-email-mst@kernel.org>
Date: Wed, 26 Nov 2025 02:15:16 -0500
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Simon Schippers <simon.schippers@...dortmund.de>
Cc: Jason Wang <jasowang@...hat.com>, willemdebruijn.kernel@...il.com,
	andrew+netdev@...n.ch, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, eperezma@...hat.com,
	jon@...anix.com, tim.gebauer@...dortmund.de, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	virtualization@...ts.linux.dev
Subject: Re: [PATCH net-next v6 0/8] tun/tap & vhost-net: netdev queue flow
 control to avoid ptr_ring tail drop

On Fri, Nov 21, 2025 at 10:22:54AM +0100, Simon Schippers wrote:
> I agree, but I really would like to reduce the buffer bloat caused by the
> default 500 TUN / 1000 TAP packet queue without losing performance.

that default is part of the userspace API and can't be changed.
just change whatever userspace is creating your device.

-- 
MST