From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 030AB331A56; Tue, 18 Aug 2026 15:13:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787066029; cv=none; b=KTQdYORaAdL8nv/IfGoE7UcNZ2essg+KrvnYEsK1Voe8/hBavALxjo4QAbAifQS/BasqlAucgOROPL1fqJftrp6wMW5c72Y4Okaj6pLastW01qUdBPutIpbHgUQuIAps1j7l60lgAQjZ0/KnNI3Z0URAw2sgDAL38elWuueWAFU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787066029; c=relaxed/simple; bh=jKlAHGIyW1XdEBNc87mOjTF/CATWDxpt9ldjR+KIfeg=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Bw9+T19uOdxinBAvUeTYPXjoJAMaENNtDZ/KbW0MC+UrYtinLNZS1yfZ6N6vhtkyVYXPSfeiVUm4JJeDI90byyUxSvdn/bWn1Z4Pn7dPwHSjGzgv6F7sB1J+QXnOTso7YbXZ3toZY1oYkyGrR++NS9dBgQ+lTxGEjuEESbcdLPM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CkCfsRv8; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="CkCfsRv8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4ACF51F00A3D; Tue, 18 Aug 2026 15:13:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1787066027; bh=vtz5ohmkgx1ZhqgNUkiQeH2Xmb5qLJN/8P7aP6EiZU4=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=CkCfsRv8xFr6NKNGhYqI4u0vlK5cbB9siaOYUmlDGK1mCf4nZjia1Eh5Dw0Uh0JGB r/D/mbR8xZG5zKgUaQKaQ8lyfjwi8cbD2SZvkAUKT7GOBIW/yHHYwae+auhQNCHyHL ZgdPJsczLIdl5obd/lWz6SecgK9Jo4uCB9d94EFB82MUeunTd4OWnkrSu3w391XM2F X0vLOL1+IpzorwVyFyAuwTqJk658+5jXgQL+yZbRhTGFnUGJ5iw8pCL8EFsb+L4fhL SJbx7biVNLcpkmz5LV6n6AFEKJXwrQTMJ2g/VyQdLx4SO4gZG4UPcgMbWnKyL4YoZX 6NxYex8HAr4QA== Date: Tue, 18 Aug 2026 08:13:46 -0700 From: Jakub Kicinski To: Ziran Zhang Cc: Eric Dumazet , Neal Cardwell , "David S . Miller" , Paolo Abeni , Kuniyuki Iwashima , Simon Horman , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: Re: [PATCH net-next] tcp: fix mdev comment in tcp_rtt_estimator() Message-ID: <20260818081346.03773154@kernel.org> In-Reply-To: <20260818085153.18509-1-zhangcoder@yeah.net> References: <20260818085153.18509-1-zhangcoder@yeah.net> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Tue, 18 Aug 2026 16:51:53 +0800 Ziran Zhang wrote: > The old comment "mdev = 3/4 mdev + 1/4 new" only describes the > common case. However, when RTT drops sharply, the code applies > a finer gain of 1/32 instead of 1/4, resulting in: > mdev = 31/32 mdev + 1/32 * new. > > Express both cases with a unified formula using variable > gain g. ## Form letter - net-next-closed The merge window for v7.3 has started, and therefore net-next is closed for new drivers, features, code refactoring and optimizations. We will only consider applying net-next patches which were posted before the announcement: https://lore.kernel.org/20260816155953.072d73da@kernel.org Fixes are obviously welcome at any time. net-next patches may be sent for review and discussion only with an RFC tag. Please repost when net-next reopens. See: https://www.kernel.org/doc/html/next/process/maintainer-netdev.html#development-cycle -- pw-bot: defer pv-bot: closed