From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 5960F271468; Thu, 23 Apr 2026 16:33:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776962008; cv=none; b=TjBQn7lFrBmvcjaFasLAIpGX4RO5BzdBAIAJVPw30W7mTFcMaMerVsHVPqouQS4J6EMe9KKAmEQ0RK6WFGCjy5+fIlBW0mNA45xbpHF1itlGRSf7B4IfOH9LG21zn4ELvzrVf30h+YOkUNlu6XDosXCrCOC0qOYsiFvJtSms2/k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776962008; c=relaxed/simple; bh=VwZwd42cMVAV0goCHlzMO4LTjbsf11gIqrR/qAoL6jA=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=d3trt6ZPuhUt2bBFQShI8W7Vo9g4IzWrSXZ3TTFS62akovcFRMVEu6eYxVGHxIDbc+MvaDl5yz2MKvSXi/XGrXcuXJH7Q1eSJdMjSQgjsD4UBDAZOhhVeP0iQLCaZMaOimocmPj8deiMxtn8j0t3SUrVZPFamW2h6RpZDabq4gQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=cE2G68Jy; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="cE2G68Jy" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 985BFC2BCAF; Thu, 23 Apr 2026 16:33:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776962007; bh=VwZwd42cMVAV0goCHlzMO4LTjbsf11gIqrR/qAoL6jA=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=cE2G68JyAF/4s0DiDGfSDhQmctb5RNqsHDZDDoaJWoX/o0/iBagP0h7nPqz/bZ6ZU my2P48n2loX5biCxup24LkHeVVkMbUj/hI1GqehRHmuYlkfs/044KEV5iS9pAc8Xkz sXilEui/bG8GuIGmXiXodIOfCle7JeEbZEctMX4XFP4BpUcWKeQ0fOathtt3UuvRd8 UHH4zB/+Lf1l7ZrczvA2r3YcpfoHzNiL+04EBh/qUt2MpbOnZTITZDULWZ7kKyGR8w Qb17bY3vjofBEvpKuKkGdhXQUlpoVy/vjEy4iOtHOt2aeVA9HCxDf/WBWS3diVv7ax 9F2uyKGkDolXw== Date: Thu, 23 Apr 2026 09:33:25 -0700 From: Jakub Kicinski To: Dipayaan Roy Cc: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, pabeni@redhat.com, leon@kernel.org, longli@microsoft.com, kotaranov@microsoft.com, horms@kernel.org, shradhagupta@linux.microsoft.com, ssengar@linux.microsoft.com, ernis@linux.microsoft.com, shirazsaleem@microsoft.com, linux-hyperv@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, stephen@networkplumber.org, jacob.e.keller@intel.com, leitao@debian.org, kees@kernel.org, john.fastabend@gmail.com, hawk@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, ast@kernel.org, sdf@fomichev.me, dipayanroy@microsoft.com Subject: Re: [PATCH net-next v6 0/2] net: mana: add ethtool private flag for full-page RX buffers Message-ID: <20260423093325.775a4ada@kernel.org> In-Reply-To: References: <20260407200216.272659-1-dipayanroy@linux.microsoft.com> <20260409183509.0b24dea6@kernel.org> <20260412125917.4fa8fc8d@kernel.org> <20260416083146.0bb94d2b@kernel.org> Precedence: bulk X-Mailing-List: bpf@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 Thu, 23 Apr 2026 05:48:11 -0700 Dipayaan Roy wrote: > What I meant is that the atomic refcount cost itself does not appear to > be unique to the affected platform. I see a similar ~5% overhead on > another ARM64 platformi (different vendor) as well. However, on that platform > there is no throughput delta between fragment mode and full-page mode; both reach > line rate. I wonder if it wouldn't be more expedient at this stage to just switch to rx-buf-len rather than investigating in more detail. But we can wait for more data if you prefer. > Please let me know what David finds, and I can rework the patch > accordingly. Haven't heard back. I pinged him now.