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 9A21639151C; Mon, 6 Apr 2026 17:51:38 +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=1775497898; cv=none; b=rcDShFXBpDaOo5hFfP3e1yKaMRiH66+utEfMsg2ZCqs4oadmwiPc1j7QWYrH00WR8JzMNxb/9xiKtO2y0KnLRDS7rxfKpN0p5Lz4YVf5E4fBMhRF+L50rkguagwWRLdkEfDGhyRUizDHeNK7ksTWJHTlVCd4FpJWIobmjeKrjXQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775497898; c=relaxed/simple; bh=aOE7o6CfWDeEXlNasCvA6VtuO3c6A+iWm2BI/VVTy8U=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=QZsrjJpJxEn0K0q/04t62BzG9guSd5iiBaX6YCW0ZqP2Qkhm6Nm2EnM2GLC0eY4ErH0H1Iijm06CtFKC4/K31BXnI4YU/dGA7DDhxjUINtv4x0jnVsvTZNB/w3bpvuAo/A83qSJNHgxCnzO9Q2fgSvV5WU68mHZlAzo02TCJX6g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=RLWGHv2n; 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="RLWGHv2n" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3CB90C4CEF7; Mon, 6 Apr 2026 17:51:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1775497898; bh=aOE7o6CfWDeEXlNasCvA6VtuO3c6A+iWm2BI/VVTy8U=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=RLWGHv2nHqR6OOlc3WD9/QohEKn5qnQ0C4IlpSX9N1dC2BeLGFibY+wyKS+IKcd3/ zmm5UPjEYYMXiZXlZ2pjNRmhki7GdfgVWCB4ok9RwJ40MQeSgIzG7a4D4b1xOov2RY XlurxrQXxxFi3tcS9vXrGa0J7cldmy/HeoL6TIrl5ABZ92dcu/f8hwCyhUP60oyZu1 SZcVnOB1x/uxszZ+++xx/VeDJDyeQ7WGw05PkLndcURL1sXEovvBssdHqiKagVLyQL Ua/8tOCgFLZ8gLpD9ZYnl1JBZrv9jrd1f5QGS6tazDVGFQIOslIxIiVvLsYOyumf7u 9cxsF0aXd0wqQ== Date: Mon, 6 Apr 2026 10:51:36 -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, dipayanroy@microsoft.com Subject: Re: [PATCH net-next,v4] net: mana: Force full-page RX buffers via ethtool private flag Message-ID: <20260406105136.5e02420e@kernel.org> In-Reply-To: References: <20260330154755.6a8c73a6@kernel.org> 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=UTF-8 Content-Transfer-Encoding: quoted-printable On Sat, 4 Apr 2026 20:14:35 -0700 Dipayaan Roy wrote: > Function Fragment Full-page Delta > =E2=94=80---------------------------- =E2=94=80------- --------- = ----- > napi_pp_put_page 3.93% 0.85% +3.08% > page_pool_alloc_frag_netmem 1.93% =E2=80=94 +1.93% > Total page_pool overhead 5.86% 0.85% +5.01% Thanks for the analysis, and presumably recycling the full page is cheaper because page_pool_put_unrefed_netmem() hits the fastpath because page_pool_napi_local() returns true?