From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D9D2AC2F441 for ; Mon, 21 Jan 2019 16:42:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A973820870 for ; Mon, 21 Jan 2019 16:42:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730412AbfAUQmG (ORCPT ); Mon, 21 Jan 2019 11:42:06 -0500 Received: from mx3.molgen.mpg.de ([141.14.17.11]:57233 "EHLO mx1.molgen.mpg.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1730347AbfAUQmG (ORCPT ); Mon, 21 Jan 2019 11:42:06 -0500 Received: from keineahnung.molgen.mpg.de (keineahnung.molgen.mpg.de [141.14.17.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pmenzel) by mx.molgen.mpg.de (Postfix) with ESMTPSA id F2BD420135342C; Mon, 21 Jan 2019 17:42:02 +0100 (CET) Subject: Re: [Intel-wired-lan] [PATCH] i40e: replace switch-statement with if-clause To: =?UTF-8?B?QmrDtnJuIFTDtnBlbA==?= , intel-wired-lan@lists.osuosl.org Cc: netdev@vger.kernel.org, =?UTF-8?B?QmrDtnJuIFTDtnBlbA==?= , magnus.karlsson@gmail.com, magnus.karlsson@intel.com, brouer@redhat.com References: <20190121163356.31332-1-bjorn.topel@gmail.com> From: Paul Menzel Message-ID: <60f67e64-568c-bf04-5e9c-0429c5ae2882@molgen.mpg.de> Date: Mon, 21 Jan 2019 17:42:02 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20190121163356.31332-1-bjorn.topel@gmail.com> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms090507000902080900010507" Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This is a cryptographically signed message in MIME format. --------------ms090507000902080900010507 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable Dear Bj=C3=B6rn, On 01/21/19 17:33, bjorn.topel@gmail.com wrote: > From: Bj=C3=B6rn T=C3=B6pel >=20 > GCC will generate jump tables for switch-statements with more than 5 > case statements. An entry into the jump table is an indirect call, > which means that for CONFIG_RETPOLINE builds, this is rather > expensive. >=20 > This commit replaces the switch-statement that acts on the XDP program > result with an if-clause. Maybe mention the performance improvement already here. I=E2=80=99d also = put it into the commit message summary. Something like: > i40e: Speed up retpoline case by using if-clause If that jump tables are a common problem, I wonder, why the compiler cannot be adapted to generate better performing code or an option passed to the compiler. > The if-clause was also refactored into a common function that can be > used by AF_XDP zero-copy and non-zero-copy code. >=20 > Performance prior this patch: > $ sudo ./xdp_rxq_info --dev enp134s0f0 --action XDP_DROP > Running XDP on dev:enp134s0f0 (ifindex:7) action:XDP_DROP options:no_to= uch > XDP stats CPU pps issue-pps > XDP-RX CPU 20 18983018 0 > XDP-RX CPU total 18983018 >=20 > RXQ stats RXQ:CPU pps issue-pps > rx_queue_index 20:20 18983012 0 > rx_queue_index 20:sum 18983012 >=20 > $ sudo ./xdpsock -i enp134s0f0 -q 20 -n 2 -z -r > sock0@enp134s0f0:20 rxdrop > pps pkts 2.00 > rx 14,641,496 144,751,092 > tx 0 0 >=20 > And after: > $ sudo ./xdp_rxq_info --dev enp134s0f0 --action XDP_DROP > Running XDP on dev:enp134s0f0 (ifindex:7) action:XDP_DROP options:no_to= uch > XDP stats CPU pps issue-pps > XDP-RX CPU 20 24000986 0 > XDP-RX CPU total 24000986 >=20 > RXQ stats RXQ:CPU pps issue-pps > rx_queue_index 20:20 24000985 0 > rx_queue_index 20:sum 24000985 >=20 > +26% >=20 > $ sudo ./xdpsock -i enp134s0f0 -q 20 -n 2 -z -r > sock0@enp134s0f0:20 rxdrop > pps pkts 2.00 > rx 17,623,578 163,503,263 > tx 0 0 >=20 > +20% >=20 > Signed-off-by: Bj=C3=B6rn T=C3=B6pel > --- > drivers/net/ethernet/intel/i40e/i40e_txrx.c | 31 ++++---------------= > .../ethernet/intel/i40e/i40e_txrx_common.h | 27 ++++++++++++++++ > drivers/net/ethernet/intel/i40e/i40e_xsk.c | 24 ++------------ > 3 files changed, 35 insertions(+), 47 deletions(-) [=E2=80=A6] Kind regards, Paul --------------ms090507000902080900010507 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature 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tables for switch-statements with more than 5 > case statements. An entry into the jump table is an indirect call, > which means that for CONFIG_RETPOLINE builds, this is rather > expensive. > > This commit replaces the switch-statement that acts on the XDP program > result with an if-clause. Maybe mention the performance improvement already here. I?d also put it into the commit message summary. Something like: > i40e: Speed up retpoline case by using if-clause If that jump tables are a common problem, I wonder, why the compiler cannot be adapted to generate better performing code or an option passed to the compiler. > The if-clause was also refactored into a common function that can be > used by AF_XDP zero-copy and non-zero-copy code. > > Performance prior this patch: > $ sudo ./xdp_rxq_info --dev enp134s0f0 --action XDP_DROP > Running XDP on dev:enp134s0f0 (ifindex:7) action:XDP_DROP options:no_touch > XDP stats CPU pps issue-pps > XDP-RX CPU 20 18983018 0 > XDP-RX CPU total 18983018 > > RXQ stats RXQ:CPU pps issue-pps > rx_queue_index 20:20 18983012 0 > rx_queue_index 20:sum 18983012 > > $ sudo ./xdpsock -i enp134s0f0 -q 20 -n 2 -z -r > sock0 at enp134s0f0:20 rxdrop > pps pkts 2.00 > rx 14,641,496 144,751,092 > tx 0 0 > > And after: > $ sudo ./xdp_rxq_info --dev enp134s0f0 --action XDP_DROP > Running XDP on dev:enp134s0f0 (ifindex:7) action:XDP_DROP options:no_touch > XDP stats CPU pps issue-pps > XDP-RX CPU 20 24000986 0 > XDP-RX CPU total 24000986 > > RXQ stats RXQ:CPU pps issue-pps > rx_queue_index 20:20 24000985 0 > rx_queue_index 20:sum 24000985 > > +26% > > $ sudo ./xdpsock -i enp134s0f0 -q 20 -n 2 -z -r > sock0 at enp134s0f0:20 rxdrop > pps pkts 2.00 > rx 17,623,578 163,503,263 > tx 0 0 > > +20% > > Signed-off-by: Bj?rn T?pel > --- > drivers/net/ethernet/intel/i40e/i40e_txrx.c | 31 ++++--------------- > .../ethernet/intel/i40e/i40e_txrx_common.h | 27 ++++++++++++++++ > drivers/net/ethernet/intel/i40e/i40e_xsk.c | 24 ++------------ > 3 files changed, 35 insertions(+), 47 deletions(-) [?] Kind regards, Paul -------------- next part -------------- A non-text attachment was scrubbed... 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