From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 6B604A3168 for ; Wed, 16 Oct 2019 12:30:37 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 270371D406; Wed, 16 Oct 2019 12:30:37 +0200 (CEST) Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by dpdk.org (Postfix) with ESMTP id 9D4F61D3F0 for ; Wed, 16 Oct 2019 12:30:35 +0200 (CEST) Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 06B7AA3CD6A; Wed, 16 Oct 2019 10:30:35 +0000 (UTC) Received: from [10.36.112.44] (ovpn-112-44.ams2.redhat.com [10.36.112.44]) by smtp.corp.redhat.com (Postfix) with ESMTPS id EAEE95D6A9; Wed, 16 Oct 2019 10:30:32 +0000 (UTC) To: Marvin Liu , tiwei.bie@intel.com, zhihong.wang@intel.com, stephen@networkplumber.org, gavin.hu@arm.com Cc: dev@dpdk.org References: <20191015143014.1656-1-yong.liu@intel.com> <20191015160739.51940-1-yong.liu@intel.com> <20191015160739.51940-4-yong.liu@intel.com> From: Maxime Coquelin Autocrypt: addr=maxime.coquelin@redhat.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.0 MIME-Version: 1.0 In-Reply-To: <20191015160739.51940-4-yong.liu@intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.6.2 (mx1.redhat.com [10.5.110.68]); Wed, 16 Oct 2019 10:30:35 +0000 (UTC) Subject: Re: [dpdk-dev] [PATCH v6 03/13] vhost: try to unroll for each loop X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Hi Marvin, On 10/15/19 6:07 PM, Marvin Liu wrote: > Create macro for adding unroll pragma before for each loop. Batch > functions will be contained of several small loops which can be > optimized by compilers' loop unrolling pragma. > > Signed-off-by: Marvin Liu > > diff --git a/lib/librte_vhost/Makefile b/lib/librte_vhost/Makefile > index 8623e91c0..30839a001 100644 > --- a/lib/librte_vhost/Makefile > +++ b/lib/librte_vhost/Makefile > @@ -16,6 +16,24 @@ CFLAGS += -I vhost_user > CFLAGS += -fno-strict-aliasing > LDLIBS += -lpthread > > +ifeq ($(RTE_TOOLCHAIN), gcc) > +ifeq ($(shell test $(GCC_VERSION) -ge 83 && echo 1), 1) > +CFLAGS += -DSUPPORT_GCC_UNROLL_PRAGMA > +endif > +endif > + > +ifeq ($(RTE_TOOLCHAIN), clang) > +ifeq ($(shell test $(CLANG_MAJOR_VERSION)$(CLANG_MINOR_VERSION) -ge 37 && echo 1), 1) > +CFLAGS += -DSUPPORT_CLANG_UNROLL_PRAGMA > +endif > +endif > + > +ifeq ($(RTE_TOOLCHAIN), icc) > +ifeq ($(shell test $(ICC_MAJOR_VERSION) -ge 16 && echo 1), 1) > +CFLAGS += -DSUPPORT_ICC_UNROLL_PRAGMA > +endif > +endif > + > ifeq ($(CONFIG_RTE_LIBRTE_VHOST_NUMA),y) > LDLIBS += -lnuma > endif > diff --git a/lib/librte_vhost/meson.build b/lib/librte_vhost/meson.build > index cb1123ae3..ddf0ee579 100644 > --- a/lib/librte_vhost/meson.build > +++ b/lib/librte_vhost/meson.build > @@ -8,6 +8,13 @@ endif > if has_libnuma == 1 > dpdk_conf.set10('RTE_LIBRTE_VHOST_NUMA', true) > endif > +if (toolchain == 'gcc' and cc.version().version_compare('>=8.3.0')) > + cflags += '-DSUPPORT_GCC_UNROLL_PRAGMA' > +elif (toolchain == 'clang' and cc.version().version_compare('>=3.7.0')) > + cflags += '-DSUPPORT_CLANG_UNROLL_PRAGMA' > +elif (toolchain == 'icc' and cc.version().version_compare('>=16.0.0')) > + cflags += '-DSUPPORT_ICC_UNROLL_PRAGMA' > +endif > dpdk_conf.set('RTE_LIBRTE_VHOST_POSTCOPY', > cc.has_header('linux/userfaultfd.h')) > version = 4 > diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h > index 22a3ddc38..18d01cb19 100644 > --- a/lib/librte_vhost/vhost.h > +++ b/lib/librte_vhost/vhost.h > @@ -39,6 +39,30 @@ > > #define VHOST_LOG_CACHE_NR 32 > > +#define PACKED_BATCH_SIZE (RTE_CACHE_LINE_SIZE / \ > + sizeof(struct vring_packed_desc)) > +#define PACKED_BATCH_MASK (PACKED_BATCH_SIZE - 1) > + > +#ifdef SUPPORT_GCC_UNROLL_PRAGMA > +#define for_each_try_unroll(iter, val, size) _Pragma("GCC unroll 4") \ > + for (iter = val; iter < size; iter++) > +#endif > + > +#ifdef SUPPORT_CLANG_UNROLL_PRAGMA > +#define for_each_try_unroll(iter, val, size) _Pragma("unroll 4") \ > + for (iter = val; iter < size; iter++) > +#endif > + > +#ifdef SUPPORT_ICC_UNROLL_PRAGMA > +#define for_each_try_unroll(iter, val, size) _Pragma("unroll (4)") \ > + for (iter = val; iter < size; iter++) > +#endif > + > +#ifndef for_each_try_unroll > +#define for_each_try_unroll(iter, val, num) \ > + for (iter = val; iter < num; iter++) > +#endif > + > /** > * Structure contains buffer address, length and descriptor index > * from vring to do scatter RX. > As it is Vhost specific, please prefix all the defines and macros with VHOST_. Thanks, Maxime