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GET /api/patches/59726/?format=api
{ "id": 59726, "url": "http://patchwork.dpdk.org/api/patches/59726/?format=api", "web_url": "http://patchwork.dpdk.org/project/dpdk/patch/20190925171329.63734-15-yong.liu@intel.com/", "project": { "id": 1, "url": "http://patchwork.dpdk.org/api/projects/1/?format=api", "name": "DPDK", "link_name": "dpdk", "list_id": "dev.dpdk.org", "list_email": "dev@dpdk.org", "web_url": "http://core.dpdk.org", "scm_url": "git://dpdk.org/dpdk", "webscm_url": "http://git.dpdk.org/dpdk", "list_archive_url": "https://inbox.dpdk.org/dev", "list_archive_url_format": "https://inbox.dpdk.org/dev/{}", "commit_url_format": "" }, "msgid": "<20190925171329.63734-15-yong.liu@intel.com>", "list_archive_url": "https://inbox.dpdk.org/dev/20190925171329.63734-15-yong.liu@intel.com", "date": "2019-09-25T17:13:28", "name": "[v3,14/15] vhost: check whether disable software pre-fetch", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": true, "hash": "ef581088cdf57b7991d88fc79addb3eddeac00c9", "submitter": { "id": 17, "url": "http://patchwork.dpdk.org/api/people/17/?format=api", "name": "Marvin Liu", "email": "yong.liu@intel.com" }, "delegate": { "id": 2642, "url": "http://patchwork.dpdk.org/api/users/2642/?format=api", "username": "mcoquelin", "first_name": "Maxime", "last_name": "Coquelin", "email": "maxime.coquelin@redhat.com" }, "mbox": "http://patchwork.dpdk.org/project/dpdk/patch/20190925171329.63734-15-yong.liu@intel.com/mbox/", "series": [ { "id": 6522, "url": "http://patchwork.dpdk.org/api/series/6522/?format=api", "web_url": "http://patchwork.dpdk.org/project/dpdk/list/?series=6522", "date": "2019-09-25T17:13:14", "name": "vhost packed ring performance optimization", "version": 3, "mbox": "http://patchwork.dpdk.org/series/6522/mbox/" } ], "comments": "http://patchwork.dpdk.org/api/patches/59726/comments/", "check": "fail", "checks": "http://patchwork.dpdk.org/api/patches/59726/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<dev-bounces@dpdk.org>", "X-Original-To": "patchwork@dpdk.org", "Delivered-To": "patchwork@dpdk.org", "Received": [ "from [92.243.14.124] (localhost [127.0.0.1])\n\tby dpdk.org (Postfix) with ESMTP id 71E1F1BF03;\n\tWed, 25 Sep 2019 11:33:20 +0200 (CEST)", "from mga04.intel.com (mga04.intel.com [192.55.52.120])\n\tby dpdk.org (Postfix) with ESMTP id CD41A1BE98\n\tfor <dev@dpdk.org>; Wed, 25 Sep 2019 11:33:00 +0200 (CEST)", "from fmsmga004.fm.intel.com ([10.253.24.48])\n\tby fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384;\n\t25 Sep 2019 02:32:51 -0700", "from npg-dpdk-virtual-marvin-dev.sh.intel.com ([10.67.119.142])\n\tby fmsmga004.fm.intel.com with ESMTP; 25 Sep 2019 02:32:49 -0700" ], "X-Amp-Result": "SKIPPED(no attachment in message)", "X-Amp-File-Uploaded": "False", "X-ExtLoop1": "1", "X-IronPort-AV": "E=Sophos;i=\"5.64,547,1559545200\"; d=\"scan'208\";a=\"213986315\"", "From": "Marvin Liu <yong.liu@intel.com>", "To": "maxime.coquelin@redhat.com, tiwei.bie@intel.com, zhihong.wang@intel.com, \n\tstephen@networkplumber.org, gavin.hu@arm.com", "Cc": "dev@dpdk.org,\n\tMarvin Liu <yong.liu@intel.com>", "Date": "Thu, 26 Sep 2019 01:13:28 +0800", "Message-Id": "<20190925171329.63734-15-yong.liu@intel.com>", "X-Mailer": "git-send-email 2.17.1", "In-Reply-To": "<20190925171329.63734-1-yong.liu@intel.com>", "References": "<20190919163643.24130-2-yong.liu@intel.com>\n\t<20190925171329.63734-1-yong.liu@intel.com>", "Subject": "[dpdk-dev] [PATCH v3 14/15] vhost: check whether disable software\n\tpre-fetch", "X-BeenThere": "dev@dpdk.org", "X-Mailman-Version": "2.1.15", "Precedence": "list", "List-Id": "DPDK patches and discussions <dev.dpdk.org>", "List-Unsubscribe": "<https://mails.dpdk.org/options/dev>,\n\t<mailto:dev-request@dpdk.org?subject=unsubscribe>", "List-Archive": "<http://mails.dpdk.org/archives/dev/>", "List-Post": "<mailto:dev@dpdk.org>", "List-Help": "<mailto:dev-request@dpdk.org?subject=help>", "List-Subscribe": "<https://mails.dpdk.org/listinfo/dev>,\n\t<mailto:dev-request@dpdk.org?subject=subscribe>", "Errors-To": "dev-bounces@dpdk.org", "Sender": "\"dev\" <dev-bounces@dpdk.org>" }, "content": "Disable software pre-fetch actions on Skylake and later platforms.\nHardware can fetch needed data for vhost, additional software pre-fetch\nwill impact performance.\n\nSigned-off-by: Marvin Liu <yong.liu@intel.com>", "diff": "diff --git a/lib/librte_vhost/Makefile b/lib/librte_vhost/Makefile\nindex 30839a001..5f3b42e56 100644\n--- a/lib/librte_vhost/Makefile\n+++ b/lib/librte_vhost/Makefile\n@@ -16,6 +16,12 @@ CFLAGS += -I vhost_user\n CFLAGS += -fno-strict-aliasing\n LDLIBS += -lpthread\n \n+AVX512_SUPPORT=$(shell $(CC) -march=native -dM -E - </dev/null |grep AVX512F)\n+\n+ifneq ($(AVX512_SUPPORT),)\n+CFLAGS += -DDISABLE_SWPREFETCH\n+endif\n+\n ifeq ($(RTE_TOOLCHAIN), gcc)\n ifeq ($(shell test $(GCC_VERSION) -ge 83 && echo 1), 1)\n CFLAGS += -DSUPPORT_GCC_UNROLL_PRAGMA\ndiff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c\nindex 20624efdc..e3872e384 100644\n--- a/lib/librte_vhost/virtio_net.c\n+++ b/lib/librte_vhost/virtio_net.c\n@@ -1075,7 +1075,9 @@ virtio_dev_rx_batch_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,\n \n \tUNROLL_PRAGMA(UNROLL_PRAGMA_PARAM)\n \tfor (i = 0; i < PACKED_BATCH_SIZE; i++) {\n+#ifndef DISABLE_SWPREFETCH\n \t\trte_prefetch0((void *)(uintptr_t)desc_addrs[i]);\n+#endif\n \t\thdrs[i] = (struct virtio_net_hdr_mrg_rxbuf *)\n \t\t\t\t\t(uintptr_t)desc_addrs[i];\n \t\tlens[i] = pkts[i]->pkt_len + dev->vhost_hlen;\n@@ -1144,8 +1146,10 @@ virtio_dev_rx_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,\n \tuint32_t remained = count;\n \n \tdo {\n+#ifndef DISABLE_SWPREFETCH\n \t\trte_prefetch0(&vq->desc_packed[vq->last_avail_idx &\n \t\t\t(vq->size - 1)]);\n+#endif\n \t\tif (remained >= PACKED_BATCH_SIZE) {\n \t\t\tif (!virtio_dev_rx_batch_packed(dev, vq, pkts)) {\n \t\t\t\tpkt_idx += PACKED_BATCH_SIZE;\n@@ -1790,7 +1794,9 @@ virtio_dev_tx_batch_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,\n \n \tUNROLL_PRAGMA(UNROLL_PRAGMA_PARAM)\n \tfor (i = 0; i < PACKED_BATCH_SIZE; i++) {\n+#ifndef DISABLE_SWPREFETCH\n \t\trte_prefetch0((void *)(uintptr_t)desc_addrs[i]);\n+#endif\n \t\trte_memcpy(rte_pktmbuf_mtod_offset(pkts[i], void *, 0),\n \t\t\t (void *)(uintptr_t)(desc_addrs[i] + buf_offset),\n \t\t\t pkts[i]->pkt_len);\n@@ -2046,8 +2052,10 @@ virtio_dev_tx_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,\n \tuint32_t remained = count;\n \n \tdo {\n+#ifndef DISABLE_SWPREFETCH\n \t\trte_prefetch0(&vq->desc_packed[vq->last_avail_idx &\n \t\t (vq->size - 1)]);\n+#endif\n \n \t\tif (remained >= PACKED_BATCH_SIZE) {\n \t\t\tif (!virtio_dev_tx_batch_packed(dev, vq, mbuf_pool,\n", "prefixes": [ "v3", "14/15" ] }