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 EE501A00BE; Wed, 29 Apr 2020 03:04:40 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id BEFDE1D6D3; Wed, 29 Apr 2020 03:04:34 +0200 (CEST) Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by dpdk.org (Postfix) with ESMTP id BA83D1D6AE for ; Wed, 29 Apr 2020 03:04:31 +0200 (CEST) IronPort-SDR: 9J6a7dtkWwHwcCMIO+01lKldUQC8IHRqxpUILJ5kxgGqmsEJqqjcozVBYVAnk8N+N6qBBLHx36 LZ1aCj01tbLA== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Apr 2020 18:04:31 -0700 IronPort-SDR: i1GJ0GO7wG6f6NzIz0hr7HxdE/qXQIS2COU4bypxZmE1BGlbAa611CbtiYyH+ybwX7DrJdNgvD EumNufzq0nYA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,329,1583222400"; d="scan'208";a="459009789" Received: from npg-dpdk-virtual-marvin-dev.sh.intel.com ([10.67.119.56]) by fmsmga005.fm.intel.com with ESMTP; 28 Apr 2020 18:04:29 -0700 From: Marvin Liu To: maxime.coquelin@redhat.com, xiaolong.ye@intel.com, zhihong.wang@intel.com Cc: dev@dpdk.org, Marvin Liu Date: Wed, 29 Apr 2020 09:04:22 +0800 Message-Id: <20200429010422.22303-2-yong.liu@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200429010422.22303-1-yong.liu@intel.com> References: <20200316153353.112897-1-yong.liu@intel.com> <20200429010422.22303-1-yong.liu@intel.com> Subject: [dpdk-dev] [PATCH v4 2/2] vhost: binary search address mapping table 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" If Tx zero copy enabled, gpa to hpa mapping table is updated one by one. This will harm performance when guest memory backend using 2M hugepages. Now utilize binary search to find the entry in mapping table, meanwhile set the threshold to 256 entries for linear search. Signed-off-by: Marvin Liu diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h index 507dbf214..998e133ad 100644 --- a/lib/librte_vhost/vhost.h +++ b/lib/librte_vhost/vhost.h @@ -546,20 +546,48 @@ extern int vhost_data_log_level; #define MAX_VHOST_DEVICE 1024 extern struct virtio_net *vhost_devices[MAX_VHOST_DEVICE]; +#define VHOST_BINARY_SEARCH_THRESH 256 + +static __rte_always_inline int guest_page_addrcmp(const void *p1, + const void *p2) +{ + const struct guest_page *page1 = (const struct guest_page *)p1; + const struct guest_page *page2 = (const struct guest_page *)p2; + + if (page1->guest_phys_addr > page2->guest_phys_addr) + return 1; + if (page1->guest_phys_addr < page2->guest_phys_addr) + return -1; + + return 0; +} + /* Convert guest physical address to host physical address */ static __rte_always_inline rte_iova_t gpa_to_hpa(struct virtio_net *dev, uint64_t gpa, uint64_t size) { uint32_t i; struct guest_page *page; - - for (i = 0; i < dev->nr_guest_pages; i++) { - page = &dev->guest_pages[i]; - - if (gpa >= page->guest_phys_addr && - gpa + size < page->guest_phys_addr + page->size) { - return gpa - page->guest_phys_addr + - page->host_phys_addr; + struct guest_page key; + + if (dev->nr_guest_pages >= VHOST_BINARY_SEARCH_THRESH) { + key.guest_phys_addr = gpa; + page = bsearch(&key, dev->guest_pages, dev->nr_guest_pages, + sizeof(struct guest_page), guest_page_addrcmp); + if (page) { + if (gpa + size < page->guest_phys_addr + page->size) + return gpa - page->guest_phys_addr + + page->host_phys_addr; + } + } else { + for (i = 0; i < dev->nr_guest_pages; i++) { + page = &dev->guest_pages[i]; + + if (gpa >= page->guest_phys_addr && + gpa + size < page->guest_phys_addr + + page->size) + return gpa - page->guest_phys_addr + + page->host_phys_addr; } } diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c index 79fcb9d19..15e50d27d 100644 --- a/lib/librte_vhost/vhost_user.c +++ b/lib/librte_vhost/vhost_user.c @@ -965,6 +965,12 @@ add_guest_pages(struct virtio_net *dev, struct rte_vhost_mem_region *reg, reg_size -= size; } + /* sort guest page array if over binary search threshold */ + if (dev->nr_guest_pages >= VHOST_BINARY_SEARCH_THRESH) { + qsort((void *)dev->guest_pages, dev->nr_guest_pages, + sizeof(struct guest_page), guest_page_addrcmp); + } + return 0; } -- 2.17.1