在「Varnish Software Achieves 500Gbps Throughput Per Server for UHD Video Content」這邊看到 PR 稿，由 Intel 與 Varnish 合作，宣稱達到單機 500Gbps 的 throughput 了：

According to Varnish Software, the following were the outcomes of the test:

• 509.7 Gbps live-linear throughput, using a dual-processor configuration
• 487.2 Gbps video-on-demand throughput, using a dual-processor configuration

白皮書在「Delivering up to 500 Gbps Throughput for Next-Gen CDNs」這頁可以用個資交換下載，不過用搜尋引擎找一下可以發現 Intel 那邊有放出 PDF (但不確定兩邊給的是不是同一份)：「Delivering up to 500 Gbps Throughput for Next-Gen CDNs」。

單 CPU 的伺服器是四個 100Gbps 界面接出來，雙 CPU 的伺服器是八個 (這邊 SUT 是 system under test 的縮寫)：

These client systems were connected to the CDN servers using 100 GbE links through a switch; 4x100 GbE connections for the single-processor SUT, and 8x100 GbE for the dualprocessor SUT. Testing was done using Wrk, a widely recognized open-source HTTP(S) benchmarking tool.

不過如果實際看圖會發現伺服器是兩個 100Gbps (單 CPU) 與四個 100Gbps (雙 CPU)，然後 wrk 也吃了兩個或是四個 100Gbps：

在白皮書最後面也有提到測試的配置，都是在 Ubuntu 20.04 上面跑，單 CPU 用的是兩張 Intel 的 100Gbps 網卡，雙 CPU 的用的是四張 Mellanox 的 100Gbps 網卡：

3rd generation Intel Xeon Scalable testing done by Intel in September 2021. Single processor SUT configuration was based on the Supermicro SMC 110P-WTR-TNR single socket server based on Intel® Xeon® Platinum 8380 processor (microcode: 0xd000280) with 40 cores operating at 2.3 GHz. The server featured 256 GB of RAM. Intel® Hyper-Threading Technology was enabled, as was Intel® Turbo Boost Technology 2.0. Platform controller hub was the Intel C620. NUMA balancing was enabled. BIOS version was 1.1. Network connectivity was provided by two 100 GbE Intel® Ethernet Network Adapters E810. 1.2 TB of boot storage was available via an Intel SSD. Application storage totaled 3.84TB per drive and was provided by 8 Intel P5510 SSDs. The operating system was Ubuntu Linux release 20.04 LTS with kernel 5.4.0-80 generic. Compiler GCC was version 9.3.0. The workload was wrk/master (April 17, 2019), and the version of Varnish was varnishplus-6.0.8r3. Openssl v1.1.1h was also used. All traffic from clients to SUT was encrypted via TLS.

3rd generation Intel Xeon Scalable testing done by Intel in September 2021. Dual processor SUT configuration was based on the Supermicro SMC 22OU-TNR dual socket server based on Intel® Xeon® Platinum 8380 processor (microcode: 0xd000280) with 40 cores operating at 2.3 GHz. The server featured 256 GB of RAM. Intel® Hyper-Threading Technology was enabled, as was Intel® Turbo Boost Technology 2.0. Platform controller hub was the Intel C620. NUMA balancing was enabled. BIOS version was 1.1. Network connectivity was provided by four 100 GbE Mellanox MCX516A-CDAT adapters. 1.2 TB of boot storage was available via an Intel SSD. Application storage totaled 3.84TB per drive and was provided by 12 Intel P5510 SSDs. The operating system was Ubuntu Linux release 20.04 LTS with kernel 5.4.0-80- generic. Compiler GCC was version 9.3.0. The workload was wrk/master (April 17, 2019), and the version of Varnish was varnish-plus6.0.8r3. Openssl v1.1.1h was also used. All traffic from clients to SUT was encrypted via TLS.

不過馬上就會滿頭問號，四張 100Gbps 是怎麼跑到 500Gbps 的頻寬...

這份 PR 馬上就讓人想到 Netflix 先前放出來的投影片 (先前有在「Netflix 在單機服務 400Gbps 的影音流量」這篇提到)，在 Netflix 的投影片裡面有提到他們在 Intel 平台上面受限於記憶體的頻寬，整台機器只能跑到 230Gbps。

另外一種猜測是，如果 Intel 與 Varnish 宣稱的 500Gbps 是算 switch 上的總流量 (有這樣算的嗎，你是 Juniper 嗎...)，那這邊的 500Gbps 換算回去差不多就是減半 (還很客氣的沒把 cache 沒中需要去 origin server 拉資料的流量扣掉)，跟 Netflix 在 FreeBSD 上跑出來的結果差不多啊...

坐等反駁 XDDD