标杆家的无缓——Samsung9801TB评测
一、前言自从上次测完西数的SN570之后，我本以为西数的Dramless盘的性能不过如此，就找了消费级固态界的标杆——三星，测一测它新推出的Dramless盘980的实际性能如何，话不多说，开测！
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盘体：
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主控表面镀了层镍，背面的贴纸也有铜箔，以辅助散热。同时，颗粒和主控分列两端，避免了热量的过度集中。
由于是自费购买的硬盘，后续会挂小黄鱼出售，就不揭开贴纸了，三星贴纸四个角上边有“T”字样，撕掉后无法完美还原。 <div id="post_content_143117904303" class="d_post_content j_d_post_contentclearfix" > 三、基本信息
惯例，到手上机先看CDI
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CDI抓取到的smart的信息较为有限，故使用smartmontools进一步抓取主控的smart信息。如下所示：https://geekbbs.cn/source/plugin/csdn123com_zhuanzai/display_picture.php?url=http%3A%2F%2Ftiebapic.baidu.com%2Fforum%2Fw%253D580%2Fsign%3D6cec5935e3096b6381195e583c328733%2F48414782b2b7d0a26a5e9a8796ef76094a369a8f.jpg点击展开，查看完整图片 四、测试平台及设置
Hardware：AMD Ryzen 3700X @ 4.4GHz
Motherboard：Micro Star X570 Gaming Plus（BIOS Verizon：7C37vAE）
System：Windows 10 Professional 20H2 / Centos 8.4.2105
Heatsink：Thermalright TR-M.2 2280
IO Interface：M2_1 slot (From AMD® Processor)
裸盘（Without Heatsink）：即盘本身；带散热器（With Heatsink）：在原有的基础上加上Thermalright TR-M.2 2280散热器。 五、基本性能测试
①Without Heatsink
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②With Heatsinkhttps://geekbbs.cn/source/plugin/csdn123com_zhuanzai/display_picture.php?url=http%3A%2F%2Ftiebapic.baidu.com%2Fforum%2Fw%253D580%2Fsign%3D4313a7de6cadcbef01347e0e9cae2e0e%2F5944426034a85edf1e00603914540923dc547596.jpg
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在Windows下分别对裸盘及加装散热器片的980 1T进行了CDM/ASS/HD Tune/PCM8的测试，由于Windows下几个跑分项目负载较低，四个项目的测试结果相差不大。根据HD Tune测试的结果可知，980的SLC Cache达到了165GB，缓外速度约为500MB/s，此时的缓外速度属于主控在后台边进行垃圾回收（GC）边对颗粒进行写入。 六、进阶性能验证
为了进一步测试该盘的实际性能情况，在Centos环境下采用FIO对硬盘进行持续和全面的性（大）能（保）测（健）试，同时也是对硬盘极限性能进行一个标定。
(1)全盘读写
首先肯定是来一套全盘读写项目
①Without Heatsink
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在全盘读写测试环节中，裸盘和加散热片的情况没有较大的区别。两种散热情况缓外均未进入TLC颗粒的直写速度，这种现象是由于主控在后台进行垃圾回收（GC）所导致的，真实的颗粒直写速度将会在后续进行进一步的说明。同时，全盘的写入速度和读取速度均呈阶梯状逐步提高，有点魔幻。 (2)4KiB全盘跨度随机读写（QD1T1）
①Without Heatsink
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②With Heatsinkhttps://geekbbs.cn/source/plugin/csdn123com_zhuanzai/display_picture.php?url=http%3A%2F%2Ftiebapic.baidu.com%2Fforum%2Fw%253D580%2Fsign%3Da6d04b165ed5ad6eaaf964e2b1c939a3%2F52305da98226cffc6adccf60fc014a90f403eae0.jpg
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(3)4KiB全盘跨度随机读写（QD32T4）
①Without Heatsink
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980作为一款Dramless盘，4KiB全盘跨度随机读写性能并不算出众，但是随机读写都做到了一定程度的收敛，QoS（99%/99.9%/99.99%）的延迟表现在Dramless盘里边还算可以。且在加装散热片后，最大延迟相比裸盘情况略有降低。 (4)4KiB全盘跨度随机7读3写（QD32T4）
①Without Heatsink
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4KiB全盘跨度下的随机7读3写在一定的范围内上下波动，随机读取和随机写入都能够做到一定程度的收敛。裸盘和加装散热片后对4KiB全盘跨度随机7读3写影响不大，但加装散热片后最大延迟得到了一定程度的下降。 (5)SLC Cache写入测试
在此阶段，分别对硬盘进行20%/40%/60%/80%的预填充，静置15min让主控进行GC(Garbage Collection)操作，然后再对剩余空间进行顺序写入，测试其缓内及缓外顺序写入情况。
①预填充20%
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由测试结果来看，裸盘和加装散热片的写入情况趋于一致。预填充20%时SLC Cache的大小为80GiB；预填充40%时SLC Cache的大小为49GiB左右；预填充超过60%时，SLC Cache并未得到有效的释放。且缓外的速度均为主控一边进行垃圾回收（GC）一边对颗粒进行写入的速度，未进入到真实的TLC颗粒直写速度。 (6)稳态顺序读写
根据SNIA发布的《Solid State Storage Performance Test Specification》中写道，固态一般分为以下三个阶段：FOB、Transition和Steady State。
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故在此阶段，先对Samsung 980 1TB进行了一次全盘顺序写入后，进行顺序写入1800s和顺序读取1800s测试项目。
结果如下：
①Without Heatsink
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②With Heatsinkhttps://geekbbs.cn/source/plugin/csdn123com_zhuanzai/display_picture.php?url=http%3A%2F%2Ftiebapic.baidu.com%2Fforum%2Fw%253D580%2Fsign%3D0d3f19d11e166d223877159c76220945%2Fd05fd85c10385343a336193bce13b07ecb8088a1.jpg在长时间稳态顺序读写中，裸盘和加装散热片的结果趋于一致，并未出现明显的降速，由此可见980的发热及功耗尚可。同时，在长时间的稳态写入中可以得知三星980的TLC颗粒直写速度为959MiB/s（1006MB/s）。