Poor performance (i/o?)

PerpetualCycle · Jul 10, 2021

@Cliff S got me looking at this - I have been focused on the functionality, not performance

In most things I am seeing poorer performance in Windows 11 vs. Windows 10. NVME disk benchmarks are down from 3000-3500 MB/s to around 1800 MB/s. Benchmarks like Realbench 2.56 really suffer. For instance the image editing portion of Realbench in Windows 11 takes 37 seconds, way up from 22 seconds Windows 10. Some benchmarks, like x264 encoding and Cinebench, which are pretty much pure CPU, are about the same. 3D games play without any performance loss.

Windows don't open as quickly, even though I have a RAM cache in front of them - just not snappy.

Was wondering what others are measuring and experiencing.

SylenThunder · Jul 10, 2021

I've just been doing my usual daily stuff. 20 browser tabs, 4 security camera feeds, one or two RDP sessions, a game, streaming movies, ect.

I have noticed that it does seem to hitch up quite a bit, but I have not yet narrowed down where the bottleneck is. It's especially noticeable when I am playing a dx11/12 game and watching a video or browsing.

bobkn · Jul 11, 2021

I ran CrystalDisk Mark 8.01 under Win10 and Win11. The Wind 11 benches were as good as the Win10 ones, with the exception of one of the "random write" ones.

The drive is a WD Black SN850.

Windows 10:

[Read]
SEQ 1MiB (Q= 8, T= 1): 6926.383 MB/s [ 6605.5 IOPS] < 1059.34 us>
SEQ 128KiB (Q= 32, T= 1): 6897.857 MB/s [ 52626.5 IOPS] < 588.81 us>
RND 4KiB (Q= 32, T=16): 3723.903 MB/s [ 909156.0 IOPS] < 545.31 us>
RND 4KiB (Q= 1, T= 1): 80.308 MB/s [ 19606.4 IOPS] < 50.91 us>

[Write]
SEQ 1MiB (Q= 8, T= 1): 5068.118 MB/s [ 4833.3 IOPS] < 1642.99 us>
SEQ 128KiB (Q= 32, T= 1): 4979.770 MB/s [ 37992.6 IOPS] < 841.15 us>
RND 4KiB (Q= 32, T=16): 2175.259 MB/s [ 531069.1 IOPS] < 961.03 us>
RND 4KiB (Q= 1, T= 1): 159.707 MB/s [ 38991.0 IOPS] < 25.54 us>

Profile: Default
Test: 1 GiB (x5) [C: 23% (216/931GiB)]
Mode: [Admin]
Time: Measure 5 sec / Interval 5 sec
Date: 2021/06/21 1:58:50
OS: Windows 10 Professional [10.0 Build 19043] (x64)

Windows 11:

[Read]
SEQ 1MiB (Q= 8, T= 1): 6991.270 MB/s [ 6667.4 IOPS] < 1198.66 us>
SEQ 128KiB (Q= 32, T= 1): 6940.013 MB/s [ 52948.1 IOPS] < 603.91 us>
RND 4KiB (Q= 32, T=16): 3972.740 MB/s [ 969907.2 IOPS] < 510.95 us>
RND 4KiB (Q= 1, T= 1): 82.052 MB/s [ 20032.2 IOPS] < 49.83 us>

[Write]
SEQ 1MiB (Q= 8, T= 1): 5201.058 MB/s [ 4960.1 IOPS] < 1610.18 us>
SEQ 128KiB (Q= 32, T= 1): 5141.858 MB/s [ 39229.3 IOPS] < 814.54 us>
RND 4KiB (Q= 32, T=16): 1403.244 MB/s [ 342588.9 IOPS] < 1454.18 us>
RND 4KiB (Q= 1, T= 1): 206.740 MB/s [ 50473.6 IOPS] < 19.70 us>

Profile: Default
Test: 1 GiB (x5) [C: 11% (103/931GiB)]
Mode: [Admin]
Time: Measure 5 sec / Interval 5 sec
Date: 2021/07/11 0:11:50
OS: Windows 10 Professional [10.0 Build 22000] (x64)

Do I know what this means? Not really. I can't even guess whether it's real, or an artifact of the test.