![]() Prior to Pi 4, the USB host controller software did not support DMA scatter-gather operations. This post details why there is a difference in behaviour from models prior to Pi 4 and the recommended workaround. We have seen reports of extremely degraded performance when using several types of USB3.0 to SSD adapter or when using native USB3.0 disk drives. how_to_use and 1008 as per sabrent website, but it has no effect. I tried updating the Sabrent interface to both v0.1.1.4 as per. Speaking of the Sabrent, speeds are 400-500Mb/Sec on a Windows machine. Sabrent EC-UASP enclosure (JMS=578 chipset), and a Ugreen USB3.1. Could this be a driver's issue or hardware fault? ![]() Sync dd if=/dev/zero of=tempfile bs=1M count=1024 syncġ073741824 bytes (1.1 GB, 1.0 GiB) copied, 30.7906 s, 34.9 MB/sĬan you think of what could be causing it? I'm trying two different enclosures and two different ssd drives, and the USB3 port write speeds have the same speed as the USB2 port on my pi400.īoth enclosures and drives appear to have good speeds when running hdparm, (742MB/Sec / 357 MB/Sec) but are much slower using: ![]() Working well by reinstalling retropie 4.7.1 and booting from the ssd directly $ sync dd if=/dev/zero of=tempfile bs=1M count=1024 syncġ073741824 bytes (1.1 GB, 1.0 GiB) copied, 4.46093 s, 241 MB/sĪlso noticed the Sabrent enclosure was giving me i/o errors even after firmware update, whereas the ugreen works flawlessly after adding the trim rule to enable trim. ![]()
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