youling 257 wrote: > 2021-12-31 11:46 GMT+08:00, Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx>: >> Hi, >> >> youling 257 wrote: >>> test this patch, cat /sys/bus/usb/devices/4-1/speed, 10000 >>> [ 74.694284] usb 4-1: new SuperSpeed Plus Gen 2x1 USB device number >>> 2 using xhci_hcd >>> [ 74.750329] usb-storage 4-1:1.0: USB Mass Storage device detected >>> >>> but speed, pcie to usb3.2 gen2x2, WRITE: bw=642MiB/s (673MB/s), >>> 642MiB/s-642MiB/s (673MB/s-673MB/s), io=1000MiB (1049MB), >>> run=1557-1557msec >>> READ: bw=467MiB/s (490MB/s), 467MiB/s-467MiB/s (490MB/s-490MB/s), >>> io=1000MiB (1049MB), run=2140-2140msec >>> >>> the mainboard usb3.2 gen2x1, WRITE: bw=838MiB/s (878MB/s), >>> 838MiB/s-838MiB/s (878MB/s-878MB/s), io=1000MiB (1049MB), >>> run=1194-1194msec >>> READ: bw=753MiB/s (790MB/s), 753MiB/s-753MiB/s (790MB/s-790MB/s), >>> io=1000MiB (1049MB), run=1328-1328msec >>> >> >> Let's avoid top-post. >> >> Some comments: >> 1) Just because the host is capable of gen2x2, it doesn't mean it will >> run at gen2x2 speed. Your device can only operate up to gen2x1 speed, so >> that's the limit. The test speed for gen2x1 above is not unreasonable. > my device can only operate up to gen2x1 10gbps speed on window, only > 5gbps on linux kernel 5.16rc7. With the change I provided, you were able to run test at gen2x1, albeit slower than expect. (i.e. write speed at 673MB/s for ASmedia host must be SSP). The issue with device unable to operate at SSP is at least answered. If you're looking to find out why the performance is slow, confirm these items first: 1) Are you using the same application to test on Linux to compare with Windows? (Looks like you're using CrystalDiskMark for your Windows test) 2) If you're using the same application, are you using the same test parameters and version? 3) Is your device operating in BOT or UASP in Linux? UAS Protocol is generally faster. Newer device generally uses UASP, and I assume yours is a newer device (check your enclosure). Make sure there's no quirk preventing the device operating in UASP. If all of those are checked out, you can start capturing logs so others may look into it. BR, Thinh (btw, I'll be on vacation for a week, maybe others can help while I'm away.)
