2021-12-31 15:02 GMT+08:00, Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx>: > 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) linux kdiskmark, windows crystaldiskmark > 2) If you're using the same application, are you using the same test > parameters and version? kdiskmark and crystaldiskmark used same parameters, seq1M Q8T1, linux 500MB/s, windows 1000MB/s. > 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.) >
