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)
>
> 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
my kernel config #CONFIG_USB_UAS is not set.
> 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.
CONFIG_USB_UAS=y
[ 524.630081] usb 4-1: new SuperSpeed Plus Gen 2x1 USB device number
5 using xhci_hcd
[ 524.747496] scsi host9: uas
[ 524.757580] scsi 9:0:0:0: Direct-Access Realtek USB 3.2 Device
1.00 PQ: 0 ANSI: 6
Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 20000M/x2
|__ Port 1: Dev 2, If 0, Class=Mass Storage, Driver=uas, 10000M
windows fat32 speed, https://imgur.com/a/eq9qhKj
linux ext4 speed, https://imgur.com/a/tUAskgV
> 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.)
>
