You might still be using the Metronome driver from EmbeddedPkg instead
of MdeModulePkg. That will for example cause gBS->Stall to take much
longer than it should.
--
Rebecca Cran
On 1/8/23 03:41, tinhnguyen via groups.io wrote:
Hi RichardHo,
This driver has interested me.
I've ported your driver to tinh_ampere_edk2
<https://github.com/tinhnampere/edk2/tree/support_usbnet> and
tinh_ampere_edk2_platform
<https://github.com/tinhnampere/edk2-platforms/tree/support_usbnet>.
I'm having the same issue with our USB CDC ECM driver, which we've
already published here Ampere USB CDC Net
<https://github.com/AmpereComputing/edk2-platforms/tree/ampere/Platform/Ampere/AmperePlatformPkg/Drivers/UsbCdcEthernetDxe>.
That is a bug in polling performance; we also have a thread with the
same issue USB Net for Aarch64 platform
<https://edk2.groups.io/g/devel/topic/30905775#9791,>
Currently, on the Jade platform (use your USB net driver), performance
is quite low and the OS cannot be booted.
The root cause is that we spend a long time waiting for USB
UsbBulkTransfer to complete, but if there is no data to communicate
-> it will always time out.
I have no idea why the polling time of MNP is 10 ms
#defineMNP_SYS_POLL_INTERVAL(10 * TICKS_PER_MS)// 10 milliseconds,
But I don't see why it should be changed; it could have some unexpected
consequences for other platforms.
I have a workaground for Ampere usb net driver: /I include a function
like "filter," "slow down," or something similar. If there are a lot of
transaction timeouts, I reject some income requests from the upper
layer. I've already tried it on your driver /tinh_ampere_edk2
<https://github.com/tinhnampere/edk2/tree/support_usbnet>/, and it works ./
/
/Anyway, hope you can solve this problem; I think many platforms are
experiencing the same issue.
Thanks,
Tinh Nguyen
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