Hello Julien, On 10/26/17 13:05, Julien Grall wrote: > Hi all, > > I was doing more testing of UEFI in Xen guests and noticed some slow > down when using the shell. The characters are only echoed after a second > or two that is a bit annoying. > > The change that introduced this issue is 4cf3f37c87 "MdeModulePkg > SerialDxe: Process timeout consistently in SerialRead". > > The Serial Driver for Xen PV console is very simple (see > OvmfPkg/Library/XenConsoleSerialPortLib). So I am not sure where the > root cause is. > > Would anyone have any tips on it?
The exact same issue has been encountered earlier under QEMU, please refer to the following sub-thread (please read it to end): http://mid.mail-archive.com/[email protected] The fix was commit 5f0f5e90ae8c ("ArmVirtPkg/FdtPL011SerialPortLib: call PL011UartLib in all SerialPortLib APIs", 2017-08-16). I think if you can implement the same for XenConsoleSerialPortLib, that should return to working state as well. ... This is why we need active Xen participants in edk2 ;) Thanks! Laszlo _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
