Aubrey Li :
Strony Zhang <> wrote:
The reason is that ehci_handle_root_hub_status_change() in ehci driver is
called once every 256 ms to poll the ehci root hub or port status change.
The fix way is to change the polling to the interrupter-driven. Fortunately,
there is a corresponding interrupt enable bit(Port Change Interrupt Enable)
offered in the ehci interrupt register. It will be supported to fix the
issue.
Regards,
Strony
This might be one of the causes. 256ms is long enough to let CPUs enter
deep package C-state. I guess there must be some other activities from USB.
If you can build a driver or make a patch, I'd like to have a try.
Which Solaris version are you using?
BTW, is there a CR number of this issue? Or do you need me to file one?
6829271
Regards,
Strony
Thanks,
-Aubrey
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