Matthew Dharm wrote:
Did you change any USB-related compile options between the two builds?Do you have usb device suspend enabled? Can you tell (via top) where the 100% CPU usage is coming from (i.e. df, usb-storage thread, syswait, etc)? Matt
Hi Matt,The most relevant USB configuration option I changed seems to be "CONFIG_USB_DEVICE_CLASS=y". I have also added module support for CONFIG_USB_USBNET but I don't think this is related. Please find attached the kernel configuration.
USB suspend is disabled (# CONFIG_USB_SUSPEND is not set) and when I run top and press Shift+P I see that df is at the top of the list, followed by Xorg and usb-storage. The load average reaches 1.17. Interestingly enough, when df is at the top of the list I see roughly "90%wa" which I presume means the CPU spends most of the time waiting. Here are the times derived from "time df":
real 1m4.612s user 0m0.006s sys 0m2.867sIt is worth mentioning that the problem happens only the first time I run df. Subsequent runs of df work normally. If I unmount the disk and remount it I see the same problem.
Regards, Kostas
config-2.6.22.1-zeus.bz2
Description: application/bzip
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