Matthew Dharm wrote:
I enabled usb storage debugging and now I get a lot of messages. It seems to me that part of the traced information is lost e.g. there is a message "kernel: <>[ 125.105000] usb-stora transfer result 0x0" which seems to have some characters missing.It would be interesting to turn on CONFIG_USB_STORAGE_DEBUG and capture the debugging output.Matt On Tue, Jul 31, 2007 at 08:37:31PM +0100, Kostas Peletidis wrote: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)? MattHi 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------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
I noticed that now top shows roughly 33%us and 67%sy usage(no waiting percentage this time, however the problem is still there) probably because the debugging code uses a lot of cpu time.Apart from that I see quite a lot of "usb-storage: Attempting to get CSW..." messages.
I don't know what to look for so perhaps I missed some more important messages. Can you please have a look at the attached file? Thank you.
Regards, Kostas
messages.bz2
Description: application/bzip
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