On Nov 25, 2013, at 4:56 PM, Fabio Cecamore wrote: > Hi all, > after a change of UPS (to Atlantis Host Power 851) I began to use the new > driver blazer_usb and compared to old one (blazer used with serial > connection) I noted more CPU use and errors in dmesg: > > [...] > [256712.584370] usb 4-5: usbfs: USBDEVFS_CONTROL failed cmd blazer_usb rqt 33 > rq 9 len 8 ret -110
"ret -110" is a timeout, I believe. > Obviously the usb ports work good, I think is a bug in the driver or > something like.. Could be a cable problem, too. What version of NUT? We increased the timeout in 2.7.1. Also, devices that talk to blazer_usb are basically serial UPSes with a USB-to-serial converter. The increased CPU usage is not surprising, since the host now has to poll the USB-to-serial converter (rather than the UART interrupting the CPU when data is ready). Do you have any profiling data to show how much more CPU time is being used? -- Charles Lepple clepple@gmail _______________________________________________ Nut-upsuser mailing list [email protected] http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/nut-upsuser
