Date: Sat, 15 Jan 2011 00:04:29 -0500 From: dieterbsd@engineer.com To: hselasky@c2i.net, freebsd-questions@freebsd.org, freebsd-usb@freebsd.org, freebsd-firewire@freebsd.org Cc: freebsd@sopwith.solgatos.com Subject: Re: lock contention problem? Message-ID: <8CD8288D3167A65-FC4-3504F@web-mmc-m06.sysops.aol.com>
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> It might be a hardware resource starvation problem. It is possible to=20 nice > umass by simply adding a line like: > > .interval =3D 2, /* 2 milliseconds */ Thanks, but it didn't help. Also tried setting it to 1, 4, and 20. > http://svn.freebsd.org/changeset/base/217350 Is this supposed to work for 8.0? Is there more to it than a couple line change in a .h file? /usr/src/sys/dev/usb/controller/usb_controller.c: In function=20 'usb_attach_sub': /usr/src/sys/dev/usb/controller/usb_controller.c:434: warning: implicit=20 declaration of function 'PI_SWI' /usr/src/sys/dev/usb/controller/usb_controller.c:434: warning: nested=20 extern declaration of 'PI_SWI' I'm feeding "fwcontrol -u 1 -S /dev/stdin" from a pipe. The write() to the pipe took over a second. Perhaps connected to the lock=20 contention of over a second? The EAGAIN comes from the writev() roughly 20 lines from the end of /usr/src/usr.sbin/fwcontrol/fwdv.c. CPU is 98% idle. Data rate is only 3.4 MiB/second.
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