-Original Message-
From:
[EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
.org] On Behalf Of [EMAIL PROTECTED]
Sent: Monday, January 07, 2008 5:21 AM
To: nut-upsuser@lists.alioth.debian.org
Subject: [Nut-upsuser] Working platform with FreeBSD + USB +
MGE Ellipse(usbhid-ups)
Hi,
I've have had some difficulties to run NUT on freebsd, but I
finally managed to have something that work reliably enough.
For those who may be interested, here is what I did.
Os: FreeBSD 6.2-RELEASE-p7, nut: 2.2.0, libusb: 0.1.12
First, I had to patch libusb with the changes submitted by
Nevil Thatcher in the nutups forum in may 2006. Without this
change, nothing works.
(http://lists.alioth.debian.org/pipermail/nut-upsuser/2006-May
/000992.html)
At this point, I had something that more or less works, but
the USB connection drops occasionaly for some reasons, and
won't recover. I did not trace it enough to see what happens,
but it seems that something occurs in freebsd kernel layers
that bubbles to the reading process as an IO error (errno=EIO=5).
The reason why it does not recover is still somehow obscurs
to me, but I'm pretty much convinced it is related to the way
the libusb layer deal with re-initialization. I'm new to this
library, but it looks like the function usb_init(); (and
friends) is not designed to run more than once in the process
lifetime.
Instead of fixing those parts, which would have taken a lot
of time, I used another approach: I implemented a respawn
option for the driver process, which automatically restarts
the process when it exits. I also did a few changes in the
driver code so that it exits whenever a USB connection problem occurs.
At this point, I have something that works reliably enough.
Using my UPS (MGE ellipse 750), I see about 20 losses of
connection per day, and the system takes between 5 and 10s to recover.
I did another change which is more cosmetic than anything
else. In order to keep short reconnections silents (in my
logging system), I added a grace period that delays the
COMMBAD event. If the system recovers before this period, no
event is issued.
- Hervé
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