Date: Fri, 21 Apr 2006 20:22:28 -0400 From: Erin E Conn <econn@nc.rr.com> To: "R. B. Riddick" <arne_woerner@yahoo.com> Cc: freebsd-multimedia@freebsd.org Subject: Re: Rebooting problems with /dev/cxm0 Message-ID: <44497744.8010609@nc.rr.com> In-Reply-To: <20060419054623.74788.qmail@web30301.mail.mud.yahoo.com> References: <20060419054623.74788.qmail@web30301.mail.mud.yahoo.com>
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> I had a similar problem with my Pentium 133MHz: > When I used "cat /dev/cxm0" and piped it via a NIC to another box, the pvr box > halted without rebooting (at least for some minutes - then i pushed the reset > button). Somehow it felt like the read requests from /dev/cxm0 must be issued > quite often and regularily and the read requests from /dev/cxm0 should not be > limited in size (1MB works fine, while 1 byte crashes almost immediately (e. g. > "dd if=/dev/cxm0 of=/dev/null bs=1 count=1000"))... Furthermore the power > saving features should be disabled in my box, I think (I did not test it > thoroughly - at least whenever the power saving started the box crashed, when I > read from /dev/cxm0 at that time)... :-) > > Since I split the reading from cxm0 and transfering to hard disc (partially via > network) in two processes, that use 8 or about 8 buffers (each 2MB or about > 2MB), I do not have this problem (61 days uptime... :-)) And each day at least > 3h of reading from /dev/cxm0 - at most days much more: 6h or so). > > Maybe that helps (e. g.: just try to do "dd if=/dev/cxm0 of=/dev/null bs=1m > count=1000"). I'm not quite sure I understand what is meant here. My machine does not crash when I try the above dd command, but that may also be simply because at a count of 1000 it's not accessing my card long enough for whatever condition is causing my machine to lock up to occur. I'm trying a longer count now and it has not crashed so far, but I'm not sure how to apply this to practical viewing. How are you splitting the reading into 2 processes, and are you able to watch live TV using this method? Also, I am not using the network in any capacity, everything is happening locally on one machine. --Erin
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