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<DIV><SPAN class=373191216-28072008><FONT face=Arial color=#0000ff size=2>The
code I referred to is the Hobbit code not the RRD stuff. Whilst RRD may well
allow negative numbers it looks like Hobbit is not coded correctly to allow it,
at least not the source code I am looking at. I know that there is an unofficial
patch for Hobbit but have no idea whether the code I am looking at is this
version or not, not if that code has this same bug.</FONT></SPAN></DIV>
<DIV><SPAN class=373191216-28072008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=373191216-28072008><FONT face=Arial color=#0000ff size=2>If you
compiled your own Hobbit then you can follow these instructions to modify the
source:</FONT></SPAN></DIV>
<DIV><SPAN class=373191216-28072008><FONT face=Arial color=#0000ff
size=2>----</FONT></SPAN></DIV>
<DIV><SPAN class=373191216-28072008><FONT face=Arial color=#0000ff size=2>Change
to the Hobbit source directory.</FONT></SPAN></DIV>
<DIV><SPAN class=373191216-28072008><FONT face=Arial color=#0000ff size=2>Edit
the hobbitd/rrd/do_ncv.c file.</FONT></SPAN></DIV>
<DIV><SPAN class=373191216-28072008><FONT face=Arial color=#0000ff size=2>Go to
line 54, which looks like this:</FONT></SPAN></DIV>
<DIV><SPAN class=373191216-28072008><FONT face=Arial color=#0000ff
size=2>
l = val + strspn(val, "0123456789.");<BR></FONT></SPAN></DIV>
<DIV><SPAN class=373191216-28072008><FONT face=Arial color=#0000ff size=2>Add a
- after the . so it looks like this:</FONT></SPAN></DIV>
<DIV><SPAN class=373191216-28072008><FONT face=Arial color=#0000ff
size=2>
l = val + strspn(val, "0123456789.-");<BR></FONT></SPAN></DIV>
<DIV><SPAN class=373191216-28072008><FONT face=Arial color=#0000ff
size=2>Compile and install as per standard instructions.</FONT></SPAN></DIV>
<DIV><SPAN class=373191216-28072008><FONT face=Arial color=#0000ff
size=2>----</FONT></SPAN></DIV>
<DIV><SPAN class=373191216-28072008><FONT face=Arial color=#0000ff
size=2> </DIV></FONT></SPAN>
<DIV><SPAN class=373191216-28072008><FONT face=Arial color=#0000ff
size=2>|\/|artin</FONT></SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV></DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><FONT
face=Tahoma size=2>-----Original Message-----<BR><B>From:</B> Ralph Mitchell
[mailto:ralphmitchell@gmail.com] <BR><B>Sent:</B> 28 July 2008
16:18<BR><B>To:</B> hobbit@hswn.dk<BR><B>Subject:</B> Re: [hobbit] No graph
for negative clock offset<BR><BR></FONT></DIV>
<DIV dir=ltr>Judging by the man page, negative values are OK. The first
entry in the EXAMPLE section of "man rrdcreate" reads:<BR><BR>
rrdtool create temperature.rrd --step 300
\<BR>
DS:temp:GAUGE:600:-273:5000 \<BR>
RRA:AVERAGE:0.5:1:1200
\<BR>
RRA:MIN:0.5:12:2400 \<BR>
RRA:MAX:0.5:12:2400 \<BR>
RRA:AVERAGE:0.5:12:2400<BR><BR>
This sets up an RRD called temperature.rrd which accepts one
tempera-<BR> ture value every 300
seconds. If no new data is supplied for more than<BR>
600 seconds, the temperature becomes *UNKNOWN*. The
minimum acceptable<BR> value
is -273 and the maximum is 5'000.<BR><BR>Ralph Mitchell<BR><BR><BR>
<DIV class=gmail_quote>On Mon, Jul 28, 2008 at 9:24 AM, Ward, Martin <SPAN
dir=ltr><<A
href="mailto:Martin.Ward@colt.net">Martin.Ward@colt.net</A>></SPAN>
wrote:<BR>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">Funnily
enough I am looking at the Hobbit code that deals with RRD data<BR>at the
moment. If you are using the NCV capabilities then it looks like<BR>you
can't have negative numbers. The generic NCV (Number, Colon, Value)<BR>code
looks for numbers only, no signs (somewhere near line 70
in<BR>hobbitd/rrd/do_ncv.c):<BR><BR>
val = l + strspn(l, "
\t");<BR>
l = val + strspn(val, "0123456789.");<BR><BR>I have no
idea if RRD is able to accept/store negative values, but if it<BR>is, it
should be a simple case of adding the + and - characters to the<BR>last line
listed above to make what you want possible.<BR><BR>|\/|artin<BR>
<DIV>
<DIV></DIV>
<DIV class=Wj3C7c><BR>-----Original Message-----<BR>From: David Stuffle
[mailto:<A
href="mailto:david@stufflemail.com">david@stufflemail.com</A>]<BR>Sent: 28
July 2008 14:28<BR>To: <A
href="mailto:hobbit@hswn.dk">hobbit@hswn.dk</A><BR>Subject: [hobbit] No
graph for negative clock offset<BR><BR><BR>Hi all,<BR>None of my clock
offset graphs graph anything when the clock offset from<BR><BR>a host is a
negative number. Only positive number work. Anyone having<BR>the
same thing happen or know how to fix?<BR><BR>I'm running a snapshot
4.3.0-0.20080103<BR><BR>Thanks<BR>David<BR><BR><BR>To unsubscribe from the
hobbit list, send an e-mail to<BR><A
href="mailto:hobbit-unsubscribe@hswn.dk">hobbit-unsubscribe@hswn.dk</A><BR><BR><BR><BR><BR></DIV></DIV>*************************************************************************************<BR>The
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