making "longer" graphs produces 'blocky' results

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Subject: making "longer" graphs produces 'blocky' results
From: Andrew Fort (afort@staff.webcentral.com.au)
Date: Mon Oct 02 2000 - 00:30:08 CDT 

Warning, I'm a RRDtool beginner, but couldn't find anything directly in the
documentation about this.. It may be a common problem for FlowScan users, so
here goes:

- I've modified Dave's example Makefile to produce a graph for 2 weeks,
instead of 2 days.  The .png produced appears quite "blocky".  The exact
modification made is

I've added a directive

past_fortnight = $$($(perl) -e 'print time - $(week)*2*60*60')

to the makefile, then changed the build line to 

smtp_Mbps.png: smtp_dst.rrd smtp_src.rrd
        $(rrdtool) graph \
        $@ \
        --interlaced \
        -v 'megabits/sec' \
        -t 'SMTP Traffic Mb/s' \
        -s $(past_fortnight) \

instead of

        -s $(past_hours) \


I'm guessing this isn't the right way to do this, or I need to include
something else, or modify the RRD creation process to include more accuracy
for aggregate results like this?? If not, what's the correct way so I get
the lovely results for daily, bi-daily, weekly, fortnightly, monthly and
yearly, like I see on some FlowScan+RRDtool traffic pages..

thanks,

--
afort

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