Sébastien CRAMATTE wrote:
Hello,
I’ve read this Article avout VOIP and HFSC
http://automatthias.wordpress.com/2006/06/30/hfsc-and-voip/
I’ve got few questions ?
Considering this
tc class add dev $DEV parent 1:1 classid 1:2 hfsc \
rt m1 ${UPLINK}kbit d 50ms m2 $[1*$UPLINK/10]kbit \
ls m1 ${UPLINK}kbit d 50ms m2 $[3*$UPLINK/10]kbit \
ul rate ${UPLINK}kbit
That command and the script look a bit iffy to me - but then I could be
wrong and often am :-)
rt = realtime curve
ls = linksharing curve
but
m1 = ?
m1 = slope/rate of the first part of the curve.
m2 = ?
m2 = slope/rate of the second part.
d = dmax ?
I think they will be equal if m1>m2, but not if m1<m2. dmax is a time
when used with umax bytes hfsc will calculate the m1 bitrate needed to
send a packet umax bytes long with a delay of dmax. d is the point on
the x axis where m1 ends and m2 starts. If m1<m2 then d is still d but
not the same as dmax.
Look at the curves on p10 of the sigcom pdf - I think xi = d
http://trash.net/~kaber/hfsc/SIGCOM97.pdf
You can use either format with linux, when you do tc -s -d class ls ...
the output will be in m1 d m2 format.
Andy.
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