Development issues regarding the cerowrt test router project
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* [Cerowrt-devel] rounding errors in sch_pie currently
@ 2013-06-16 21:26 Dave Taht
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From: Dave Taht @ 2013-06-16 21:26 UTC (permalink / raw)
  To: cerowrt-devel

In my modified pie a rounding error is introduced with the HZ values
cerowrt uses (I think it's 250, but would have to check)

target=20 becomes target=23
target=10 becomes target=11

I still haven't got around to checking the code against the paper,
which I'll start doing this week.

root@CMTS: tc qdisc add dev se00 root pie
root@CMTS: tc qdisc show dev se00
qdisc pie 8001: root refcnt 2 limit 1000p target 23 tupdate 31 alpha 2
beta 20 bytemode  1 ecn
root@CMTS:~# tc qdisc del dev se00 root
root@CMTS:~# tc qdisc add dev se00 root pie target 10
root@CMTS:~# tc qdisc show dev se00
qdisc pie 8002: root refcnt 2 limit 1000p target 11 tupdate 31 alpha 2
beta 20 bytemode  1 ecn

-- 
Dave Täht

Fixing bufferbloat with cerowrt: http://www.teklibre.com/cerowrt/subscribe.html

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2013-06-16 21:26 [Cerowrt-devel] rounding errors in sch_pie currently Dave Taht

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