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[Q] Metric value unit #83
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On Wed, Sep 04, 2019 at 08:21:05AM -0700, yanosz wrote:
Hei folks,
having fun with o11s (great project, btw.) I stumpled up on mpath dump - e.g.
```bash
DEST ADDR NEXT HOP IFACE SN METRIC QLEN EXPTIME DTIM DRET FLAGS
a0:f3:c1:74:91:be a0:f3:c1:74:91:be wlan1 4 257 0 3290 100 0 0x15
```
Metric is supposed explained at "airtime". However, I wasn't able to find further information.
What does 257 represent? Is it ett or wcett? Is it ms, time-units, etc.?
Not sure how to expand those, but I can answer that it is:
1 + 8192 / expected_throughput_mbps
So, if I did the math right, 257 corresponds to 32 Mbps.
Expected throughput is somewhat driver dependent -- some include
retransmissions, some do not and expect rate control to do so, so it is
difficult to compare it across different kinds of hardware or across
kernel versions.
…--
Bob Copeland %% https://bobcopeland.com/
|
Can get the details from airtime_link_metric_get at
net/mac80211/mesh_hwmp.c.
Or referring to IEEE P802.11-REVmc/D6.0, June 2016 section 14.9 cited as
follow:
Airtime reflects the amount of channel resources consumed by transmitting
the frame over a particular link. This measure is approximate and designed
for ease of implementation and interoperability.
…---
Chun-Yeow
On Thu, Sep 5, 2019 at 12:06 AM Bob Copeland <notifications@github.com>
wrote:
On Wed, Sep 04, 2019 at 08:21:05AM -0700, yanosz wrote:
> Hei folks,
>
> having fun with o11s (great project, btw.) I stumpled up on mpath dump -
e.g.
> ```bash
> DEST ADDR NEXT HOP IFACE SN METRIC QLEN EXPTIME DTIM DRET FLAGS
> a0:f3:c1:74:91:be a0:f3:c1:74:91:be wlan1 4 257 0 3290 100 0 0x15
>
> ```
> Metric is supposed explained at "airtime". However, I wasn't able to
find further information.
> What does 257 represent? Is it ett or wcett? Is it ms, time-units, etc.?
Not sure how to expand those, but I can answer that it is:
1 + 8192 / expected_throughput_mbps
So, if I did the math right, 257 corresponds to 32 Mbps.
Expected throughput is somewhat driver dependent -- some include
retransmissions, some do not and expect rate control to do so, so it is
difficult to compare it across different kinds of hardware or across
kernel versions.
--
Bob Copeland %% https://bobcopeland.com/
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Thanks for your response - that's fast :). I tried to update the wiki accordingly. I hope its fine, now |
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Hei folks,
having fun with o11s (great project, btw.) I stumpled up on mpath dump - e.g.
Metric is supposed explained at "airtime". However, I wasn't able to find further information.
What does 257 represent? Is it ett or wcett? Is it ms, time-units, etc.?
I checked https://github.com/o11s/open80211s/wiki/mpath but it didn't contain any details.
The howto (https://github.com/o11s/open80211s/wiki/HOWTO) suggests to reach out to http://lists.open80211s.org/cgi-bin/mailman/listinfo/devel - but that site appears to be down.
What is metric showing exactly? Is this tracker the way to ask such a question?
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