On Sep 28, 2014, at 11:45 , Sebastian Moeller <[email protected]> wrote:
[…]
>
>
> Now, I have performed a few netperf-wrapper tests recently and it seems there
> is something in my system that screws up latency under load roughly every
> minute (see attached image). Until recemty I believed these to be caused by
> my MacBooks wireless access, but the attached image is from a test win se00
> (also no soft-irq spikes visible on top running on cerowrt). I begin to
> wonder whether these might be caused by ohcpd’s repeated search for a useable
> IPv6 link, but I digress.
>
>
>
This is not going to be too interesting, but for some closure I want to
document the information about this issue (especially since cerowrt is
completely innocent, and I want to avoid spoiling its reputation with another
device’s issues)
So I figured that one out; it was the 2.4GHz wifi on my ISP’s
modem-router (speed port w723v type A, avoid if possible); which was a) running
without associated stations as an emergency fallback in case I screwed up
cerowrt, and b) was actually wedging itself hard after 1 to 48 hours of
operation in that it did not allow any station to connect. And in the wedged
state it completely wiped out this modem-router’s wan throughput. Since this
router was shared between my wired and wireless tests (after all this is the
device talking DSL ;) ) it affected all my tests. Since I disabled that devices
WLAN completely, the latency spikes are gone (actually now I have periodic
spikes, but these are of much smaller magnitude and much less urgent to
solve).\\\
Best Regards
Sebastian
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