<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><br>On Sep 28, 2014, at 11:45 , Sebastian Moeller <<a href="mailto:moeller0@gmx.de">moeller0@gmx.de</a>> wrote:<br>[…]<br><blockquote type="cite"><br><br>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.<br><br><img height="207" width="320" apple-width="yes" apple-height="yes" apple-inline="yes" id="20759BC4-9EC2-40C9-933D-D33F4A88B8E6" src="cid:8E5FFA22-59F1-4882-828F-FC6EE0A8237A@home.lan"><br><br></blockquote><div><br></div><span class="Apple-tab-span" style="white-space:pre"> </span>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)<br><div><span class="Apple-tab-span" style="white-space:pre"> </span>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).\\\</div><div><br></div><div>Best Regards</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>Sebastian</div><div><span class="Apple-tab-span" style="white-space:pre"> </span></div></body></html>