On Thu, Apr 30, 2015 at 7:38 AM, Jonathan Morton <[email protected]> wrote: > It took me a while to get around to thinking about this, partly because my > phone inexplicably refuses to believe snapon exists.
It has an old dnssec signed dns tree, using the isc dlv, which turned out to somewhat break older versions of dnsmasq, if that helps any. Dire need for some sysadmin help on bufferbloat.net, the cruft has accumulated. > I have two possible explanations for these results. Maybe both apply to some > extent. > > Dropping packets rather than marking them results in an increase in ack > density in the reverse direction, because delayed acks get temporarily > disabled. The strength of this effect depends on the BDP and the depth of > delayed acks. Hmm. > > Increasing the number of simultaneous flows might increase the CPU load of > connection tracking for NAT. Are you shaping and doing NAT on the same box? > I think this might be the basic reason for increased latency. That particular setup (yurtlab) offloads the NAT to the cable modem. The 110_11Mbit shaping was of course, done on the rangeley. It is possible given the older kernel that perhaps I could be hitting the same power mgmt issue that someone else here ran into earlier, or merely the kernel is weird, or something new like xmit_more is messing up life. I returned to another location (gf) and tested 50mbit down/5mbit up (cerowrt 3.10.50-1 in front of a live cablemodem, same two boxes driving the test) up for much of the past 2 days, and on the same test (rrul starting, then doing the dslreports test) observe expected results, with the download having the normal brief spike, the upload impact being nearly immeasurable, and the observed latency increase in either direction, negligible. http://snapon.lab.bufferbloat.net/~d/dslreports2/dslreports_vs_rrul_50_5mbit.png verses the puzzling one: http://snapon.lab.bufferbloat.net/~d/dsl/vsdslreports_at_the_sametime.png So the next step for me is to get cake working in openwrt on hardware fast enough to run at 110Mbit and returning to the yurtlab to try it... but that won't be til sunday at best. Tho I almost got it built, at least, last night. Still sorting through patches.... > > - Jonathan Morton -- Dave Täht Open Networking needs **Open Source Hardware** https://plus.google.com/u/0/+EricRaymond/posts/JqxCe2pFr67 _______________________________________________ Cerowrt-devel mailing list [email protected] https://lists.bufferbloat.net/listinfo/cerowrt-devel
