Likewise, I'm a bit curious about the 170Mbit/s throughput reported by iperf. A reported 300Mbit/s link speed is TX+RX aggregate, i.e. 150Mbit/s each for the TX and RX chains combined, and the actual throughput would be diminished both by imperfect wireless signal and protocol overhead(s). If I'm understanding things correctly ...
80Mbit/s sustained throughput is actually much closer to what I'd expect almost any firmware to achieve on a 5.8GHz MIMO point-to-point link. Can you reproduce the 170Mbit/s with tools besides iperf? For example, if the radios are connected to a GigE wired LAN on each end, can you push 100Mbit/s+ in HTTP traffic over the link? On Sat, Dec 22, 2012 at 12:17 PM, Felix Fietkau <n...@openwrt.org> wrote: > On 2012-12-22 4:34 AM, Nicolás Echániz wrote: > > Here at QuintanaLibre we have been testing these new routers and we'd > > like to share some results, in case someone has any tips on how to > > improve performance. > > > > There's a blog post (spanish) on the tests here: > > > http://blog.altermundi.net/article/performance-de-equipos-multi-banda-tl-wdr3600/ > > > > The important bit is that with the original firmware we get a throughput > > of 170 Mbits/sec, while with OpenWRT we get roughly 80 Mbits/sec. > > > > Links report: 300.0 MBit/s MCS 15 40Mhz short GI, but actual transfer > > rate seems low, at almost 100Mbits/s less than the results with the > > original firmware. > > > > > > One detail is that HT capabilities seem to be making no difference. > > > > These two different wireless settings (uci output) produce the exact > > same results: > > > > wireless.radio1.ht_capab = SHORT-GI-20 GI-40 TX-RX STBC-STBC1 DSSS_CCK-40 > > > > wireless.radio1.ht_capab = SHORT-GI-40 > > > > Changing modes from adhoc to ap/sta made no noticeable difference either. > A few questions to figure out the cause of the performance delta: > - How do you measure the throughput? > - Are you using bridging between cable and wifi? > - What is the system load in top while you're running the test? > - Please show me the relevant output from > /sys/kernel/debug/ieee80211/phy1/netdev:*/stations/*/rc_stats while > running a throughput test. > > - Felix > _______________________________________________ > openwrt-devel mailing list > openwrt-devel@lists.openwrt.org > https://lists.openwrt.org/mailman/listinfo/openwrt-devel > -- Ben West http://gowasabi.net b...@gowasabi.net 314-246-9434
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