Hi, Today, I pulled out most recent wireless-testing(2.6.39-rc5-wl) and tried to verify IBSS throughput between two ar5414 cards. (Profile : two boards are net4826 )
I just got up to 20Mbps throughput between those, this looks normal with this environment. this was not so bad. Back to last Feb. I also got reasonable throughput with 2.6.38 on the similar test bed. "basic-rate" parameter value (iw ibss command) can make some impact on the throughput, but 1Mbps sounds too low regarding this parameter impact. ..... But, JFYI, let me report that I faced different problem while doing these tests. The receiver side got frequently(always, I can say) crashed when traffic is pretty high (20Mbps in my case ) Sometimes, Ethernet driver seems got into the crash when it received too many packets. I did not spend much time for the crashing problem so far, but I feel this is irrelevant to the throughput issue. regards Takayuki Kaiso -------------------------------------------------------------------------- root@RMR1:/# iperf -s -u -i 3.0 ------------------------------------------------------------ Server listening on UDP port 5001 Receiving 1470 byte datagrams UDP buffer size: 108 KByte (default) ------------------------------------------------------------ [ 3] local 10.0.1.71 port 5001 connected with 192.168.3.242 port 42610 [ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams [ 3] 0.0- 3.0 sec 7.08 MBytes 19.8 Mbits/sec 0.701 ms 44/ 5096 (0.86%) [ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams [ 3] 3.0- 6.0 sec 7.12 MBytes 19.9 Mbits/sec 0.800 ms 4/ 5084 (0.079%) [ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams [ 3] 6.0- 9.0 sec 7.17 MBytes 20.0 Mbits/sec 0.339 ms 10/ 5122 (0.2%) [ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams [ 3] 9.0-12.0 sec 6.96 MBytes 19.5 Mbits/sec 0.556 ms 73/ 5041 (1.4%) [ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams [ 3] 12.0-15.0 sec 7.13 MBytes 19.9 Mbits/sec 0.830 ms 59/ 5145 (1.1%) [ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams [ 3] 15.0-18.0 sec 7.19 MBytes 20.1 Mbits/sec 0.292 ms 2/ 5128 (0.039%) [ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams [ 3] 18.0-21.0 sec 7.14 MBytes 20.0 Mbits/sec 0.285 ms 10/ 5102 (0.2%) [ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams [ 3] 21.0-24.0 sec 7.07 MBytes 19.8 Mbits/sec 0.834 ms 42/ 5085 (0.83%) [ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams [ 3] 24.0-27.0 sec 7.16 MBytes 20.0 Mbits/sec 0.344 ms 12/ 5120 (0.23%) BUG: unable to handle kernel NULL pointer dereference at 00000002 IP: [<c895fc3b>] ieee80211_rx_handlers+0x6ab/0x1a90 [mac80211] *pde = 00000000 Oops: 0000 [#1] PREEMPT last sysfs file: /sys/devices/pci0000:00/0000:00:0f.0/ieee80211/phy1/index Modules linked in: scx200_wdt xt_NOTRACK iptable_raw xt_state nf_defrag_ipv4 nf_conntrack pppoe pppox ipt_REJECT xt_TCPMSS ipt_LOG xt_multiport xt_mac xt_limit iptable_mangle iptable_filte] Pid: 1303, comm: iperf Not tainted 2.6.39-rc5-wl #1 EIP: 0060:[<c895fc3b>] EFLAGS: 00010282 CPU: 0 EIP is at ieee80211_rx_handlers+0x6ab/0x1a90 [mac80211] EAX: 00000000 EBX: c79a8000 ECX: 00000001 EDX: c7a3a634 ESI: c7809ee4 EDI: c7b9c022 EBP: c7809e54 ESP: c7809dd4 DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 Process iperf (pid: 1303, ti=c7808000 task=c7a21090 task.ti=c7bfa000) Stack: 00000001 00000002 c128f863 00000292 c7809e34 c7809e40 00000000 c79a8000 c7809e0c 00000008 c7a30088 00000088 00025220 00000003 c7809e20 00000691 00000030 c7809e20 c102cdc3 c7ae8200 00000000 ffffffff c7a3a360 c7b78318 Call Trace: [<c128f863>] ? do_IRQ+0x43/0x8d [<c102cdc3>] ? irq_exit+0x43/0x60 [<c1206914>] ? skb_queue_tail+0x54/0x60 [<c8961266>] ieee80211_prepare_and_rx_handle+0x246/0x8a0 [mac80211] [<c1208802>] ? __alloc_skb+0x32/0x120 [<c8961c24>] ieee80211_rx+0x2e4/0x970 [mac80211] [<c1208831>] ? __alloc_skb+0x61/0x120 [<c89e5ce8>] ath5k_tasklet_rx+0x308/0x850 [ath5k] [<c1003f02>] ? handle_irq+0x12/0x80 [<c1003f02>] ? handle_irq+0x12/0x80 > (Forgot to add CC to devel) > > btw. I have very critical link so no testing can be made.. I can try > in late hours but I run nodes on slow machines with USB Stick instead > of HDD so compilation of kernel is sometimes close to 2 hours. > I know I went to .38-rc1 to apply ath9k patches for AP mode... and > there was problem with ath5k.. so I couldn't use both cards in same > machine... I long waited for stable .38 or 39-rc ... but no progress > and I cant find anyone else complaining.. but it's easy to reproduce.. > I have few links with different chipsets so It's ath5k issue for sure. > > Can someone try it? one link.. both ath5k ... I have link with > rt61pci<-->ath5k which seems to work fine on 2.6.38.4 .. but > ath5k-ath5k --- no go... I guess it's something with rate control but > I'm not much of a coder or debugger for that matter. > > Thanks for any help. > > On Sat, Apr 30, 2011 at 4:59 AM, Denis Periša <de...@si-wifi.org > <mailto:de...@si-wifi.org>> wrote: > > No, I tried next stable version... why sould be it stable in first > place? > Have Anyone tried it? > > Thankx > > > On Sat, Apr 30, 2011 at 3:09 AM, Adrian Chadd <adr...@freebsd.org > <mailto:adr...@freebsd.org>> wrote: > > The obvious question - have you bisected the kernel versions > to find > which one introduced this regression? > > > Adrian > > On 30 April 2011 03:13, Denis Periša <de...@si-wifi.org > <mailto:de...@si-wifi.org>> wrote: > > Hello to all, > > > > I have problem since 2.6.38 kernel. > > I use link in ad-hoc mode between two nods. Link is 5ghz > (channel doesn't > > seem to matter.. let's say 120). > > On 2.6.37 kernel I have link speeds up to 25mbit/s.. with > 2.6.38 (and latest > > wireless-testing.git) I have like 1,2mbit/s!!!! > > When I force 54M rate, then it goes up to maximum 7mbit !! > > > > This is disaster... I've been waiting long time for someone > to fix it in > > wireless-testing but nothing so far.. I'm I first to report > this? > > > > Thank you! > > > > _______________________________________________ > > ath5k-devel mailing list > > ath5k-devel@lists.ath5k.org <mailto:ath5k-devel@lists.ath5k.org> > > https://lists.ath5k.org/mailman/listinfo/ath5k-devel > > > > > > > > > _______________________________________________ > ath5k-devel mailing list > ath5k-devel@lists.ath5k.org > https://lists.ath5k.org/mailman/listinfo/ath5k-devel _______________________________________________ ath5k-devel mailing list ath5k-devel@lists.ath5k.org https://lists.ath5k.org/mailman/listinfo/ath5k-devel
