Date: Fri, 14 Mar 2014 17:50:12 -0700 From: Adrian Chadd <adrian.chadd@gmail.com> To: Jim Long <james@museum.rain.com> Cc: "freebsd-wireless@freebsd.org" <freebsd-wireless@freebsd.org> Subject: Re: Poor performance w/Intel 2200BG (iwi) on FreeBSD 9.2 Message-ID: <CAJ-VmomfR5YQqaj8pYB80tLEdEcJjP0a%2B1tXqE6V1-Tpo7MLRQ@mail.gmail.com> In-Reply-To: <CAJ-VmonmH1vDqtL=Pu6sG53Ro-3DyC5QmtKtUJtvZmTDbM0Aug@mail.gmail.com> References: <20140314230013.GA25473@ns.umpquanet.com> <CAJ-VmonmH1vDqtL=Pu6sG53Ro-3DyC5QmtKtUJtvZmTDbM0Aug@mail.gmail.com>
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It'd be stuff like this:
case IWI_NOTIF_TYPE_CALIBRATION:
case IWI_NOTIF_TYPE_NOISE:
case IWI_NOTIF_TYPE_LINK_QUALITY:
DPRINTFN(5, ("Notification (%u)\n", notif->type));
break;
-a
On 14 March 2014 17:18, Adrian Chadd <adrian.chadd@gmail.com> wrote:
> Hi,
>
> I'm not sure what kind of statistics or diagnostics iwi spits out.
> It's likely worth reviewing the linux and freebsd drivers to see if it
> does spit out any kind of statistics messages. That's a good starting
> point.
>
> Thanks!
>
>
> -a
>
>
> On 14 March 2014 16:00, Jim Long <james@museum.rain.com> wrote:
>> I have a long-standing problem that involves the iwi interface on
>> my Thinkpad T42 running 9.2-PRERELEASE circa 28 Aug 2013.
>>
>> Some wifi connections I make show good signal strength, but poor
>> latency and/or packet loss to the WAP IP. I can't find other
>> wifi users who perceive the wifi performance as poor, so I am
>> assuming the problem is local to me.
>>
>> I will say this is generally repeatable by location: good
>> locations are usually good, bad locations are usually bad. My
>> theory is that the 2200BG likes some WAPs that I use more than it
>> likes others. I'd like to find out what I can do to either fix
>> the problem, or at least be able to accurately tell the WAP owner
>> what their problem is.
>>
>> I'm ignorant about how to troubleshoot problems like this, so
>> please suggest some diagnostic information I can provide to guide
>> either of us toward a solution.
>>
>> Thank you,
>>
>> Jim
>>
>> from dmesg:
>>
>> iwi0: <Intel(R) PRO/Wireless 2200BG> mem 0xc0214000-0xc0214fff irq 11 at device 2.0 on pci2
>> wlan0: Ethernet address: 00:12:f0:ca:5c:85
>>
>> I get this a lot, but don't know if it's relevant. It seems
>> to appear during both good and bad connections:
>>
>> iwi0: need multicast update callback
>>
>>
>> Here's 61db of S/N ratio, resulting in almost 50% packet loss:
>>
>> $ wlanstats ; ping -c20 wap2
>> 36 rx frame too short
>> 5 rx from wrong bssid
>> 374 rx discard 'cuz dup
>> 5 rx discard 'cuz mcast echo
>> 3 rx discard mgt frames
>> 1347 rx beacon frames
>> 4151 rx element unknown
>> 42 rx frame chan mismatch
>> 7 rx disassociation
>> 7 beacon miss events handled
>> 6 active scans started
>> 1446 rx management frames
>> 2 tx failed 'cuz vap not in RUN state
>> 28752 total data frames received
>> 8679 unicast data frames received
>> 20073 multicast data frames received
>> 12186 total data frames transmit
>> 12186 unicast data frames sent
>> 54M current transmit rate
>> 61 current rssi
>> -95 current noise floor (dBm)
>> -34 current signal (dBm)
>> PING wap2 (192.168.2.1): 56 data bytes
>> 64 bytes from 192.168.2.1: icmp_seq=0 ttl=64 time=20.726 ms
>> 64 bytes from 192.168.2.1: icmp_seq=1 ttl=64 time=0.974 ms
>> 64 bytes from 192.168.2.1: icmp_seq=2 ttl=64 time=1.278 ms
>> 64 bytes from 192.168.2.1: icmp_seq=3 ttl=64 time=1.942 ms
>> 64 bytes from 192.168.2.1: icmp_seq=4 ttl=64 time=1.008 ms
>> 64 bytes from 192.168.2.1: icmp_seq=8 ttl=64 time=0.921 ms
>> 64 bytes from 192.168.2.1: icmp_seq=10 ttl=64 time=1.755 ms
>> 64 bytes from 192.168.2.1: icmp_seq=11 ttl=64 time=0.934 ms
>> 64 bytes from 192.168.2.1: icmp_seq=13 ttl=64 time=2.803 ms
>> 64 bytes from 192.168.2.1: icmp_seq=16 ttl=64 time=1.698 ms
>> 64 bytes from 192.168.2.1: icmp_seq=18 ttl=64 time=2.382 ms
>>
>> --- wap2 ping statistics ---
>> 20 packets transmitted, 11 packets received, 45.0% packet loss
>> round-trip min/avg/max/stddev = 0.921/3.311/20.726/5.540 ms
>>
>> To my knowledge the OS is using the latest 3.1 firmware for the
>> interface:
>>
>> $ cd /usr/src/sys/contrib/dev/iwi
>> $ grep ^FW Makefile; md5 *
>> FW_VERSION=3.1
>> MD5 (LICENSE) = 11963afae1fb1117b86fde8187152b9a
>> MD5 (Makefile) = 2e4c774520e878e5cf8f3be7373fec02
>> MD5 (ipw2200-bss.fw.uu) = 7c15a60e1ccf28c332d3d795af99012b
>> MD5 (ipw2200-ibss.fw.uu) = b529089d6eee6c12a918f361ee2c8347
>> MD5 (ipw2200-sniffer.fw.uu) = 9e6c7a76cb528cb1d9f1996189d9c699
>>
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