[Bug 718736] New: Wi-fi speed drops down after some heavy usage

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bugzilla_noreply＠novell.com

18 Sep 2011 18 Sep '11

05:59

https://bugzilla.novell.com/show_bug.cgi?id=718736 https://bugzilla.novell.com/show_bug.cgi?id=718736#c0 Summary: Wi-fi speed drops down after some heavy usage Classification: openSUSE Product: openSUSE 11.4 Version: Final Platform: x86 OS/Version: openSUSE 11.4 Status: NEW Severity: Major Priority: P5 - None Component: Kernel AssignedTo: kernel-maintainers@forge.provo.novell.com ReportedBy: aectann@gmail.com QAContact: qa@suse.de Found By: --- Blocker: --- User-Agent: Mozilla/5.0 (X11; Linux i686; rv:6.0.2) Gecko/20100101 Firefox/6.0.2 I have a lenovo x220 laptop here with Realtek wi-fi module. # lspci -nn | grep Real 03:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8188CE 802.11b/g/n WiFi Adapter [10ec:8176] (rev 01) I've noticed that it's speed drops down to approximately 1Mbit/s under heavy load. For exmaple if I start to download a torrent file or jsut do speedtest.net testing, firstly it transkmits data on my ISP maximum speed (about 20MBit/s), then, after few seconds, transmission rate goes down. It's not an ISP issue, cause on ethernet everything is o.k. Reproducible: Always Steps to Reproduce: 1. Start downloading a big file 2. Notice, how download speed decreases over time Actual Results: Speed is drastically slow Expected Results: Speed should not go down. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.

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bugzilla_noreply＠novell.com

18 Sep 18 Sep

06:00

New subject: [Bug 718736] Wi-fi speed drops down after some heavy usage

bugzilla_noreply＠novell.com

14:21

New subject: [Bug 718736] Wi-fi speed drops down after some heavy usage

https://bugzilla.novell.com/show_bug.cgi?id=718736 https://bugzilla.novell.com/show_bug.cgi?id=718736#c1 Larry Finger changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |Larry.Finger@lwfinger.net --- Comment #1 from Larry Finger 2011-09-18 14:21:19 UTC --- Please try the following: sudo /sbin/modprobe -rv rtl8192ce sudo /sbin/modprobe -v rtl8192ce ips=0 That will disable power save. Does it help? -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.

bugzilla_noreply＠novell.com

14:27

New subject: [Bug 718736] Wi-fi speed drops down after some heavy usage

https://bugzilla.novell.com/show_bug.cgi?id=718736 https://bugzilla.novell.com/show_bug.cgi?id=718736#c2 --- Comment #2 from Konstantin Burov 2011-09-18 14:27:56 UTC --- (In reply to comment #1)

...

Please try the following:

sudo /sbin/modprobe -rv rtl8192ce sudo /sbin/modprobe -v rtl8192ce ips=0

That will disable power save. Does it help?

I've just tried it, no luck. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.

bugzilla_noreply＠novell.com

15:29

New subject: [Bug 718736] Wi-fi speed drops down after some heavy usage

https://bugzilla.novell.com/show_bug.cgi?id=718736 https://bugzilla.novell.com/show_bug.cgi?id=718736#c3 --- Comment #3 from Larry Finger 2011-09-18 15:29:08 UTC --- Running the standard 12.1 MS5 kernel (3.0.0-4-desktop) and connecting to speedtest.net, I get the following: Down Up 16.1 0.95 21.6 0.95 11.6 0.95 12.8 0.95 All numbers are in Mbps. As my ISP only guarantees 10 down and 1 up, I am getting full speed. This is on an 802.11n wireless connection to a Netgear WND3300 AP. When I use nerperf to connect to a server that is wired to the router, I get: TCP_MAERTS Test: 69.21 70.37 62.46 72.46 65.84 73.38 35.93 63.67 72.86 73.23 Results: max 73.38, min 35.93. Mean 65.94(10.71) TCP_STREAM Test: 87.31 86.94 87.95 88.68 88.97 88.59 88.16 89.34 72.27 89.29 Results: max 89.34, min 72.27. Mean 86.75(4.89) TCP_SENDFILE Test: 89.14 88.66 88.56 89.33 89.13 88.73 87.60 86.56 88.59 88.70 Results: max 89.33, min 86.56. Mean 88.50(0.79) A second run got TCP_MAERTS Test: 43.74 71.54 71.36 74.48 74.29 73.80 73.90 70.40 73.76 73.81 Results: max 74.48, min 43.74. Mean 70.11(8.89) TCP_STREAM Test: 88.51 89.75 72.16 89.55 89.54 88.58 88.97 89.47 88.92 88.09 Results: max 89.75, min 72.16. Mean 87.35(5.09) TCP_SENDFILE Test: 89.87 89.35 89.45 89.12 71.85 89.15 89.05 89.08 89.41 89.31 Results: max 89.87, min 71.85. Mean 87.56(5.24) MAERTS is receiving - the others are transmitting. Each of the individual measurements is a 10 second sample. What is your AP? What kind of connection? Is there any possibility of your setting up a local test like mine? Is there another computer on your network? -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.

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23:36

New subject: [Bug 718736] Wi-fi speed drops down after some heavy usage

https://bugzilla.novell.com/show_bug.cgi?id=718736 https://bugzilla.novell.com/show_bug.cgi?id=718736#c4 --- Comment #4 from Konstantin Burov 2011-09-18 23:36:04 UTC --- (In reply to comment #3)

...

What is your AP? What kind of connection?

Is there any possibility of your setting up a local test like mine? Is there another computer on your network?

My AP is Asus WL520gc and connection is 802.11g (54MBit/sec) with WPA-Personal Authentication (I've tried WEP auth instead, no changes so far). I'm pretty sure that it's not an AP problem, for there are other devices connected to the AP and they do not have any problems. I have two more laptops (Lenovo u330 and Asus EEE PC Seashell, both runnnin OpenSuse 11.4) connected and a couple of android-based smartphones, all show stable maxed results on speedtest.net. I'll do the netperf test later today and post results here. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.

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19 Sep 19 Sep

13:06

New subject: [Bug 718736] Wi-fi speed drops down after some heavy usage

https://bugzilla.novell.com/show_bug.cgi?id=718736 https://bugzilla.novell.com/show_bug.cgi?id=718736#c5 --- Comment #5 from Konstantin Burov 2011-09-19 13:06:54 UTC --- Here is what I get running netperf. The server is running on another laptop connected to the same AP. linux:/home/linux # netperf -H 192.168.0.5 -t TCP_SENDFILE -f M -D 1.0 TCP SENDFILE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.0.5 (192.168.0.5) port 0 AF_INET : demo Interim result: 0.46 MBytes/s over 1.09 seconds Interim result: 0.42 MBytes/s over 1.00 seconds Interim result: 0.32 MBytes/s over 1.50 seconds Interim result: 0.52 MBytes/s over 1.02 seconds Interim result: 0.45 MBytes/s over 1.14 seconds Interim result: 0.50 MBytes/s over 1.19 seconds Interim result: 0.46 MBytes/s over 1.09 seconds Interim result: 0.45 MBytes/s over 1.11 seconds Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. MBytes/sec 87380 16384 16384 10.33 0.44 linux:/home/linux # netperf -H 192.168.0.5 -t TCP_STREAM -f M -D 1.0 MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.0.5 (192.168.0.5) port 0 AF_INET : demo Interim result: 0.49 MBytes/s over 1.68 seconds ending at 1316469853.493 Interim result: 0.55 MBytes/s over 1.03 seconds ending at 1316469854.523 Interim result: 0.50 MBytes/s over 1.09 seconds ending at 1316469855.613 Interim result: 0.44 MBytes/s over 1.14 seconds ending at 1316469856.751 Interim result: 0.61 MBytes/s over 1.05 seconds ending at 1316469857.799 Interim result: 0.54 MBytes/s over 1.13 seconds ending at 1316469858.926 Interim result: 0.51 MBytes/s over 1.08 seconds ending at 1316469860.007 Interim result: 0.54 MBytes/s over 1.18 seconds ending at 1316469861.187 Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. MBytes/sec 87380 16384 16384 11.32 0.47 linux:/home/linux # netperf -H 192.168.0.5 -t TCP_MAERTS -f M -D 1.0 MIGRATED TCP MAERTS TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.0.5 (192.168.0.5) port 0 AF_INET : demo Interim result: 0.12 MBytes/s over 1.00 seconds ending at 1316469867.041 Interim result: 0.11 MBytes/s over 1.05 seconds ending at 1316469868.089 Interim result: 0.15 MBytes/s over 1.06 seconds ending at 1316469869.145 Interim result: 0.11 MBytes/s over 1.29 seconds ending at 1316469870.437 Interim result: 0.11 MBytes/s over 1.01 seconds ending at 1316469871.443 Interim result: 0.14 MBytes/s over 1.00 seconds ending at 1316469872.444 Interim result: 0.11 MBytes/s over 1.23 seconds ending at 1316469873.674 Interim result: 0.13 MBytes/s over 1.24 seconds ending at 1316469874.910 Interim result: 0.13 MBytes/s over 1.03 seconds ending at 1316469875.940 Interim result: 0.11 MBytes/s over 1.19 seconds ending at 1316469877.125 Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. MBytes/sec 87380 16384 16384 11.64 0.12 -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.

bugzilla_noreply＠novell.com

13:28

New subject: [Bug 718736] Wi-fi speed drops down after some heavy usage

https://bugzilla.novell.com/show_bug.cgi?id=718736 https://bugzilla.novell.com/show_bug.cgi?id=718736#c6 --- Comment #6 from Konstantin Burov 2011-09-19 13:28:23 UTC --- Here is same test but with server connected to the AP by ethernet: 1-st run: linux:/home/linux # netperf -H 192.168.0.100 -t TCP_STREAM -D 1.0 -l 100 MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.0.100 (192.168.0.100) port 0 AF_INET : demo Interim result: 26.59 10^6bits/s over 1.01 seconds ending at 1316470928.572 Interim result: 25.40 10^6bits/s over 1.05 seconds ending at 1316470929.620 Interim result: 26.18 10^6bits/s over 1.04 seconds ending at 1316470930.656 Interim result: 27.66 10^6bits/s over 1.06 seconds ending at 1316470931.713 Interim result: 28.67 10^6bits/s over 1.04 seconds ending at 1316470932.755 Interim result: 27.48 10^6bits/s over 1.05 seconds ending at 1316470933.809 Interim result: 28.99 10^6bits/s over 1.03 seconds ending at 1316470934.840 2-nd run: linux:/home/linux # netperf -H 192.168.0.100 -t TCP_STREAM -D 1.0 -l 10 MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.0.100 (192.168.0.100) port 0 AF_INET : demo Interim result: 4.68 10^6bits/s over 1.93 seconds ending at 1316471190.155 Interim result: 4.54 10^6bits/s over 1.04 seconds ending at 1316471191.195 Interim result: 4.92 10^6bits/s over 1.04 seconds ending at 1316471192.235 Interim result: 3.53 10^6bits/s over 1.37 seconds ending at 1316471193.608 Interim result: 3.41 10^6bits/s over 1.04 seconds ending at 1316471194.645 Interim result: 4.85 10^6bits/s over 1.11 seconds ending at 1316471195.753 Notice how on second run speed dropped down. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.

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13:28

New subject: [Bug 718736] Wi-fi speed drops down after some heavy usage

https://bugzilla.novell.com/show_bug.cgi?id=718736 https://bugzilla.novell.com/show_bug.cgi?id=718736#c7 --- Comment #7 from Konstantin Burov 2011-09-19 13:28:55 UTC --- Is there anything else I can do to help diagnose the problem? -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.

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13:32

New subject: [Bug 718736] Wi-fi speed drops down after some heavy usage

https://bugzilla.novell.com/show_bug.cgi?id=718736 https://bugzilla.novell.com/show_bug.cgi?id=718736#c8 --- Comment #8 from Konstantin Burov 2011-09-19 13:32:29 UTC --- Dunno if that's needed, but still.. I run a live USB stick with 12.1 Milestone 5.

...

Linux 3.0.0-4-default i686 openSUSE 12.1 Milestone 5 (i586)

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20 Sep 20 Sep