Extreme latency with moderate link utilization
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#11 Extreme latency with moderate link utilization
When downloading any large file over a sustained period at any rate greater than ~40KB/sec, latency on the link (tested to the access point) skyrockets - shooting from 1-2 ms up to 300-1000ms, with short spikes up to 4000ms. the machine is not cpu bound during this period. as soon as the large transfer completes, latency drops back to normal. other machines on the same wireless network do not experience high latency at the same time. peak throughput *is* affected - other machines on the wireless network have no problem transferring at up to 900KB/sec, but this machine never goes much higher than 100KB/sec (perhaps unsurprisingly).
Bus 001 Device 004: ID 0bda:8187 Realtek Semiconductor Corp. RTL8187 Wireless Adapter
Linux asrock 2.6.28-15-generic #48-Ubuntu SMP Wed Jul 29 08:54:56 UTC 2009 i686 GNU/Linux
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I have the same problem. I tried changing encription to WEP, WPA, WPA2 and turning encryption off. Always the same problem. I can't get more than 120KB/s. On windows and OS X problem don't exist (transfer about 1.2MB/s, no incrased latency).
Bus 001 Device 003: ID 0bda:8189 Realtek Semiconductor Corp. RTL8187B Wireless 802.11g 54Mbps Network Adapter
Linux THC 2.6.31-ARCH #1 SMP PREEMPT Fri Oct 23 10:03:24 CEST 2009 x86_64 Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz GenuineIntel GNU/Linux