Ubuntu
linux package

  1. Bug #836250
  2. Comment #97

Comment 97 for bug 836250

Revision history for this message
Dave Russell (drussell) wrote : Re: [Oneiric] [Regression] Intel Corporation Centrino Ultimate-N 6300 poor networking, packet loss and very slow Lenovo X201 and T500 laptops

Equipment: Laptop Lenovo X201 with Intel Corporation Centrino Ultimate-N 6300 (rev 0x74)
           Wireless Router Belkin
           Environment Router in room below, many devices connected.

Ubuntu Kernel AP Mode Measured Speed (iperf) Link Quality Bit Rate Works

Oneiric 3.0.0-12-generic #20-ubuntu ABGN mixed 158 Kbits/sec 64/70 240 Mbits/sec No
Oneiric 2.6.39-020639 ABGN mixed 101 Kbits/sec 63/70 135 Mbits/sec No
Oneiric 3.0.0-0300-generic #201107220917 ABGN mixed 17.5 Kbits/sec 67/70 120 Mbits/sec No
Oneiric 3.0.0-0300-generic #201107220917 G Only 11.2 Mbits/sec 60/70 54 Mbits/sec Yes
Natty 2.6.38-13-generic #52-Ubuntu ABGN mixed 11.7 Mbits/sec 66/70 54 Mbits/sec Yes
Natty 2.6.38-020638-generic ABGN mixed 12.3 Mbits/sec 68/70 54 Mbits/sec Yes
Natty 2.6.39-020639rc4-generic ABGN mixed 13.5 Mbits/sec 66/70 54 Mbits/sec Yes

So I've run nearly identical kernels on both natty and oneiric, 2.6.39-020639 only difference being the natty one was RC4
So unless something changed between those kernels, natty is limited to G speeds regardless and suffers no performance degredation
Where as oneiric isn't limited and even with what should be a *good* kernel, is hopeless
Unless there were significant changes between the Natty 2.6.39-020639 RC4 kernel and the Oneiric 2.6.39-020639 kernel