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* limited network bandwidth with 3.2.x kernels
@ 2012-02-13 20:04 alekcejk
  2012-02-13 20:18 ` Eric Dumazet
       [not found] ` <1920135.kl3o7Tt79c@localhost.localdomain>
  0 siblings, 2 replies; 66+ messages in thread
From: alekcejk @ 2012-02-13 20:04 UTC (permalink / raw)
  To: netdev

Hi,

I noticed that with 3.2.x kernels download speed from some internet resources
became about half of speed that was with previous kernels (3.1 and older).
I tested Fedora 15 kernels 2.6.41.10 = 3.1.10 and 2.6.42.3 = 3.2.3
(many times rebooted for testing with first and second kernels).
See bug https://bugzilla.redhat.com/show_bug.cgi?id=789659

lsmod:
Module                  Size  Used by
nvidia              10778232  40
i2c_core               28123  1 nvidia
8139too                32490  0
mii                    13311  1 8139too

dmesg:
8139too: 8139too Fast Ethernet driver 0.9.28
8139too 0000:01:02.0: PCI INT A -> GSI 22 (level, low) -> IRQ 22
8139too 0000:01:02.0: eth0: RealTek RTL8139 at , IRQ 22
8139too 0000:01:02.0: eth0: link up, 100Mbps, full-duplex, lpa 0x41E1

For testing I selected fastest for me download mirrors of FreeBSD and Ubuntu,
also I tested download speed from site speedtest.tele2.net.

For these sites download speed with 3.1 kernels (and older) is about 11 MB/s
but with 3.2.x kernels - limited 5.5 MB/s and for some sites still approximately
the same as with 3.1 kernels (see bug mentioned above).

Also I want to pay attention that limited speed stays constant - always
5.5 MB/s with straight line on traffic plotter as if was network bandwidth shaping.
With 3.1 kernels this never happens - speed can vary in some ranges
but at maximum it is about 11 MB/s, no limitations such as 5.5 MB/s.

-- 
Alexey Kurov <nucleo@fedoraproject.org>

^ permalink raw reply	[flat|nested] 66+ messages in thread

end of thread, other threads:[~2012-02-27 19:39 UTC | newest]

Thread overview: 66+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2012-02-13 20:04 limited network bandwidth with 3.2.x kernels alekcejk
2012-02-13 20:18 ` Eric Dumazet
2012-02-13 21:13   ` Eric Dumazet
2012-02-13 21:58     ` alekcejk
2012-02-13 22:44       ` Eric Dumazet
2012-02-13 22:51         ` Neal Cardwell
2012-02-13 23:09           ` alekcejk
2012-02-13 23:14             ` Eric Dumazet
2012-02-13 23:24               ` alekcejk
2012-02-13 23:49         ` alekcejk
2012-02-14  3:06           ` Neal Cardwell
2012-02-14  3:26             ` alekcejk
2012-02-14  5:55           ` Eric Dumazet
2012-02-14 14:09             ` alekcejk
2012-02-13 21:16   ` alekcejk
2012-02-21  4:21   ` alekcejk
2012-02-21 16:45     ` Eric Dumazet
2012-02-21 17:19       ` alekcejk
2012-02-21 17:31         ` Eric Dumazet
2012-02-21 18:53           ` alekcejk
2012-02-22  1:26           ` alekcejk
     [not found] ` <1920135.kl3o7Tt79c@localhost.localdomain>
     [not found]   ` <1329228798.4818.0.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC>
2012-02-14 14:28     ` alekcejk
2012-02-14 16:00       ` Eric Dumazet
2012-02-14 16:43         ` alekcejk
2012-02-15  4:43           ` Eric Dumazet
2012-02-15  6:03             ` Neal Cardwell
2012-02-15  6:06               ` Eric Dumazet
2012-02-15  7:52                 ` Bill Fink
2012-02-15  8:00                   ` Eric Dumazet
2012-02-15  8:18                     ` Bill Fink
2012-02-15  8:31                       ` Eric Dumazet
2012-02-15 13:44                   ` alekcejk
2012-02-15 13:43               ` Re: Re: Re: Re: " alekcejk
2012-02-15 13:44             ` alekcejk
2012-02-15 13:49               ` Eric Dumazet
2012-02-15 13:53                 ` Eric Dumazet
2012-02-15 14:11                 ` alekcejk
2012-02-15 14:49                   ` Neal Cardwell
2012-02-15 14:56                     ` Eric Dumazet
2012-02-15 15:05                     ` alekcejk
2012-02-15 15:08                   ` Eric Dumazet
2012-02-15 19:44                     ` Neal Cardwell
2012-02-16  7:29                       ` Eric Dumazet
2012-02-16 13:40                         ` Eric Dumazet
2012-02-16 13:51                           ` Ben Hutchings
2012-02-16 15:09                             ` Eric Dumazet
2012-02-16 16:37                               ` Ben Hutchings
2012-02-16 17:01                               ` David Miller
2012-02-16 17:22                                 ` Neal Cardwell
2012-02-16 17:54                                   ` alekcejk
2012-02-16 18:19                                     ` Neal Cardwell
2012-02-16 21:49                                       ` alekcejk
2012-02-16 21:59                                         ` Eric Dumazet
2012-02-16 22:08                                           ` alekcejk
2012-02-16 22:35                                             ` Eric Dumazet
2012-02-17 16:41                                               ` Neal Cardwell
2012-02-21 18:41                                                 ` Eric Dumazet
2012-02-21 19:11                                                   ` David Miller
2012-02-22  5:51                                                   ` Neal Cardwell
2012-02-22  7:36                                                     ` Eric Dumazet
2012-02-23 18:39                                                       ` Neal Cardwell
2012-02-23 18:49                                                         ` Eric Dumazet
2012-02-27 19:39                                                         ` David Miller
2012-02-17 16:55                                           ` Re: " Neal Cardwell
2012-02-16 18:22                                   ` Eric Dumazet
2012-02-16 19:44                                     ` Eric Dumazet

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