Re: strange fedora problem
Have you tried specifying that it should operate on full-duplex. The
switches at my school had auto-detect turned off and I had to do that
before I got it working at expected speeds of 95+ mbps.
On 1/22/06, Aram Mirzadeh <awm --at-- mbcli.com> wrote:
>
> Hello all,
>
> Strange problem with a linux installation. Data coming from the system
> comes out in very erratic bursts. I know its the software configuration
> because if I boot up Knoppix LiveCD the problem goes away, however I am
> unable to duplicate the success of Knoppix AND its speed. Wondering if
> someone here can help me. I haven't named the distro because I have had
> redhat 9, fedora 1,2 & 3 on this machine. Right now its Fedora 3.
>
> I am at 100MB/Full (autoneg off) -- verified with ethtool.
>
> C:\iperf>iperf -c 192.168.1.4 -r
> ------------------------------------------------------------
> Server listening on TCP port 5001
> TCP window size: 8.00 KByte (default)
> ------------------------------------------------------------
> ------------------------------------------------------------
> Client connecting to 192.168.1.4, TCP port 5001
> TCP window size: 8.00 KByte (default)
> ------------------------------------------------------------
> [1932] local 192.168.1.80 port 1872 connected with 192.168.1.4 port 5001
> [ ID] Interval Transfer Bandwidth
> [1932] 0.0-10.0 sec 85.1 MBytes 71.3 Mbits/sec
> [1912] local 192.168.1.80 port 5001 connected with 192.168.1.4 port 47871
> [ ID] Interval Transfer Bandwidth
> [1912] 0.0-10.0 sec 8.95 MBytes 7.49 Mbits/sec
>
> On the linux side:
>
> #./iperf -s -i 1
> ------------------------------------------------------------
> Server listening on TCP port 5001
> TCP window size: 85.3 KByte (default)
> ------------------------------------------------------------
> [ 4] local 192.168.1.4 port 5001 connected with 192.168.1.80 port 1872
> [ ID] Interval Transfer Bandwidth
> [ 4] 0.0- 1.0 sec 8.20 MBytes 68.8 Mbits/sec
> [ 4] 1.0- 2.0 sec 8.53 MBytes 71.6 Mbits/sec
> [ 4] 2.0- 3.0 sec 8.55 MBytes 71.7 Mbits/sec
> [ 4] 3.0- 4.0 sec 8.56 MBytes 71.8 Mbits/sec
> [ 4] 4.0- 5.0 sec 8.55 MBytes 71.7 Mbits/sec
> [ 4] 5.0- 6.0 sec 8.51 MBytes 71.4 Mbits/sec
> [ 4] 6.0- 7.0 sec 8.57 MBytes 71.9 Mbits/sec
> [ 4] 7.0- 8.0 sec 8.56 MBytes 71.8 Mbits/sec
> [ 4] 8.0- 9.0 sec 8.55 MBytes 71.7 Mbits/sec
> [ 4] 9.0-10.0 sec 8.54 MBytes 71.6 Mbits/sec
> [ 4] 0.0-10.0 sec 85.1 MBytes 71.4 Mbits/sec
> ------------------------------------------------------------
> Client connecting to 192.168.1.80, TCP port 5001
> TCP window size: 16.0 KByte (default)
> ------------------------------------------------------------
> [ 4] local 192.168.1.4 port 47871 connected with 192.168.1.80 port 5001
> [ ID] Interval Transfer Bandwidth
> [ 4] 0.0- 1.0 sec 760 KBytes 6.23 Mbits/sec
> [ 4] 1.0- 2.0 sec 1.04 MBytes 8.72 Mbits/sec
> [ 4] 2.0- 3.0 sec 120 KBytes 983 Kbits/sec
> [ 4] 3.0- 4.0 sec 1.59 MBytes 13.4 Mbits/sec
> [ 4] 4.0- 5.0 sec 408 KBytes 3.34 Mbits/sec
> [ 4] 5.0- 6.0 sec 1.64 MBytes 13.8 Mbits/sec
> [ 4] 6.0- 7.0 sec 816 KBytes 6.68 Mbits/sec
> [ 4] 7.0- 8.0 sec 696 KBytes 5.70 Mbits/sec
> [ 4] 8.0- 9.0 sec 504 KBytes 4.13 Mbits/sec
> [ 4] 9.0-10.0 sec 1.45 MBytes 12.1 Mbits/sec
> [ 4] 0.0-10.0 sec 8.95 MBytes 7.49 Mbits/sec
>
> Now this is actually about 700% than before. Applying a dump of the
> sysctl output from Knoppix to this system improved its performance. So
> its has improved from 1Mbits/sec to the 7.49Mbits you see here. In
> Knoppix the send/receive bandwidth is running around 95.1Mbits/sec.
>
> The only odd thing I see if that ifconfig thinks the ethernet (builtin
> broadcom [tg3 driver]) is on IRQ: 169 ... In Knoppix it does report
> correctly as 16. The version of the driver (tg3) matches between
> Knoppix and this system.
>
> The hardware is:
>
> Dell Intel P4 3Ghz
> Broadcom NIC (integerated)
> CAT 5 cable (tried a diff one too)
> Cisco 2924 Switch (tried a Linksys one too)
> The other servers include a Sun Machine, Free BSD, 3 Windows Servers,
> etc. All exibiting the same issues at different rates. They can all
> pass data between themselves around 97 Mbits/sec.
>
> Aram
>
>
>
>