Performance problems - bandwidth restricted

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Performance problems - bandwidth restricted

by Ed Noepel :: Rate this Message:

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When using endian FW, my downstream performance was limited to ~300kb/sec, upstream ~15kb/sec.  Netstat showed no suspicious connections, and the bandwidth chart did not show suspicious activity.  I turned off all services spare DHCP, which had no effect on the problem.  Naturally, I thought I was dealing with a cap.  I found this not to be the case by plugging a (non-windows) client machine directly into my cable modem; I then got the expected 8mb/sec downstream, 900k/sec upstream.

Next I checked networking hardware, thinking my switch was the problem.  I set up internet connection sharing on my PowerMac G5, as it was my only client machine with two NICs.  I connected the second nic back to my switch, and plugged my wireless acces point (private, WPA2-PSK) into the same switch.  Performance was still dandy throughout my house.

What could be causing the performance problems?  Netperf seemed like a good way to test the NICs in my endian machine, but it was not included in the distro, and I'm not quite sure how to use it.

Re: Performance problems - bandwidth restricted

by Howard Fleming :: Rate this Message:

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If you are running 100 mb on your nic's, I would lock everything down to
  half duplex, and see if that makes any difference.

Howard


Ed Noepel wrote:

> When using endian FW, my downstream performance was limited to ~300kb/sec,
> upstream ~15kb/sec.  Netstat showed no suspicious connections, and the
> bandwidth chart did not show suspicious activity.  I turned off all services
> spare DHCP, which had no effect on the problem.  Naturally, I thought I was
> dealing with a cap.  I found this not to be the case by plugging a
> (non-windows) client machine directly into my cable modem; I then got the
> expected 8mb/sec downstream, 900k/sec upstream.
>
> Next I checked networking hardware, thinking my switch was the problem.  I
> set up internet connection sharing on my PowerMac G5, as it was my only
> client machine with two NICs.  I connected the second nic back to my switch,
> and plugged my wireless acces point (private, WPA2-PSK) into the same
> switch.  Performance was still dandy throughout my house.
>
> What could be causing the performance problems?  Netperf seemed like a good
> way to test the NICs in my endian machine, but it was not included in the
> distro, and I'm not quite sure how to use it.

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Re: Performance problems - bandwidth restricted

by Ed Noepel :: Rate this Message:

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I played musical network cards, moving my three PCI NICs to different slots.  My onboard NIC would be hard to move, I left that alone.  I also reconfigured which interfaces (red,green,blue,yellow) belonged to which card (swapping eth0 with eth1).  After rebooting the machine, everything seems fine. ^o_O^