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Re: GBit performance problem with nfs client

On Wed, 07 Jun 2006, Gordon Grubert wrote:
> I have a file server running on Sarge AMD64 connected
> with a 1GBit interface to a GBit uplink off the switch.
> Do not think that this sounds like a common problem. It isn't!!!


> The most interesting fact is, that I obtain about 10MB/s with
> my Debian client if I connect the file server to a 100MBit Port
> on the switch.

What gbit NIC, which driver, which driver version?  Does the driver exibit
different ping times (especially on *variance*) when in 1GB when compared to
100MB?   Is the entire *electrical path* from the GB nic to the switch
validated to be CAT5e?  Did you try different cabling?

Bad cables (no matter if they were *sold* as CAT5e, half the time that is a
gross lie) can really hose GBIT and still be more than good enough for
100MB/s, and actually deliver better performance at 100MB/s.

Also, some GBIT NICs require fairly new drivers (read: 2.6.17-rc) and
sometimes even patches to really work right.

  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh

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