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Despite installing and enabling the 10G fiber card, data copy or transfer is still happening on a 1G rate.

piyush128k
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  • You seem to have forgotten to add units to your bandwidth rates. There's quite a difference between GB and Gb. In fact, 1GB/s is about the expected transfer rate for a 10Gb card. – Ladadadada Aug 05 '13 at 09:50

1 Answers1

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I'm not surprised.

  1. Increasing the MTU has to happen on all network devices in the segment, all switches, all NICs, etc.
  2. Many file copy mechanisms are single-threaded, and as you don't say which one you're using, but I bet it's rsync or NFS, the performance is severely limited by the capability of a single thread to hammer away at 10Gbit.
  3. Are you sure your values are in Gigabits/second, not Gigabytes/second, as there's a factor of 8 difference there.. Could be the cause of some confusion.
  4. There's a huge load of options for configuring a 10Gbit NIC's drivers, TCP timestamping, offload, synchronous ACK, all of which can limit the performance of a 10Gbit NIC.

I know this is for Linux, and you're on SunOS, but have a read of this: http://landley.net/kdocs/ols/2009/ols2009-pages-169-184.pdf

Tom O'Connor
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