Registry Parameter by 5J3LR8

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									Microsoft recommends the following registry changes for performance tuning of specific
vendors Gigabit Ethernet Adapters:

                               Default   Recommended
       Registry Parameter                                      Description
                                Value        Value
Compaq Gigabit Adapter (Intel-based)
CoaleseceBuffers                 8           32        Number of buffers before
                                                       an interrupt occurs
ReceiveBuffers                   48         500        Number of posted receive
                                                       buffers on the adapter
Alteon - ACENic
TransmitControlBlocks            32          64        Number of transmits
                                                       queued up in the miniport
HostTracing                      1           1         Enable debugging on host
                                                       system
JumboFrames                     Off          -         Enable Jumbo Frame
                                                       mode
JumboMtu                       1500          -         Specify MTU size
                                                       depending on Jumbo
                                                       Frames entry
LinkNegotiation                 On          On         Negotiate link before
                                                       declaring it active
NicTracing                       0           0         Enable debugging on
                                                       adapter
PciReadMax                       0           0         Amount of data read per
                                                       burst from host system to
                                                       adapter
RecvCoalMax                      3           20        Max number of buffers
                                                       received before
                                                       interrupting
RecvCoalTicks                  1000         1000       Max number of clock ticks
                                                       before sending an
                                                       interrupt
SendCoalMax                      0           20        Max number of buffers
                                                       sent before interrupting
SendCoalTicks                 100000        1000       Max number of clock ticks
                                                       before sending an
                                                       interrupt
Intel Pro 1000
NumberOfReceiveBuffers          200         768        Number of posted receive
                                                       buffers on the adapter
NumberOfCoalesceBuffers         200         512        Number of buffers before
                                                       an interrupt occurs
                              Default   Recommended
      Registry Parameter                                      Description
                               Value        Value
NumberOfTransmitDescriptors   448           512       Number of transmit buffer
                                                      descriptors on the adapter
ReceiveChecksumOffloading      Off           On       Task offloading onto
                                                      hardware in receiver path
TransmitChecksumOffloading     On            On       Task offloading onto
                                                      hardware in sender path
SysKonnect SKNET
HardwareChecksumming           On            On       Enable task offloading
                                                      onto hardware
MaxFragstoDMAperTxFrame         5            5        The maximum number of
                                                      allowed fragments per TX
                                                      frame; set to 0 lets driver
                                                      always copy all fragments
MaxIRQperSec                  5000           0        The maximum number of
                                                      IRQ/sec; values < 1000
                                                      will be treated as 1000
MaximumFrameSize              1514            -       Maximum Transmission
                                                      Unit (MTU)
MinFragLengthforDMA           100           100       Minimum length of a TX
                                                      fragment to be transferred
                                                      by means of direct
                                                      memory access (DMA);
                                                      set to 0 disables fragment
                                                      coalescing
NumberOfReceiveBuffers        100           100       Number of posted receive
                                                      buffers on the adapter
NumberOfTransmitBuffers        50            50       Number of posted send
                                                      buffers on the adapter
WaitforRxResources             On       Off for Jumbo Checks for receive
                                                      resources before waiting
                                                      to get them back from the
                                                      protocol


These settings are changed in the adapters Advanced Configuration Tab, this found in the
network cards properties accessed from Device Manager. If the Advanced Configuration Tab
does not contain these settings you will need to contact the manufacturer for either updated
drivers or where these changes can be made.

For the full context of the Microsoft Windows 2000 Performance Tuning White Paper go to
http://www.microsoft.com/windows2000/professional/evaluation/performance/reports/perftune.a
sp

								
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