e1000e: slow performance between two 82579 connected via 10Mbit hub

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Two 82579 LOMs connected via a 10Mb hub experience extraordinarily low
performance.  This is because 82579 is excessively aggressive on transmit
at 10Mb half-duplex and will not provide sufficient time for the link
partner to transmit.  When the link partner is also 82579, the result is a
lot of collisions (and corresponding re-transmits) that cause the poor
performance. To work-around this issue, significantly increase the IPG in
the MAC to allow enough gap for the link partner to transmit and reduce the
Rx latency in the analog PHY to 0 to reduce the number of collisions.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Tested-by: Jeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

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Bruce Allan 2013-03-06 09:02:36 +00:00 • committed by Jeff Kirsher

parent bb034512da

commit 772d05c51c

3 changed files with 30 additions and 0 deletions

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1

drivers/net/ethernet/intel/e1000e/defines.h

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28

drivers/net/ethernet/intel/e1000e/ich8lan.c

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1

drivers/net/ethernet/intel/e1000e/ich8lan.h

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