igbvf: refactor Interrupt Throttle Rate code

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The existing ITR code is broken and confusing, with lots of similarly-named
variables that do different things. Additionally, after the driver carefully
determines the optimal interrupt rate for the adapter, it then
ignores it and always writes a fixed, suboptimal value.

This patch refactors that code to make variable names more descriptive of
what they actually do, and then actually writes the calculated result to
the hardware.

Preliminary testing shows that netperf TCP_STREAM tests goes from ~918Mbps
to ~940Mbps, and TCP_RR goes from ~2k transactions/sec up to > 8k.

Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Tested-by: Robert E Garrett <robertX.e.garrett@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

...

This commit is contained in:

Mitch A Williams 2012-01-14 08:10:50 +00:00 • committed by Jeff Kirsher

parent 59d74026fa

commit ab50a2a430

3 changed files with 99 additions and 78 deletions

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19

drivers/net/ethernet/intel/igbvf/ethtool.c

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27

drivers/net/ethernet/intel/igbvf/igbvf.h

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129

drivers/net/ethernet/intel/igbvf/netdev.c

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