e1000: allow ethtool coalesece to adjust interrupts per second

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This patch allows on-the-fly adjustment of the interrupts per second generated
by e1000 devices 82545/82546 (hardware support of ITR register is a
requirement)

adjust using this command:
ethtool -C eth0 rx-usecs 10

where 10 is 10 microseconds per interrupt interval, so 10 = 100,000 interrupts
per second, and 125 = 8000 interrupts per second.

changes should be immediate.

1,3 are special values and indicate the automatic tuning mode to the driver,
where 1 is 4000-90000 interrupts per second and 3 is 4000-20000 interrupts
per second and is the driver default.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

This commit is contained in:

Jesse Brandeburg 2009-07-06 10:44:20 +00:00 • committed by David S. Miller

parent f77139c07a

commit 94c9e5a893

2 changed files with 53 additions and 1 deletions

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3

drivers/net/e1000/e1000.h

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51

drivers/net/e1000/e1000_ethtool.c

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