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| author | Jesse Brandeburg <jesse.brandeburg@intel.com> | 2009-07-06 10:44:20 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-07-06 18:07:47 -0700 |
| commit | 94c9e5a89349a1f1ebabe0876c059dc387b8b2a0 (patch) | |
| tree | 77ca6e744fdcdbe129e2b8ec06132c1f36f5aa27 /drivers/net/e1000/e1000.h | |
| parent | f77139c07a0e1dd164e039320ada50111f899223 (diff) | |
| download | blackbird-obmc-linux-94c9e5a89349a1f1ebabe0876c059dc387b8b2a0.tar.gz blackbird-obmc-linux-94c9e5a89349a1f1ebabe0876c059dc387b8b2a0.zip | |
e1000: allow ethtool coalesece to adjust interrupts per second
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>
Diffstat (limited to 'drivers/net/e1000/e1000.h')
| -rw-r--r-- | drivers/net/e1000/e1000.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/e1000/e1000.h b/drivers/net/e1000/e1000.h index e9a416f40162..c87f2cbdbae3 100644 --- a/drivers/net/e1000/e1000.h +++ b/drivers/net/e1000/e1000.h @@ -111,6 +111,9 @@ do { \ #define E1000_MIN_RXD 80 #define E1000_MAX_82544_RXD 4096 +#define E1000_MIN_ITR_USECS 10 /* 100000 irq/sec */ +#define E1000_MAX_ITR_USECS 10000 /* 100 irq/sec */ + /* this is the size past which hardware will drop packets when setting LPE=0 */ #define MAXIMUM_ETHERNET_VLAN_SIZE 1522 |
