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  1. 18 2月, 2007 1 次提交
  3. 06 2月, 2007 2 次提交
  5. 02 12月, 2006 3 次提交
    • J
      e1000: add dynamic itr modes · 835bb129
      由 Jesse Brandeburg 提交于 
      Add a new dynamic itr algorithm, with 2 modes, and make it the default
operation mode. This greatly reduces latency and increases small packet
performance, at the "cost" of some CPU utilization. Bulk traffic
throughput is unaffected.

The driver can limit the amount of interrupts per second that the
adapter will generate for incoming packets. It does this by writing a
value to the adapter that is based on the maximum amount of interrupts
that the adapter will generate per second.

Setting InterruptThrottleRate to a value greater or equal to 100 will
program the adapter to send out a maximum of that many interrupts per
second, even if more packets have come in. This reduces interrupt
load on the system and can lower CPU utilization under heavy load,
but will increase latency as packets are not processed as quickly.

The default behaviour of the driver previously assumed a static
InterruptThrottleRate value of 8000, providing a good fallback value
for all traffic types,but lacking in small packet performance and
latency. The hardware can handle many more small packets per second
however, and for this reason an adaptive interrupt moderation algorithm
was implemented.

Since 7.3.x, the driver has two adaptive modes (setting 1 or 3) in
which it dynamically adjusts the InterruptThrottleRate value based on
the traffic that it receives. After determining the type of incoming
traffic in the last timeframe, it will adjust the InterruptThrottleRate
to an appropriate value for that traffic.

The algorithm classifies the incoming traffic every interval into
classes.  Once the class is determined, the InterruptThrottleRate
value is adjusted to suit that traffic type the best. There are
three classes defined: "Bulk traffic", for large amounts of packets
of normal size; "Low latency", for small amounts of traffic and/or
a significant percentage of small packets; and "Lowest latency",
for almost completely small packets or minimal traffic.

In dynamic conservative mode, the InterruptThrottleRate value is
set to 4000 for traffic that falls in class "Bulk traffic". If
traffic falls in the "Low latency" or "Lowest latency" class, the
InterruptThrottleRate is increased stepwise to 20000. This default
mode is suitable for most applications.

For situations where low latency is vital such as cluster or
grid computing, the algorithm can reduce latency even more when
InterruptThrottleRate is set to mode 1. In this mode, which operates
the same as mode 3, the InterruptThrottleRate will be increased
stepwise to 70000 for traffic in class "Lowest latency".

Setting InterruptThrottleRate to 0 turns off any interrupt moderation
and may improve small packet latency, but is generally not suitable
for bulk throughput traffic.
Signed-off-by: NJesse Brandeburg <jesse.brandeburg@intel.com>
Cc: Rick Jones <rick.jones2@hp.com>
Signed-off-by: NAuke Kok <auke-jan.h.kok@intel.com>
      835bb129
    • J
      e1000: add queue restart counter · fcfb1224
      由 Jesse Brandeburg 提交于 
      Add a netif_wake/start_queue counter to the ethtool statistics to indicated
to the user that their transmit ring could be too small for their workload.
Signed-off-by: NJesse brandeburg <jesse.brandeburg@intel.com>
Cc: Jamal Hadi <hadi@cyberus.ca>
Signed-off-by: NAuke Kok <auke-jan.h.kok@intel.com>
      fcfb1224
    • A
      e1000: FIX: enable hw TSO for IPV6 · 87ca4e5b
      由 Auke Kok 提交于 
      Enable TSO for IPV6. All e1000 hardware supports it. This reduces CPU
utilizations by 50% when transmitting IPv6 frames.

Fix symbol naming enabling ipv6 TSO. Turn off TSO6 for 10/100.
Signed-off-by: NAuke Kok <auke-jan.h.kok@intel.com>
      87ca4e5b
  7. 28 9月, 2006 3 次提交
  9. 01 9月, 2006 1 次提交
  11. 29 8月, 2006 2 次提交
  13. 15 7月, 2006 1 次提交
  15. 01 7月, 2006 1 次提交
  17. 28 6月, 2006 3 次提交
  19. 15 4月, 2006 3 次提交
  21. 12 3月, 2006 1 次提交
  23. 03 3月, 2006 5 次提交
  25. 01 3月, 2006 1 次提交
    • J
      [PATCH] e1000: revert to single descriptor for legacy receive path · a1415ee6
      由 Jeff Kirsher 提交于 
      A recent patch attempted to enable more efficient memory usage by using
only 2kB descriptors for jumbo frames.  The method used to implement this
has since been commented upon as "illegal" and in recent kernels even
causes a BUG when receiving ip fragments while using jumbo frames.
This patch simply goes back to the way things were.  We expect some
complaints due to order 3 allocations failing to come back due to this
change.
Signed-off-by: NJesse Brandeburg <jesse.brandeburg@intel.com>
      a1415ee6
  27. 17 1月, 2006 6 次提交
  29. 13 12月, 2005 1 次提交
  31. 04 10月, 2005 2 次提交
  33. 27 6月, 2005 2 次提交
  35. 13 5月, 2005 2 次提交