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net: add low latency socket poll

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Adds an ndo_ll_poll method and the code that supports it.
This method can be used by low latency applications to busy-poll
Ethernet device queues directly from the socket code.
sysctl_net_ll_poll controls how many microseconds to poll.
Default is zero (disabled).
Individual protocol support will be added by subsequent patches.

Signed-off-by: Alexander Duyck <[email protected]>
Signed-off-by: Jesse Brandeburg <[email protected]>
Signed-off-by: Eliezer Tamir <[email protected]>
Acked-by: Eric Dumazet <[email protected]>
Tested-by: Willem de Bruijn <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Eliezer Tamir 2013-06-10 11:39:50 +03:00 • committed by David S. Miller
commit 0602129286
12 changed files with 208 additions and 2 deletions
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12
net/Kconfig
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@ -243,6 +243,18 @@ config NETPRIO_CGROUP
Cgroup subsystem for use in assigning processes to network priorities on
a per-interface basis
config NET_LL_RX_POLL
bool "Low Latency Receive Poll"
depends on X86_TSC
default n
---help---
Support Low Latency Receive Queue Poll.
(For network card drivers which support this option.)
When waiting for data in read or poll call directly into the the device driver
to flush packets which may be pending on the device queues into the stack.
If unsure, say N.
config BQL
boolean
depends on SYSFS