path: root/Documentation/sysctl
diff options
authorEliezer Tamir <eliezer.tamir@linux.intel.com>2013-06-10 11:39:50 +0300
committerDavid S. Miller <davem@davemloft.net>2013-06-10 21:22:35 -0700
commit060212928670593fb89243640bf05cf89560b023 (patch)
tree32ae5c7be094983fb06430dbe09d36e2b317ca9c /Documentation/sysctl
parentaf12fa6e46aa651e7b86a4c4117b562518fef184 (diff)
net: add low latency socket poll
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 <alexander.h.duyck@intel.com> Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com> Signed-off-by: Eliezer Tamir <eliezer.tamir@linux.intel.com> Acked-by: Eric Dumazet <edumazet@google.com> Tested-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/sysctl')
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/sysctl/net.txt b/Documentation/sysctl/net.txt
index c1f8640c2fc8..85ab72dcdc3c 100644
--- a/Documentation/sysctl/net.txt
+++ b/Documentation/sysctl/net.txt
@@ -50,6 +50,13 @@ The maximum number of packets that kernel can handle on a NAPI interrupt,
it's a Per-CPU variable.
Default: 64
+Low latency busy poll timeout. (needs CONFIG_NET_LL_RX_POLL)
+Approximate time in us to spin waiting for packets on the device queue.
+Recommended value is 50. May increase power usage.
+Default: 0 (off)