Merge branches 'x86/numa-fixes', 'x86/apic', 'x86/apm', 'x86/bitops', 'x86/build...

[linux-2.6-omap-h63xx.git] / Documentation / networking / ip-sysctl.txt

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 747a5d15d529c8bff449d88802b79b70a213a775..17f1f91af35c7db3e80fed84c5833c80bc48526b 100644 (file)
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -81,23 +81,23 @@ inet_peer_minttl - INTEGER
        Minimum time-to-live of entries.  Should be enough to cover fragment
        time-to-live on the reassembling side.  This minimum time-to-live  is
        guaranteed if the pool size is less than inet_peer_threshold.
-       Measured in jiffies(1).
+       Measured in seconds.
 
 inet_peer_maxttl - INTEGER
        Maximum time-to-live of entries.  Unused entries will expire after
        this period of time if there is no memory pressure on the pool (i.e.
        when the number of entries in the pool is very small).
-       Measured in jiffies(1).
+       Measured in seconds.
 
 inet_peer_gc_mintime - INTEGER
        Minimum interval between garbage collection passes.  This interval is
        in effect under high memory pressure on the pool.
-       Measured in jiffies(1).
+       Measured in seconds.
 
 inet_peer_gc_maxtime - INTEGER
        Minimum interval between garbage collection passes.  This interval is
        in effect under low (or absent) memory pressure on the pool.
-       Measured in jiffies(1).
+       Measured in seconds.
 
 TCP variables: 
 
@@ -184,14 +184,14 @@ tcp_frto - INTEGER
        F-RTO is an enhanced recovery algorithm for TCP retransmission
        timeouts.  It is particularly beneficial in wireless environments
        where packet loss is typically due to random radio interference
-       rather than intermediate router congestion.  FRTO is sender-side
+       rather than intermediate router congestion.  F-RTO is sender-side
        only modification.  Therefore it does not require any support from
        the peer, but in a typical case, however, where wireless link is
        the local access link and most of the data flows downlink, the
-       faraway servers should have FRTO enabled to take advantage of it.
+       faraway servers should have F-RTO enabled to take advantage of it.
        If set to 1, basic version is enabled.  2 enables SACK enhanced
        F-RTO if flow uses SACK.  The basic version can be used also when
-       SACK is in use though scenario(s) with it exists where FRTO
+       SACK is in use though scenario(s) with it exists where F-RTO
        interacts badly with the packet counting of the SACK enabled TCP
        flow.
 
@@ -446,6 +446,33 @@ tcp_dma_copybreak - INTEGER
        and CONFIG_NET_DMA is enabled.
        Default: 4096
 
+UDP variables:
+
+udp_mem - vector of 3 INTEGERs: min, pressure, max
+       Number of pages allowed for queueing by all UDP sockets.
+
+       min: Below this number of pages UDP is not bothered about its
+       memory appetite. When amount of memory allocated by UDP exceeds
+       this number, UDP starts to moderate memory usage.
+
+       pressure: This value was introduced to follow format of tcp_mem.
+
+       max: Number of pages allowed for queueing by all UDP sockets.
+
+       Default is calculated at boot time from amount of available memory.
+
+udp_rmem_min - INTEGER
+       Minimal size of receive buffer used by UDP sockets in moderation.
+       Each UDP socket is able to use the size for receiving data, even if
+       total pages of UDP sockets exceed udp_mem pressure. The unit is byte.
+       Default: 4096
+
+udp_wmem_min - INTEGER
+       Minimal size of send buffer used by UDP sockets in moderation.
+       Each UDP socket is able to use the size for sending data, even if
+       total pages of UDP sockets exceed udp_mem pressure. The unit is byte.
+       Default: 4096
+
 CIPSOv4 Variables:
 
 cipso_cache_enable - BOOLEAN
@@ -767,10 +794,6 @@ tag - INTEGER
        Allows you to write a number, which can be used as required.
        Default value is 0.
 
-(1) Jiffie: internal timeunit for the kernel. On the i386 1/100s, on the
-Alpha 1/1024s. See the HZ define in /usr/include/asm/param.h for the exact
-value on your system. 
-
 Alexey Kuznetsov.
 kuznet@ms2.inr.ac.ru