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tcp.7: ffix

This commit is contained in:
Michael Kerrisk 2008-11-21 18:06:31 -05:00
parent 418d8232f0
commit 95e6bcfc3b
1 changed files with 17 additions and 13 deletions
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@ -485,23 +485,25 @@ available memory.
.I "low memory" .I "low memory"
for this, which is limited to around 900 megabytes on 32-bit systems. for this, which is limited to around 900 megabytes on 32-bit systems.
64-bit systems do not suffer this limitation.) 64-bit systems do not suffer this limitation.)
.RS
.TP 10
.I low .I low
- TCP doesn't regulate its memory allocation when the number TCP doesn't regulate its memory allocation when the number
of pages it has allocated globally is below this number. of pages it has allocated globally is below this number.
.TP
.I pressure .I pressure
- when the amount of memory allocated by TCP When the amount of memory allocated by TCP
exceeds this number of pages, TCP moderates its memory consumption. exceeds this number of pages, TCP moderates its memory consumption.
This memory pressure state is exited This memory pressure state is exited
once the number of pages allocated falls below once the number of pages allocated falls below
the the
.I low .I low
mark. mark.
.TP
.I high .I high
- the maximum number of pages, globally, that TCP will allocate. The maximum number of pages, globally, that TCP will allocate.
This value overrides any other limits imposed by the kernel. This value overrides any other limits imposed by the kernel.
.RE
.TP .TP
.IR tcp_mtu_probing " (integer; default: 0; since Linux 2.6.17)" .IR tcp_mtu_probing " (integer; default: 0; since Linux 2.6.17)"
.\" The following is from 2.6.28-rc4: Documentation/networking/ip-sysctl.txt .\" The following is from 2.6.28-rc4: Documentation/networking/ip-sysctl.txt
@ -582,7 +584,7 @@ TCP dynamically adjusts the size of the
receive buffer from the defaults listed below, in the range receive buffer from the defaults listed below, in the range
of these values, depending on memory available in the system. of these values, depending on memory available in the system.
.RS .RS
.TP 9 .TP 10
.I min .I min
minimum size of the receive buffer used by each TCP socket. minimum size of the receive buffer used by each TCP socket.
The default value is the system page size. The default value is the system page size.
@ -757,9 +759,10 @@ These parameters are used by TCP to regulate send buffer sizes.
TCP dynamically adjusts the size of the send buffer from the TCP dynamically adjusts the size of the send buffer from the
default values listed below, in the range of these values, default values listed below, in the range of these values,
depending on memory available. depending on memory available.
.RS
.TP 10
.I min .I min
- minimum size of the send buffer used by each TCP socket. Minimum size of the send buffer used by each TCP socket.
The default value is the system page size. The default value is the system page size.
(On Linux 2.4, the default value is 4K bytes.) (On Linux 2.4, the default value is 4K bytes.)
This value is used to ensure that in memory pressure mode, This value is used to ensure that in memory pressure mode,
@ -767,9 +770,9 @@ allocations below this size will still succeed.
This is not used to bound the size of the send buffer declared using This is not used to bound the size of the send buffer declared using
.B SO_SNDBUF .B SO_SNDBUF
on a socket. on a socket.
.TP
.I default .I default
- the default size of the send buffer for a TCP socket. The default size of the send buffer for a TCP socket.
This value overwrites the initial default buffer size from This value overwrites the initial default buffer size from
the generic global the generic global
.I net.core.wmem_default .I net.core.wmem_default
@ -781,9 +784,9 @@ should be increased (to affect all sockets).
To employ large TCP windows, the To employ large TCP windows, the
.I /proc/sys/net/ipv4/tcp_window_scaling .I /proc/sys/net/ipv4/tcp_window_scaling
must be set to a non-zero value (default). must be set to a non-zero value (default).
.TP
.I max .I max
- the maximum size of the send buffer used by each TCP socket. The maximum size of the send buffer used by each TCP socket.
This value does not override the value in This value does not override the value in
.IR /proc/sys/net/core/wmem_max . .IR /proc/sys/net/core/wmem_max .
This is not used to limit the size of the send buffer declared using This is not used to limit the size of the send buffer declared using
@ -795,6 +798,7 @@ The default value is calculated using the formula
(On Linux 2.4, the default value is 128K bytes, (On Linux 2.4, the default value is 128K bytes,
lowered 64K depending on low-memory systems.) lowered 64K depending on low-memory systems.)
.RE
.TP .TP
.IR tcp_workaround_signed_windows " (Boolean; default: disabled; since Linux 2.6.26)" .IR tcp_workaround_signed_windows " (Boolean; default: disabled; since Linux 2.6.26)"
If enabled, assume that no receipt of a window-scaling option means that the If enabled, assume that no receipt of a window-scaling option means that the