Documentation: e1000: Update kernel documentation
Updated the e1000.txt kernel documentation with the latest information. Also convert the text file to reStructuredText (RST) format, since the Linux kernel documentation now uses this format for documentation. Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Tested-by: Aaron Brown <aaron.f.brown@intel.com>hifive-unleashed-5.1
Jeff Kirsher
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@ -154,7 +154,7 @@ NOTE: When e1000 is loaded with default settings and multiple adapters
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are in use simultaneously, the CPU utilization may increase non-
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linearly. In order to limit the CPU utilization without impacting
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the overall throughput, we recommend that you load the driver as
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follows:
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follows::
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modprobe e1000 InterruptThrottleRate=3000,3000,3000
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@ -167,8 +167,8 @@ NOTE: When e1000 is loaded with default settings and multiple adapters
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RxDescriptors
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-------------
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Valid Range: 80-256 for 82542 and 82543-based adapters
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80-4096 for all other supported adapters
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Valid Range: 48-256 for 82542 and 82543-based adapters
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48-4096 for all other supported adapters
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Default Value: 256
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This value specifies the number of receive buffer descriptors allocated
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@ -230,8 +230,8 @@ speed. Duplex should also be set when Speed is set to either 10 or 100.
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TxDescriptors
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-------------
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Valid Range: 80-256 for 82542 and 82543-based adapters
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80-4096 for all other supported adapters
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Valid Range: 48-256 for 82542 and 82543-based adapters
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48-4096 for all other supported adapters
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Default Value: 256
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This value is the number of transmit descriptors allocated by the driver.
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@ -242,41 +242,10 @@ NOTE: Depending on the available system resources, the request for a
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higher number of transmit descriptors may be denied. In this case,
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use a lower number.
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TxDescriptorStep
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----------------
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Valid Range: 1 (use every Tx Descriptor)
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4 (use every 4th Tx Descriptor)
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Default Value: 1 (use every Tx Descriptor)
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On certain non-Intel architectures, it has been observed that intense TX
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traffic bursts of short packets may result in an improper descriptor
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writeback. If this occurs, the driver will report a "TX Timeout" and reset
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the adapter, after which the transmit flow will restart, though data may
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have stalled for as much as 10 seconds before it resumes.
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The improper writeback does not occur on the first descriptor in a system
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memory cache-line, which is typically 32 bytes, or 4 descriptors long.
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Setting TxDescriptorStep to a value of 4 will ensure that all TX descriptors
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are aligned to the start of a system memory cache line, and so this problem
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will not occur.
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NOTES: Setting TxDescriptorStep to 4 effectively reduces the number of
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TxDescriptors available for transmits to 1/4 of the normal allocation.
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This has a possible negative performance impact, which may be
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compensated for by allocating more descriptors using the TxDescriptors
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module parameter.
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There are other conditions which may result in "TX Timeout", which will
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not be resolved by the use of the TxDescriptorStep parameter. As the
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issue addressed by this parameter has never been observed on Intel
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Architecture platforms, it should not be used on Intel platforms.
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TxIntDelay
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----------
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Valid Range: 0-65535 (0=off)
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Default Value: 64
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Default Value: 8
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This value delays the generation of transmit interrupts in units of
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1.024 microseconds. Transmit interrupt reduction can improve CPU
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@ -288,7 +257,7 @@ TxAbsIntDelay
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-------------
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(This parameter is supported only on 82540, 82545 and later adapters.)
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Valid Range: 0-65535 (0=off)
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Default Value: 64
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Default Value: 32
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This value, in units of 1.024 microseconds, limits the delay in which a
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transmit interrupt is generated. Useful only if TxIntDelay is non-zero,
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@ -310,7 +279,7 @@ Copybreak
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---------
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Valid Range: 0-xxxxxxx (0=off)
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Default Value: 256
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Usage: insmod e1000.ko copybreak=128
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Usage: modprobe e1000.ko copybreak=128
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Driver copies all packets below or equaling this size to a fresh RX
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buffer before handing it up the stack.
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@ -328,14 +297,6 @@ Default Value: 0 (disabled)
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Allows PHY to turn off in lower power states. The user can turn off
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this parameter in supported chipsets.
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KumeranLockLoss
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---------------
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Valid Range: 0-1
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Default Value: 1 (enabled)
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This workaround skips resetting the PHY at shutdown for the initial
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silicon releases of ICH8 systems.
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Speed and Duplex Configuration
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==============================
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@ -397,12 +358,12 @@ Additional Configurations
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------------
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Jumbo Frames support is enabled by changing the MTU to a value larger than
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the default of 1500. Use the ifconfig command to increase the MTU size.
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For example:
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For example::
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ifconfig eth<x> mtu 9000 up
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This setting is not saved across reboots. It can be made permanent if
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you add:
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you add::
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MTU=9000
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@ -11,6 +11,7 @@ Contents:
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can
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dpaa2/index
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e100
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e1000
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kapi
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z8530book
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msg_zerocopy
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@ -7090,7 +7090,7 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/net-queue.git
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T: git git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/next-queue.git
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S: Supported
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F: Documentation/networking/e100.rst
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F: Documentation/networking/e1000.txt
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F: Documentation/networking/e1000.rst
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F: Documentation/networking/e1000e.txt
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F: Documentation/networking/igb.txt
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F: Documentation/networking/igbvf.txt
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