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net: Add max rate tx queue attribute

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This adds a tx_maxrate attribute to the tx queue sysfs entry allowing
for max-rate limiting. Along with DCB-ETS and BQL this provides another
knob to tune queue performance. The limit units are Mbps.

By default it is disabled. To disable the rate limitation after it
has been set for a queue, it should be set to zero.

Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John Fastabend 2015-03-18 14:57:33 +02:00 • committed by David S. Miller
parent b65885d29d
commit 822b3b2ebf
4 changed files with 80 additions and 12 deletions
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8
Documentation/ABI/testing/sysfs-class-net-queues
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@ -24,6 +24,14 @@ Description:
Indicates the number of transmit timeout events seen by this
network interface transmit queue.
What: /sys/class/<iface>/queues/tx-<queue>/tx_maxrate
Date: March 2015
KernelVersion: 4.1
Contact: netdev@vger.kernel.org
Description:
A Mbps max-rate set for the queue, a value of zero means disabled,
default is disabled.
What: /sys/class/<iface>/queues/tx-<queue>/xps_cpus
Date: November 2010
KernelVersion: 2.6.38