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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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9
Documentation/networking/scaling.txt
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@@ -421,6 +421,15 @@ best CPUs to share a given queue are probably those that share the cache
with the CPU that processes transmit completions for that queue
(transmit interrupts).
Per TX Queue rate limitation:
=============================
These are rate-limitation mechanisms implemented by HW, where currently
a max-rate attribute is supported, by setting a Mbps value to
/sys/class/net/<dev>/queues/tx-<n>/tx_maxrate
A value of zero means disabled, and this is the default.
Further Information
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