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authorAlexander Duyck <alexander.h.duyck@intel.com>2008-09-13 04:57:23 +0400
committerDavid S. Miller <davem@davemloft.net>2008-09-13 04:57:23 +0400
commitf07d1501292b3b0d3276ee0e537005526a45e242 (patch)
treedf132456469046ec7f71ea4ac39723450c8e3c6e /Documentation/networking/multiqueue.txt
parent67333bb5679325db310bb612c1de3e6e47bb0043 (diff)
downloadlinux-f07d1501292b3b0d3276ee0e537005526a45e242.tar.xz
multiq: Further multiqueue cleanup
This patch resolves a few issues found with multiq including wording suggestions and a problem seen in the allocation of queues. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/networking/multiqueue.txt')
-rw-r--r--Documentation/networking/multiqueue.txt14
1 files changed, 7 insertions, 7 deletions
diff --git a/Documentation/networking/multiqueue.txt b/Documentation/networking/multiqueue.txt
index 8c2b06b77f61..4caa0e314cc2 100644
--- a/Documentation/networking/multiqueue.txt
+++ b/Documentation/networking/multiqueue.txt
@@ -29,15 +29,15 @@ Section 2: Qdisc support for multiqueue devices
-----------------------------------------------
-Currently two qdiscs support multiqueue devices. The first is the default
-pfifo_fast qdisc. This qdisc supports one qdisc per hardware queue. A new
-round-robin qdisc, sch_multiq also supports multiple hardware queues. The
+Currently two qdiscs are optimized for multiqueue devices. The first is the
+default pfifo_fast qdisc. This qdisc supports one qdisc per hardware queue.
+A new round-robin qdisc, sch_multiq also supports multiple hardware queues. The
qdisc is responsible for classifying the skb's and then directing the skb's to
bands and queues based on the value in skb->queue_mapping. Use this field in
the base driver to determine which queue to send the skb to.
-sch_multiq has been added for hardware that wishes to avoid unnecessary
-requeuing. It will cycle though the bands and verify that the hardware queue
+sch_multiq has been added for hardware that wishes to avoid head-of-line
+blocking. It will cycle though the bands and verify that the hardware queue
associated with the band is not stopped prior to dequeuing a packet.
On qdisc load, the number of bands is based on the number of queues on the
@@ -63,8 +63,8 @@ band 1 => queue 1
band 2 => queue 2
band 3 => queue 3
-Traffic will begin flowing through each queue if your base device has either
-the default simple_tx_hash or a custom netdev->select_queue() defined.
+Traffic will begin flowing through each queue based on either the simple_tx_hash
+function or based on netdev->select_queue() if you have it defined.
The behavior of tc filters remains the same. However a new tc action,
skbedit, has been added. Assuming you wanted to route all traffic to a