#endif
--- /dev/null
+++ b/man/man8/tc-cake.8
-@@ -0,0 +1,632 @@
+@@ -0,0 +1,710 @@
+.TH CAKE 8 "19 July 2018" "iproute2" "Linux"
+.SH NAME
+CAKE \- Common Applications Kept Enhanced (CAKE)
+]
+.br
+[
++.BR split-gso*
++|
++.BR no-split-gso
++]
++.br
++[
+.BR ack-filter
+|
+.BR ack-filter-aggressive
+case for Comcast Cable, among others), it is best to use a single queue
+"besteffort" mode with wash.
+
++.PP
++.B split-gso
++
++.br
++ This option controls whether CAKE will split General Segmentation
++Offload (GSO) super-packets into their on-the-wire components and
++dequeue them individually.
++
++.br
++Super-packets are created by the networking stack to improve efficiency.
++However, because they are larger they take longer to dequeue, which
++translates to higher latency for competing flows, especially at lower
++bandwidths. CAKE defaults to splitting GSO packets to achieve the lowest
++possible latency. At link speeds higher than 10 Gbps, setting the
++no-split-gso parameter can increase the maximum achievable throughput by
++retaining the full GSO packets.
++
++.SH OVERRIDING CLASSIFICATION WITH TC FILTERS
++
++CAKE supports overriding of its internal classification of packets through the
++tc filter mechanism. Packets can be assigned to different priority tins by
++setting the
++.B priority
++field on the skb, and the flow hashing can be overridden by setting the
++.B classid
++parameter.
++
++.PP
++.B Tin override
++
++.br
++ To assign a priority tin, the major number of the priority field needs
++to match the qdisc handle of the cake instance; if it does, the minor number
++will be interpreted as the tin index. For example, to classify all ICMP packets
++as 'bulk', the following filter can be used:
++
++.br
++ # tc qdisc replace dev eth0 handle 1: root cake diffserv3
++ # tc filter add dev eth0 parent 1: protocol ip prio 1 \\
++ u32 match icmp type 0 0 action skbedit priority 1:1
++
++.PP
++.B Flow hash override
++
++.br
++ To override flow hashing, the classid can be set. CAKE will interpret
++the major number of the classid as the host hash used in host isolation mode,
++and the minor number as the flow hash used for flow-based queueing. One or both
++of those can be set, and will be used if the relevant flow isolation parameter
++is set (i.e., the major number will be ignored if CAKE is not configured in
++hosts mode, and the minor number will be ignored if CAKE is not configured in
++flows mode).
++
++.br
++This example will assign all ICMP packets to the first queue:
++
++.br
++ # tc qdisc replace dev eth0 handle 1: root cake
++ # tc filter add dev eth0 parent 1: protocol ip prio 1 \\
++ u32 match icmp type 0 0 classid 0:1
++
++.br
++If only one of the host and flow overrides is set, CAKE will compute the other
++hash from the packet as normal. Note, however, that the host isolation mode
++works by assigning a host ID to the flow queue; so if overriding both host and
++flow, the same flow cannot have more than one host assigned. In addition, it is
++not possible to assign different source and destination host IDs through the
++override mechanism; if a host ID is assigned, it will be used as both source and
++destination host.
++
++
++
+.SH EXAMPLES
+# tc qdisc delete root dev eth0
+.br
+ __u64 bandwidth = 0;
+ int ack_filter = -1;
+ struct rtattr *tail;
++ int split_gso = -1;
+ int unlimited = 0;
+ int flowmode = -1;
+ int autorate = -1;
+ int nat = -1;
+ int atm = -1;
+ int mpu = 0;
-+ int split_gso = -1;
+
+ while (argc > 0) {
+ if (strcmp(*argv, "bandwidth") == 0) {
projects / openwrt / openwrt.git / commitdiff