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bc113e46a3
Support for FQ packet scheduler
$ tc qd add dev eth0 root fq help
Usage: ... fq [ limit PACKETS ] [ flow_limit PACKETS ]
[ quantum BYTES ] [ initial_quantum BYTES ]
[ maxrate RATE ] [ buckets NUMBER ]
[ [no]pacing ]
$ tc -s -d qd
qdisc fq 8002: dev eth0 root refcnt 32 limit 10000p flow_limit 100p
buckets 256 quantum 3028 initial_quantum 15140
Sent 216532416 bytes 148395 pkt (dropped 0, overlimits 0 requeues 14)
backlog 0b 0p requeues 14
511 flows (511 inactive, 0 throttled)
110 gc, 0 highprio, 0 retrans, 1143 throttled, 0 flows_plimit
limit : max number of packets on whole Qdisc (default 10000)
flow_limit : max number of packets per flow (default 100)
quantum : the max deficit per RR round (default is 2 MTU)
initial_quantum : initial credit for new flows (default is 10 MTU)
maxrate : max per flow rate (default : unlimited)
buckets : number of RB trees (default : 1024) in hash table.
(consumes 8 bytes per bucket)
[no]pacing : disable/enable pacing (default is enable)
Usage :
tc qdisc add dev $ETH root fq
tc qdisc del dev $ETH root 2>/dev/null
tc qdisc add dev $ETH root handle 1: mq
for i in `seq 1 4`
do
tc qdisc add dev $ETH parent 1:$i est 1sec 4sec fq
done
Signed-off-by: Eric Dumazet <edumazet@google.com>
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|---|---|---|
| .. | ||
| .gitignore | ||
| em_canid.c | ||
| em_cmp.c | ||
| em_ipset.c | ||
| em_meta.c | ||
| em_nbyte.c | ||
| em_u32.c | ||
| emp_ematch.l | ||
| emp_ematch.y | ||
| f_basic.c | ||
| f_cgroup.c | ||
| f_flow.c | ||
| f_fw.c | ||
| f_route.c | ||
| f_rsvp.c | ||
| f_tcindex.c | ||
| f_u32.c | ||
| m_action.c | ||
| m_csum.c | ||
| m_ematch.c | ||
| m_ematch.h | ||
| m_estimator.c | ||
| m_gact.c | ||
| m_ipt.c | ||
| m_mirred.c | ||
| m_nat.c | ||
| m_pedit.c | ||
| m_pedit.h | ||
| m_police.c | ||
| m_skbedit.c | ||
| m_xt_old.c | ||
| m_xt.c | ||
| Makefile | ||
| p_icmp.c | ||
| p_ip.c | ||
| p_tcp.c | ||
| p_udp.c | ||
| q_atm.c | ||
| q_cbq.c | ||
| q_choke.c | ||
| q_codel.c | ||
| q_drr.c | ||
| q_dsmark.c | ||
| q_fifo.c | ||
| q_fq_codel.c | ||
| q_fq.c | ||
| q_gred.c | ||
| q_hfsc.c | ||
| q_htb.c | ||
| q_ingress.c | ||
| q_mqprio.c | ||
| q_multiq.c | ||
| q_netem.c | ||
| q_prio.c | ||
| q_qfq.c | ||
| q_red.c | ||
| q_rr.c | ||
| q_sfb.c | ||
| q_sfq.c | ||
| q_tbf.c | ||
| README.last | ||
| static-syms.c | ||
| tc_cbq.c | ||
| tc_cbq.h | ||
| tc_class.c | ||
| tc_common.h | ||
| tc_core.c | ||
| tc_core.h | ||
| tc_estimator.c | ||
| tc_filter.c | ||
| tc_monitor.c | ||
| tc_qdisc.c | ||
| tc_red.c | ||
| tc_red.h | ||
| tc_stab.c | ||
| tc_util.c | ||
| tc_util.h | ||
| tc.c | ||
Kernel code and interface. -------------------------- * Compile time switches There is only one, but very important, compile time switch. It is not settable by "make config", but should be selected manually and after a bit of thinking in <include/net/pkt_sched.h> PSCHED_CLOCK_SOURCE can take three values: PSCHED_GETTIMEOFDAY PSCHED_JIFFIES PSCHED_CPU PSCHED_GETTIMEOFDAY Default setting is the most conservative PSCHED_GETTIMEOFDAY. It is very slow both because of weird slowness of do_gettimeofday() and because it forces code to use unnatural "timeval" format, where microseconds and seconds fields are separate. Besides that, it will misbehave, when delays exceed 2 seconds (f.e. very slow links or classes bounded to small slice of bandwidth) To resume: as only you will get it working, select correct clock source and forget about PSCHED_GETTIMEOFDAY forever. PSCHED_JIFFIES Clock is derived from jiffies. On architectures with HZ=100 granularity of this clock is not enough to make reasonable bindings to real time. However, taking into account Linux architecture problems, which force us to use artificial integrated clock in any case, this switch is not so bad for schduling even on high speed networks, though policing is not reliable. PSCHED_CPU It is available only for alpha and pentiums with correct CPU timestamp. It is the fastest way, use it when it is available, but remember: not all pentiums have this facility, and a lot of them have clock, broken by APM etc. etc.