> Both HFSC and fq_codel have problems, but I'm not sure if these are > relevant for your 4.5.5 kernel. > I'll submit a hfsc patch soon (it does fix a real problem). I'm actually QoSing around 5 Gbit/s on some machines with HFSC, without any problems, with SFQ though. Feel free to contact me if you need some testing ground.
> > If you have any config knobs enabled on the fq_codel leaf qdiscs it > would be good to know what parameters are used. "all default". Codels look like this: qdisc codel 573b: dev ifb1 parent 1:573b limit 1000p target 5.0ms interval 100.0ms Sent 64451468 bytes 43164 pkt (dropped 29, overlimits 0 requeues 0) backlog 0b 0p requeues 0 count 3 lastcount 1 ldelay 2us drop_next 0us maxpacket 1536 ecn_mark 0 drop_overlimit 0 > > Can you try this patch (it doesn't fix anything but might provide more info): > [...patch...] The output is attached below. If I got it correctly from my weak knowledge of HFSC internals there's a packet that somehow appears in the queue without having the fit time set? -mk [ 1476.685712] ------------[ cut here ]------------ [ 1476.685728] WARNING: CPU: 16 PID: 0 at net/sched/sch_hfsc.c:1426 hfsc_dequeue+0x30f/0x3a0 [sch_hfsc]() [ 1476.685731] Modules linked in: sch_fq_codel(E) act_mirred(E) act_gact(E) sch_ingress(E) sch_codel(E) sch_sfq(E) cls_u32(E) sch_hfsc(E) ext4(E) x86_pkg_temp_thermal(E) crc16(E) mbcache(E) jbd2(E) intel_powerclamp(E) coretemp(E) kvm_intel(E) kvm(E) irqbypass(E) crct10dif_pclmul(E) crc32_pclmul(E) ghash_clmulni_intel(E) hmac(E) drbg(E) ansi_cprng(E) aesni_intel(E) aes_x86_64(E) joydev(E) lrw(E) gf128mul(E) sg(E) iTCO_wdt(E) iTCO_vendor_support(E) glue_helper(E) mgag200(E) snd_pcm(E) snd_timer(E) snd(E) soundcore(E) ipmi_devintf(E) ablk_helper(E) cryptd(E) ttm(E) drm_kms_helper(E) drm(E) i2c_algo_bit(E) evdev(E) wmi(E) acpi_power_meter(E) 8250_fintek(E) pcspkr(E) acpi_pad(E) ipmi_si(E) ipmi_msghandler(E) sb_edac(E) button(E) shpchp(E) edac_core(E) mei_me(E) mei(E) tpm_tis(E) lpc_ich(E) mfd_core(E) tpm(E) [ 1476.685779] processor(E) ifb(E) autofs4(E) xfs(E) libcrc32c(E) hid_generic(E) usbhid(E) hid(E) sd_mod(E) sr_mod(E) cdrom(E) crc32c_intel(E) ixgbe(E) dca(E) vxlan(E) ip6_udp_tunnel(E) udp_tunnel(E) mdio(E) ahci(E) libahci(E) ehci_pci(E) libata(E) tg3(E) ehci_hcd(E) ptp(E) pps_core(E) usbcore(E) libphy(E) megaraid_sas(E) usb_common(E) scsi_mod(E) fjes(E) [ 1476.685808] CPU: 16 PID: 0 Comm: swapper/16 Tainted: G E 4.5.5 #1 [ 1476.685810] Hardware name: /08DM12, BIOS 2.1.2 01/20/2014 [ 1476.685812] 0000000000000286 2a3bd3d7e60bafde ffffffff81302ff5 0000000000000000 [ 1476.685815] ffffffffc04fb049 ffffffff81078ced 0000000000000000 0000000000000000 [ 1476.685818] ffff880c13411000 ffff880c13411490 ffff88003679a300 ffffffffc04f955f [ 1476.685821] Call Trace: [ 1476.685823] <IRQ> [<ffffffff81302ff5>] ? dump_stack+0x5c/0x77 [ 1476.685834] [<ffffffff81078ced>] ? warn_slowpath_common+0x7d/0xb0 [ 1476.685838] [<ffffffffc04f955f>] ? hfsc_dequeue+0x30f/0x3a0 [sch_hfsc] [ 1476.685842] [<ffffffff814db925>] ? __qdisc_run+0x65/0x190 [ 1476.685848] [<ffffffff814b33f6>] ? net_tx_action+0xd6/0x230 [ 1476.685854] [<ffffffff8107d4c8>] ? __do_softirq+0xf8/0x290 [ 1476.685857] [<ffffffff8107d7ab>] ? irq_exit+0x9b/0xa0 [ 1476.685861] [<ffffffff815b519e>] ? smp_apic_timer_interrupt+0x3e/0x50 [ 1476.685864] [<ffffffff815b34a2>] ? apic_timer_interrupt+0x82/0x90 [ 1476.685865] <EOI> [<ffffffff8147dbf8>] ? cpuidle_enter_state+0x118/0x2c0 [ 1476.685870] [<ffffffff8147dbe5>] ? cpuidle_enter_state+0x105/0x2c0 [ 1476.685874] [<ffffffff810b8837>] ? cpu_startup_entry+0x287/0x340 [ 1476.685884] [<ffffffff8104d40a>] ? start_secondary+0x15a/0x190 [ 1476.685887] ---[ end trace 3c736fc106257086 ]--- [ 1476.685890] qlen 1 droplist_empty: 1, cfmin 0, minel 0, root_empty 1 [ 1476.685901] qlen 1 droplist_empty: 1, cfmin 0, minel 0, root_empty 1 [ 1476.685973] qlen 1 droplist_empty: 1, cfmin 0, minel 0, root_empty 1 [ 1476.685982] qlen 1 droplist_empty: 1, cfmin 0, minel 0, root_empty 1 [ 1476.685992] qlen 1 droplist_empty: 1, cfmin 0, minel 0, root_empty 1 [ 1476.685997] qlen 1 droplist_empty: 1, cfmin 0, minel 0, root_empty 1 [ 1476.686000] qlen 1 droplist_empty: 1, cfmin 0, minel 0, root_empty 1 [ 1476.686004] qlen 1 droplist_empty: 1, cfmin 0, minel 0, root_empty 1
