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1. #HTB QUANTUM CALCULATOR DRIVERS#
2. #HTB QUANTUM CALCULATOR DRIVER#
3. #HTB QUANTUM CALCULATOR MODS#
4. #HTB QUANTUM CALCULATOR SOFTWARE#
5. #HTB QUANTUM CALCULATOR CODE#

Which have often sprouted similarly “smart” hardware to Ethernet, e.g.ĪDSL/VDSL, which must cover a bandwidth range of 250Kbps to 100Mbps. We are looking into other algorithms than BQL for other network types, Perhaps BQL can be fixed to have a lower limit and just periodically

We would like BQL to autotune better, but as of Linux 4.1, it does not.

High a value for the bandwidth available, etc. 10Mbit and belowġ514 is as low as you can go and it should be even lower.Ĭommon experimental errors: Leaving BQL at autotuning, setting it to too What is needed (and see the last note here about how this furtherĭamages CoDel behavior. ItsĮstimator is often wrong at speeds below 100Mbit, usually double or more BQL was initially developed and tuned at 1 and 10Gbps.

#HTB QUANTUM CALCULATOR DRIVER#

Ethernet BQL (Byte Queue Limits) Driver EnablementīQL rate limits packet service to the device in terms of bytes onĮthernet.

#HTB QUANTUM CALCULATOR DRIVERS#

That in Cake we added offload “peeling” to turnĬonsequently, you must understand the device drivers you are usingīefore benchmarking. The GRO problem is so common now (and so needed in now-shipping devices) We would really like to see GRO and GSO beĭisabled entirely at 100Mbit and below. TSO (GSO) have now appeared, saving a little bit on interrupt processingĪt higher bandwidths, and bloating up packets at all bandwidths,

#HTB QUANTUM CALCULATOR SOFTWARE#

Worse than that, software offloads emulating some DSL hardware, all USB to Ethernet devices) no helpįor them is yet available. Needed for BQL for your devices’s driver)īeware that other network interfaces have often sprouted similar “smart”

#HTB QUANTUM CALCULATOR CODE#

(or, better! take the time to add the 4-8 lines of code If your driver is NOT BQL enabled, you will need to use HTB to emulate They are: As of the last kernel we looked at, support for BQL was in the following multi-queued (and mostly 10GigE) drivers:įind drivers/net/ -name '*.c' -exec fgrep -l \ĭrivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.cĭrivers/net/ethernet/intel/igb/igb_main.cĭrivers/net/ethernet/intel/i40e/i40e_txrx.cĭrivers/net/ethernet/intel/ixgbe/ixgbe_main.cĭrivers/net/ethernet/intel/fm10k/fm10k_main.cĭrivers/net/ethernet/intel/i40evf/i40e_txrx.cĭrivers/net/ethernet/mellanox/mlx4/en_tx.cĪnd in the following (most GigE and lower) drivers:ĭrivers/net/ethernet/intel/e1000/e1000_main.cĭrivers/net/ethernet/intel/e1000e/netdev.cĭrivers/net/ethernet/stmicro/stmmac/stmmac_main.cĭrivers/net/ethernet/hisilicon/hip04_eth.cĭrivers/net/ethernet/hisilicon/hix5hd2_gmac.c Which apply to many card models, and most are well tested. There are now over 24 BQL enabled Ethernet drivers in Linux 4.1, many of Have managed the rings in the most primitive possible way.įirst step in putting sanity back into Ethernet driver transmit ring This is often a large source of bufferbloat, as the drivers Range of a “packet” of 64 bytes to 64k bytes in modern systems with TSOĮnabled. The business of handling interrupts on a per packet basis when runningĪt high bandwidths with small packets. Transmit and receive rings are now ubiquitous, to get the CPU’s out of More sanely use these offloads post Linux 3.13 with the sch_fq and

#HTB QUANTUM CALCULATOR MODS#

There have been mods to TCP’s behavior to make it less bursty and to Offloads like TSO/GSO/GRO/LFO is a good start. If you are trying to emulate a router’s behavior, turning off Sprouted various “offload” engines, unfortunately now often enabled byĭefault, which tend to do more damage than good except for extremeīenchmarking fanatics, often primarily on big server machines in dataĬenters. Network hardware (even in cheap hardware!) has grown “smart”, with Your data will be garbage if you don’t avoid them! Hardware/Software Traps for the Unwary This pageĪttempts to identify the most common omissions and mistakes. Results from other experimenters, due to a variety of factors. The bufferbloat project has had trouble getting consistent repeatable Work on Making codel and fq_codel Implementations Better Continuesīest Practices for Benchmarking CoDel and FQ CoDel (and almost any other network subsystem!).When not in control of the bottleneck link:.Tuning CoDel for Circumstances it Wasn’t Designed for.The NetEm qdisc does not work in conjunction with other qdiscs.Kernel Versions and Configuration is Important.Ethernet BQL (Byte Queue Limits) Driver Enablement.Best Practices for Benchmarking CoDel and FQ CoDel (and almost any other network subsystem!).