[Letux-kernel] The new SMP driver and the new cache driver.

[dave]

Is there a typo in the OMAP5 result? Or is it really that good :) ?
-------- Original message --------From: "H. Nikolaus Schaller" <hns at goldelico.com> Date: 16/01/2021  17:53  (GMT+00:00) To: Zhou Yanjie <zhouyanjie at wanyeetech.com> Cc: mips-creator-ci20-dev at googlegroups.com, Discussions about the Letux Kernel <letux-kernel at openphoenux.org>, Paul Boddie <paul at boddie.org.uk>, Riccardo Mottola <riccardo.mottola at libero.it>, Ezequiel Garcia <ezequiel at vanguardiasur.com.ar> Subject: Re: [Letux-kernel] The new SMP driver and the new cache driver. Hi,> Am 16.01.2021 um 07:55 schrieb H. Nikolaus Schaller <hns at goldelico.com>:> > This one booted without segfaults with the same rootfs as before. At least I haven't seen such.I have rebuilt my tree and reinstalled and have not yet seen a segfault or hang as before.No idea what went wrong. Could have been fetching/using the wrong defconfig. I have committedthe letux_defconfig and there is now a new branch "letux-5.10.7+jz4780-smp" [1] which appearsto work for me.sysbench --cpu --num-threads=4 reports execution time (seconds) for some devices:CI20 single threaded	139.4188CI20:			69.5500Udoo Neo (i.MX6):	287.8606	[single core Cortex A8] RasPi 3B+:		103.3249	[dual core CI20 is faster than quad-core A53 with 1.4 GHz (in 32 bit mode)]PocketBeagle (AM3358):	359.8562	[single core Cortex A8]Pyra (OMAP5):		9.9983		[dual Cortex A15 with 1.5GHz]Pinephone:		52.9954		[quad core Cortex A53 (in 32 bit mode)]That shows that the "old" jz4780 isn't that bad in performance if we have SMP enabled.And compared to the OMAP5 it stays quite cool (<40°C).Next step is to try to integrate SMP with the CI20-HDMI stuff. Then we may get a first"longterm stable kernel" SMP solution, even if the patches need some polishing forupstreaming.BR and thanks for all the hard work on SMP,Nikolaus[1] https://git.goldelico.com/?p=letux-kernel.git;a=shortlog;h=refs/heads/letux-5.10.7%2Bjz4780-smpAttached is some system info:root at letux:~# cat /proc/cpuinfo system type             : JZ4780machine                 : img,ci20processor               : 0cpu model               : Ingenic XBurst V4.15  FPU V0.0BogoMIPS                : 1196.85wait instruction        : yesmicrosecond timers      : notlb_entries             : 32extra interrupt vector  : yeshardware watchpoint     : yes, count: 1, address/irw mask: [0x0fff]isa                     : mips1 mips2 mips32r1 mips32r2ASEs implemented        :shadow register sets    : 1kscratch registers      : 0package                 : 0core                    : 0VCED exceptions         : not availableVCEI exceptions         : not availableprocessor               : 1cpu model               : Ingenic XBurst V4.15  FPU V0.0BogoMIPS                : 1202.58wait instruction        : yesmicrosecond timers      : notlb_entries             : 32extra interrupt vector  : yeshardware watchpoint     : yes, count: 1, address/irw mask: [0x0fff]isa                     : mips1 mips2 mips32r1 mips32r2ASEs implemented        :shadow register sets    : 1kscratch registers      : 0package                 : 0core                    : 1VCED exceptions         : not availableVCEI exceptions         : not availableroot at letux:~# uname -aLinux letux 5.10.7-letux-ci20+ #4688 SMP PREEMPT Sat Jan 16 16:14:24 CET 2021 mips GNU/Linuxroot at letux:~# cat </dev/tcp/time.nist.gov/13 && sysbench --test=cpu run && cat </dev/tcp/time.nist.gov/1359230 21-01-16 16:48:00 00 0 0 651.3 UTC(NIST) * sysbench 0.4.12:  multi-threaded system evaluation benchmarkRunning the test with following options:Number of threads: 1Doing CPU performance benchmarkThreads started!Done.Maximum prime number checked in CPU test: 10000Test execution summary:    total time:                          139.4414s    total number of events:              10000    total time taken by event execution: 139.4188    per-request statistics:         min:                                 13.90ms         avg:                                 13.94ms         max:                                 14.46ms         approx.  95 percentile:              13.98msThreads fairness:    events (avg/stddev):           10000.0000/0.00    execution time (avg/stddev):   139.4188/0.0059230 21-01-16 16:50:20 00 0 0 943.6 UTC(NIST) * root at letux:~# _______________________________________________https://projects.goldelico.com/p/gta04-kernel/Letux-kernel mailing listLetux-kernel at openphoenux.orghttp://lists.goldelico.com/mailman/listinfo.cgi/letux-kernel
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