Satoru Takeuchi satoru-takeuchi

## kernelvm探検隊online part2アンケートコメント
皆さんスゲー

非常に面白く参考になりました。

おもしろかったです

元気いただきました！

yasssss

## sched.go
package main

import (
	"fmt"
	"log"
	"os"
	"strconv"
	"sync"
	"time"
)

## sched.c
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <err.h>

#define NLOOP_FOR_ESTIMATION 1000000000UL

## rook_and_cephadm_performance_comparison.md

      
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                / rook_and_cephadm_performance_comparison.md
            
            
              Last active Jan 26, 2021
            
              
                rook and cephadm performance comparison
              
          
      View rook_and_cephadm_performance_comparison.md
  
      
    What is measured
The elapsed time to create 1 MON, 1 MGR, and 1 OSD Ceph cluster in one node.
All container is in local host.
result

rook

launching a one node k8s cluster by kubeadm: 84s
launching a rook/ceph cluster on top of this k8s cluster: 64s


## workaround-for-Ryzen-random-SEGV-problem
Subject: [RFC] [PATCH] workaround for Ryzen random SEGV problem

Limit the range of the virtual address map for user process, from 47 bit (128TB)
to 46 bit (64TB). It prevent processes to high memory address which would
cause random semgentation fault and some other problems on Ryzen.

For more detaul, please see the following links for detail.

The discussions about this problem on AMD support community.
https://community.amd.com/thread/215773

## freq
#!/bin/bash

for ((i=0;1;i++)) ; do
    for ((i=0;i<16;i++)) ; do
        cat /sys/devices/system/cpu/cpu$i/cpufreq/cpuinfo_cur_freq
        cat /sys/devices/system/cpu/cpu$i/cpufreq/scaling_cur_freq
        echo
    done
    echo "======"
    sleep 1

## cpusoc.freq.txt
2200000
2200000

2200000
2200000

2200000
2200000

2200000

## nocpunosoc.freq
2200000
2200000

2200000
2200000

2200000
2200000

2200000

## ryzen-random-corrected-mce-about-uop-cache
...
[  627.958024] mce: [Hardware Error]: Machine check events logged
[  627.958027] [Hardware Error]: Corrected error, no action required.
[  627.958034] [Hardware Error]: CPU:13 (17:1:1) MC3_STATUS[-|CE|MiscV|-|-|-|-|SyndV|-]: 0x9820000000000150
[  627.958037] [Hardware Error]: IPID: 0x000300b000000000, Syndrome: 0x000000002a000503
[  627.958040] [Hardware Error]: Decode Unit Extended Error Code: 0
[  627.958041] [Hardware Error]: Decode Unit Error: uop cache tag parity error.
[  627.958044] [Hardware Error]: cache level: RESV, tx: INSN, mem-tx: IRD
[ 1250.624254] mce: [Hardware Error]: Machine check events logged
[ 1250.624258] [Hardware Error]: Corrected error, no action required.

## ryzen-problem-repro3
#!/bin/bash

export LANG=C

if [ $# -ge 1 ] ; then
  CONCURRENCY=$1
else
  CONCURRENCY=16
fi
	皆さんスゲー

	非常に面白く参考になりました。

	おもしろかったです

	元気いただきました！

	yasssss
	#include <sys/types.h>
	#include <sys/wait.h>
	#include <time.h>
	#include <unistd.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <err.h>

	#define NLOOP_FOR_ESTIMATION 1000000000UL
	Subject: [RFC] [PATCH] workaround for Ryzen random SEGV problem

	Limit the range of the virtual address map for user process, from 47 bit (128TB)
	to 46 bit (64TB). It prevent processes to high memory address which would
	cause random semgentation fault and some other problems on Ryzen.

	For more detaul, please see the following links for detail.

	The discussions about this problem on AMD support community.
	https://community.amd.com/thread/215773
	#!/bin/bash

	for ((i=0;1;i++)) ; do
	for ((i=0;i<16;i++)) ; do
	cat /sys/devices/system/cpu/cpu$i/cpufreq/cpuinfo_cur_freq
	cat /sys/devices/system/cpu/cpu$i/cpufreq/scaling_cur_freq
	echo
	done
	echo "======"
	sleep 1
	...
	[ 627.958024] mce: [Hardware Error]: Machine check events logged
	[ 627.958027] [Hardware Error]: Corrected error, no action required.
	[ 627.958034] [Hardware Error]: CPU:13 (17:1:1) MC3_STATUS[-\|CE\|MiscV\|-\|-\|-\|-\|SyndV\|-]: 0x9820000000000150
	[ 627.958037] [Hardware Error]: IPID: 0x000300b000000000, Syndrome: 0x000000002a000503
	[ 627.958040] [Hardware Error]: Decode Unit Extended Error Code: 0
	[ 627.958041] [Hardware Error]: Decode Unit Error: uop cache tag parity error.
	[ 627.958044] [Hardware Error]: cache level: RESV, tx: INSN, mem-tx: IRD
	[ 1250.624254] mce: [Hardware Error]: Machine check events logged
	[ 1250.624258] [Hardware Error]: Corrected error, no action required.
	#!/bin/bash

	export LANG=C

	if [ $# -ge 1 ] ; then
	CONCURRENCY=$1
	else
	CONCURRENCY=16
	fi