dirty_expire_seconds & dirty_writeback_centisecs:默认都是1/100(即时间间隔为每秒100次),根据dirty_write_centisecs的配置周期性的唤醒pdflush,pdflush会检查脏页的存活时间是否超过dirty_expire_seconds,如果超过则刷盘; dirty_background_ratio Contains, as a percentage of total available memory that contains fr...
vm.dirty_background_bytes = 0 vm.dirty_background_ratio = 10 vm.dirty_bytes = 0 vm.dirty_ratio = 20 vm.dirty_writeback_centisecs = 500 vm.dirty_expire_centisecs = 3000 vm.dirtytime_expire_seconds = 43200 1. 2. 3. 4. 5. 6. 7. 8. vm.dirty_background_ratio是内存可以填充脏数据...
vm.dirtytime_expire_seconds=43200这个主要是给 lazytime inode 设置的过期时间,比如 inode 只是更新了 atime,这种更新非常频繁的数据就没必要短时间就更新,而且负责刷盘的是另外一个专门的 dirtytime writeback 进程,因此这个的默认时间比较长:12小时,这个就不建议调整了,作用不大 vm.page-cluster=3vm.swappiness=...
vm.dirtytime_expire_seconds = 43200 或者 # sysctl -a | grep dirty sysctl: reading key "net.ipv6.conf.all.stable_secret" sysctl: reading key "net.ipv6.conf.default.stable_secret" sysctl: reading key "net.ipv6.conf.eth0.stable_secret" sysctl: reading key "net.ipv6.conf.eth1.stable_...
ehigh@master-1:~$ cat /proc/sys/vm/dirty_expire_centisecs 3000 # 脏数据的写入间隔时间,单位为1/100秒 ehigh@master-1:~$ cat /proc/sys/vm/dirty_writeback_centisecs 500 1. 2. 3. 4. 5. 6. 7. 脏数据手动回收: 使用sync命令将内存中的所有脏数据写回磁盘,以减少数据丢失或损坏的风险。
vm.dirty_writeback_centisecs = 500 vm.dirtytime_expire_seconds = 43200 sysctl关于vm相关参数的含义可以查看https://www.kernel.org/doc/Documentation/sysctl/vm.txt 这几个参数可以通过sysctl直接读取,也可以通过cat /proc/sys/vm/dirty*进行读取。这几个参数分别表示: ...
dirty_background_bytes ├── dirty_background_ratio ├── dirty_bytes ├── dirty_expire_centisecs ├── dirty_ratio ├── dirty_writeback_centisecs ├── dirtytime_expire_seconds ├── drop_caches ├── extra_free_kbytes ├── laptop_mode ├── legacy_va_layout ├── lowmem...
[main]summary=Optimize for Microsoft SQL Serverinclude=throughput-performance[cpu]force_latency=5[sysctl]vm.swappiness=1vm.dirty_background_ratio=3vm.dirty_ratio=80vm.dirty_expire_centisecs=500vm.dirty_writeback_centisecs=100vm.transparent_hugepages=always# ...
This kernel parameters measures in 100th's of a second. vm.dirty_expire_centisecs Defines the time of dirty data that becomes old to be written to hard-disk. This kernel parameters measures in 100th's of a second. Additional resources 73 Red Hat Ente...
通过读取代码,发现ubifs_bgt0_0会创建一个hrtimer,其timeout设置为dirty_writeback_interval,看着很眼熟!通过进一步搜索,发现Linux中有它的定义,如下: /* * The interval between `kupdate'-style writebacks */ unsigned int dirty_writeback_interval = 5 * 100; /* centiseconds */ WOW,500cetiseconds,就...