Brakes at work with SSD


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Is the eee pc 900 with a low write speed on SSD disk. From time to time, apparently, there is a reset of caches to disk, and it's time to crash all applications that are trying to work with the disk. Large enough, sometimes up to 30-40 seconds. OS is Archlinux. What can you tweak the kernel somehow remove these brakes?

If it matters, the file system ext2 runs on top of lvm.
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7 Answers

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go to ext4
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Try additionally use noatime in fstab settings.
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I had the same with debian ext2 — worked without problems. Can try file system to change?
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try the noop scheduler I / o:
\r
echo noop > /sys/block/sda/queue/scheduler
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There are a couple of ideas:
1. the scheduler is not a noop, and deadline
\recho deadline > /sys/block/sda/queue/scheduler
and there is the option:
\recho 1 > /sys/block/sda/queue/iosched/fifo_batch
\r
2. Speed up Firefox cache
Create a tmpfs in fstab:
\rtmpfs /tmp tmpfs defaults,noatime,mode=1777 0 0
Transfer to the cache of FF: about:config browser offered.cache.disk.parent_directory = /tmp
\r
Needs a little help.
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The move from sysctl:
\r
kernel.io_delay_type
kernel.blk_iopoll
vm.dirty_background_ratio = 10
vm.dirty_background_bytes = 0
vm.dirty_ratio = 20
vm.dirty_bytes = 0
vm.dirty_writeback_centisecs = 500
vm.dirty_expire_centisecs = 3000
\r
These are things with which to play. For example, to make since often.
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There is an informative article about NAND SSD www.easycom.com.ua/prtart.php?id=1136&lang=ru
Thoughts from there:
The more filled in the disk, the longer it takes to sweep blocks of flash (exponential dependence).
Algorithms oriented on work with hard disk (such as caching and defragmentation), usually degrade the SSD performance.
According to research by IBM for ideal operating conditions of the SSD when it is filled less than 75% and the ratio of static (static, i.e., rarely moved, and mostly just read) and dynamic pieces of information 3 to 1.
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