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AdviceIOPerfomance
some advice: we can modify some Linux system params to improve the device I/O perfomance. for example: /proc/sys/vm/dirty_writeback_centisecs echo "100" > /proc/sys/vm/dirty_writeback_centisecs /proc/sys/vm/dirty_ratio echo '10' > /proc/sys/vm/dirty_ratio /proc/sys/vm/dirty_background_ratio echo '5' > /proc/sys/vm/dirty_background_ratio |
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also,you can see http://www.linuxsp.com/read.php?wid=10
Not Found The requested URL /read.php was not found on this server. :-(
powertop, the laptop tool, recommends 1500 for this:
Also, in most distros, you can set these values in /etc/sysctl.conf
powertop recommendations is for least power consumption, not best performance.
For good smooth performance you want writebacks to be running quite frequently, pushing out the writes in small chunks, not large batches which suddenly hog the device for considerable time.
Laptop requirements is the exact opposite.. here you want writes to be written out in as large batches as feasible to save power at the expense of some uneven latency.