Difference between revisions of "Linux Tuning"
From ElphelWiki
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# echo 1500000 > /proc/sys/net/core/rmem_max | # echo 1500000 > /proc/sys/net/core/rmem_max | ||
# echo 1500000 > /proc/sys/net/core/rmem_default | # echo 1500000 > /proc/sys/net/core/rmem_default | ||
| + | ==Virtual memory subsystem tuning== | ||
| + | ===For Linux version 2.4.=== | ||
| + | # echo 30 10 0 0 4 3000 70 0 0 > /proc/sys/vm/bdflush | ||
| + | ===For Linux version 2.6.=== | ||
| + | # echo 5 > /proc/sys/vm/dirty_background_ratio | ||
| + | # echo 70 > /proc/sys/vm/dirty_ratio | ||
| + | # echo 4 > /proc/sys/vm/dirty_writeback_centisecs | ||
| + | # echo 3000 > /proc/sys/vm/dirty_expire_centisecs | ||
==Links== | ==Links== | ||
Latest revision as of 09:56, 2 January 2006
Data about kernel tuning will be collected here.
Contents
Network tuning
To allow receive of multicast packets it is necessary to set route rules for multicast:
# route add -net 224.0.0.0 netmask 240.0.0.0 dev eth0
To avoid packet lossing it is necessary to increase a size of socket receive buffer to 1500000 bytes (tested with ElphelOgm on Intel(R) Pentium(R) 4 CPU 3.20GHz with 100Mbit ethernet card and multicast flow from the camera about 6MB/s).
# echo 1500000 > /proc/sys/net/core/rmem_max # echo 1500000 > /proc/sys/net/core/rmem_default
Virtual memory subsystem tuning
For Linux version 2.4.
# echo 30 10 0 0 4 3000 70 0 0 > /proc/sys/vm/bdflush
For Linux version 2.6.
# echo 5 > /proc/sys/vm/dirty_background_ratio # echo 70 > /proc/sys/vm/dirty_ratio # echo 4 > /proc/sys/vm/dirty_writeback_centisecs # echo 3000 > /proc/sys/vm/dirty_expire_centisecs
Links
Old discussions on SourceForge
Linux Tuning Guide (for 2.4 kernels)
Red Hat Enterprise Linux 4: Reference Guide: Directories within /proc/
