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| -rw-r--r-- | doc/README.freebsd | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/doc/README.freebsd b/doc/README.freebsd index eec8c5bac..72d5f2e65 100644 --- a/doc/README.freebsd +++ b/doc/README.freebsd @@ -10,6 +10,33 @@ kern.ipc.shmmax=67108864 kern.ipc.shmall=32768 +mtrr on freebsd +--------------- + +setting up the caching behaviour of the memory on the graphics board. + +what is being done with the mtrr support on linux is to set the caching +type of the memory of the graphics board to 'write-combine' mode. +that way the performance of big writes into this memory should be faster. + +it seems that the same can be achieved on freebsd by executing: + + memcontrol set -b <base-address> -l <length> write-combine + +for example on my system i executed: + + memcontrol set -n 0xd8000000 -l 0x02000000 write-combine + +i got the base-adress by executing 'startx' and looking at the output. + +it seems to be dangerous to change the cache setting of the graphics memory +while xfree is running - at least i managed to have my system freeze that +way. so better do it on the commandline. + +this tip is still subject of research, so it might be incorrect - please +report any further information on this topic to the xine-user list. +please also report success or non-success on xine-user if you have the time. + playing video cd on freebsd --------------------------- |