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too big readahead can be bad
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@8497 b3059339-0415-0410-9bf9-f77b7e298cf2
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<P> <CODE>echo file_readahead:2000000 > /proc/ide/[cdrom device]/settings</CODE></P>
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<P>This sets prefetched file reading to 2MB, which helps with scratched CD-ROMs.
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If you set it to too high, the drive will continuously spin up and down, and
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will dramatically decrease the performance.
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It is recommended that you also tune your CD-ROM drive with hdparm:</P>
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<P> <CODE>hdparm -d1 -a8 -u1 (cdrom device)</CODE></P>
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