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Re: System Performances

gustavo halperin wrote:
Hello I have some questions about system performances.

By now I have the current 'hdparm' settings: -m16 -c3 -u1 -Xudma5
Then the  'hdparm -Tt /dev/hda' show the next results:
   Timing cached reads:   1376 MB in  2.00 seconds = 686.58 MB/sec
   Timing buffered disk reads:   50 MB in  3.02 seconds =  16.53 MB/sec
But if the configuration is '-m0 -c0 -u0 ' the result from 'hdparm -Tt' is the same, so there are any way to improve this Timings ??

Second If I set with 'hdparm' the settings '-S 12' and '-y' always after few minutes the drive state back to 'active/idle', that is OK.

Last, the configurations of the "performance-settings Linux VM" (/proc/sys/vm/<files>) and the "system wide limit for file handles" (/proc/sys/fs/file_max) can improve system behave ? How can I know what are the best configurations ??

Thank you,

Did u open DMA? I get

Timing cached reads:   440 MB in  2.01 seconds = 219.40 MB/sec
Timing buffered disk reads:   82 MB in  3.05 seconds =  26.89 MB/sec
in my old disk. My momery is jsut 256M so cached read looks bad. But buffered read is OK. & this is my param.
hdparm -v /dev/hdb

multcount    = 16 (on)
IO_support   =  1 (32-bit)
unmaskirq    =  0 (off)
using_dma    =  1 (on)
keepsettings =  0 (off)
readonly     =  0 (off)
readahead    = 256 (on)
geometry     = 65535/16/63, sectors = 78165360, start = 0

BTW, check u cable is really UATA100 or later, do not just connect by a CDROM cable which just can provide 33M/s as max.


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