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 ??
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.