hdparm decreases performance
I ran hdparm -tT /dev/hda on my system with the following results:
Timing buffer-cache reads: 128 mb 0.89 sec = 143.82 mb/sec Timing buffered disk reads: 64 mb 1.69 sec = 37.87 mb/sec After reading a couple post and the man pages I tried the following: hdparm -X34 -d1 -u1 -m16 -c3 /dev/hda After running hdparm -tT /dev/hda again I now I get the following: Timing buffer-cache reads: 128 mb 0.97 sec = 131.96 mb/sec Timing buffered disk reads: 64 mb 5.30 sec = 12.08 mb/sec I'm new to the Linux world but this does not seem like an improvement to me. Am I missing something or did I do something wrong? Thanks in advance for the help. buddhahat P.S. - I'm running RH 9. |
turning dma on (d1) is typically a big improvement if it was previously off.
did you check to see if it was off first ? I reckon the other switches are going to be minor speed improvements in comparison, which would reflect what you're seeing. |
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