Thanks Oliver On Wed, 5 Sep 2001, Simon Oliver wrote:
For comparison:
bash-2.05# hdparm -tT /dev/hdd
/dev/hdd: Timing buffer-cache reads: 128 MB in 1.23 seconds =104.07 MB/sec Timing buffered disk reads: 64 MB in 2.26 seconds = 28.32 MB/sec
Much better numbers than what I am getting
bash-2.05# cat /proc/version Linux version 2.4.4-4GB (root@Pentium.suse.de) (gcc version 2.95.3 20010315 (SuSE)) #1 Sat Jun 23 05:26:59 GMT 2001
This is a PIII-600 with 80GB Maxtor 98196H8 IDE Hard Disks, running on SuSE Linux 7.2 with the default SuSE 2.4 kernel, with: hdparm -d1 -u0 -c0 -m16 /dev/hdd. I found that changing values other than DMA made very little difference to speed but turning off DMA made a significant difference:
I found the same thing
bash-2.05# hdparm -d0 /dev/hdd
/dev/hdd: setting using_dma to 0 (off) using_dma = 0 (off) bash-2.05# hdparm -tT /dev/hdd
/dev/hdd: Timing buffer-cache reads: 128 MB in 1.22 seconds =104.92 MB/sec Timing buffered disk reads: 64 MB in 19.84 seconds = 3.23 MB/sec
Be aware that the timings cary from run to run - you might want to take an average of 5 tests.
That's how I have been doing it. Thanks Dan Greenberg Ann Arbor, MI
-- Simon Oliver
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