Enable DMA by default (Also a kernel option, and I think this can be done by hdparm also) Using this I get 25MB/sec plus with my UDMA-66 drive.
Hi Charles,
Your response prompts me to ask whether you know what sort of transfer rate I should see. I have a correctly cabled IBM Deskstar ATA 100 (DTLA 307030) running under 7.0 and my home-compiled 2.4 kernel on an 815e mobo (Asus cusl2). So far as I can tell I have set everything correctly in the kernel, including dma. Hdparm reports UDMA mode 5 in use. When I run hdparm -tT, however, I see :
/dev/hda: Timing buffer-cache reads: 128 MB in 1.03 seconds =124.27 MB/sec Timing buffered disk reads: 64 MB in 4.13 seconds = 15.50 MB/sec
I know that hdparm is a crude tool for benchmarking a hard drive, and that one never gets the "full" transfer rate in the real world, but 15.50 MB/sec, seems very slow.
I would be grateful for any observations / advice.
Regards,
Geoff
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