On Fri, 16 Mar 2001, William Park wrote:
> I'm running 2.2.18 on VIA686B (ABit VP6). Some time ago, you mentioned
> that you got ~80Mb/s from 'hdparm -t /dev/hda'. Please tell us how?
> Which hdparm/kernel options did you enable?
Nope not w/ 'hdparm' with DiskPerf and correcting for CR3's on memcpy's.
[root@via DiskPerf-1.0.3]# ./DiskPerf /dev/hda
Device: IBM-DTLA-307030 Serial Number: YKDYKM37674
LBA 0 DMA Read Test = 56.62 MB/Sec (4.42 Seconds)
Outer Diameter Sequential DMA Read Test = 35.46 MB/Sec (7.05 Seconds)
Inner Diameter Sequential DMA Read Test = 17.72 MB/Sec (14.10 Seconds)
When you adjust for memory delays (of 35-40%) then you get those number.
and those numbers are valid inside for kernel-kernel access, not
kernel-user-space.
Cheers,
Andre Hedrick
Linux ATA Development
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This archive was generated by hypermail 2b29 : Fri Mar 23 2001 - 21:00:14 EST