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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