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Here is what I can acheive using an IBM DeskStar 75 Gig 7200 RPM UDMA
100 (controller only does UDMA 66) using linux-2.4.0-test10-pre3 and 3.6
drivers for my VIA vt82c596b (I believe they are not official yet but
were released as a test package by email around October 6th on this
email list), here is the output of hdparm -Tt /dev/hda on my machine:

4 root@ledzep /var/log > hdparm -Tt /dev/hda

Timing buffer-cache reads: 128 MB in 0.91 seconds =140.66 MB/sec
Timing buffered disk reads: 64 MB in 2.32 seconds = 27.59 MB/sec
5 root@ledzep /var/log >

Which blows away the U/W SCSI hard drive I had in my last machine!

Jordan Breeding

Michael Kwasigroch wrote:
> Hi,
> I recently bought a 40Gig IBM ATA100 disk as a replacement for a dying 4G
> SCSI disk. I knew I was risking some trouble because I have an about 4 year
> old triton 2 board (Intel 430HX) and I didn't want to risk more trouble
> (and spend more money) by using a proprietary PCI IDE controller board. But
> the disk was dead cheap and really big so I bought it and connected it as
> the primary master on the onboard controller and...
> Linux (stock 2.2.17) could ony push about 2.6 MB/s "through" it (hdparm -Tt
> /dev/hda)... :-(
> The scsi disks can do about 5.5 - 6.1 MB/s (8Bit fast SCSI, no ultra,
> adaptec 2940 PCI).
> So I tried to enable IDE DMA, 16 bit data transfers, no use. That was quite
> disappointing but I gave up until yesterday when I (again) searched
> I got the latest 2.2.17 ide-patch, made a new kernel and voila:
> My new IDE disk now "flies" at about 9.2 MB/s and really outperforms the
> scsi disks!!!
> ABOUT 3.5 PERFORMANCE GAIN! FOR FREE!!! Unbelievable, but the truth with
> free software...
> One thing I don't understand: Why is this patch not in the stock kernel? It
> should (positively) affect lots of people, or am I missing something?
> P.S.: Please email me directly, I'm not subscribed to any Linux list.
> PPS: Beware 33+ Gig IDE disks if you have an Award 4.51 BIOS and want to
> boot from it.
> You will **NOT** be able to boot from disks >33G due to a BIOS bug.
> See
> and
> for details.
> Enjoy.
> Mit freundlichen Gruessen / best regards
> Michael Kwasigroch
> FaxPlus/Open Development
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