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SubjectRe: [patch 2.6.22-rc6] ATA: add a PCI ID for Intel Santa Rosa PATA controller
Date
On Friday, 6. July 2007, Gaston, Jason D wrote:
> >> > On the other hand, we can leave it, because of a
> >"off-by-one error" in ata_piix.c,
> >> > do_pata_set_dmamode, line ~770:
> >> > [...]
> >>
> >
> >Thanks,
> > Chr.
> >
> >
>
> I quickly tried this patch on an ICH7-R system with an ATA133 Maxtor HD
> and it did not seem to do anything bad. I see no difference in function
> or performance with the patch.
>
> Jason
>

Thanks for testing, but you forgot some numbers. ;)
(bonnie++? hdparm -i && hdparm -t...)

Because, I don't think that Maxtor HD's mechanics is faster than 100MB/s..
The only thing that can keep up with > 100MB/s are the few MB of Cache on every HDD...
(so, does anyone have a good idea to check the HDD's cache performance?
hdparm -t reads too much data)
I came up with something like:
"dd if=/dev/sdX of=/dev/null bs=4M count=1 iflag=direct"

and run it 10 times in a row.

here's a test run with a SATA I WD2500YD-01N ( hdparm -t performance: ~57MB/s)
4194304 bytes (4.2 MB) copied, 0.0897687 seconds, 46.7 MB/s
4194304 bytes (4.2 MB) copied, 0.0776731 seconds, 54.0 MB/s
4194304 bytes (4.2 MB) copied, 0.0711224 seconds, 59.0 MB/s
4194304 bytes (4.2 MB) copied, 0.0679675 seconds, 61.7 MB/s
4194304 bytes (4.2 MB) copied, 0.0603272 seconds, 69.5 MB/s
4194304 bytes (4.2 MB) copied, 0.0543068 seconds, 77.2 MB/s
4194304 bytes (4.2 MB) copied, 0.0522881 seconds, 80.2 MB/s
4194304 bytes (4.2 MB) copied, 0.0520612 seconds, 80.6 MB/s
4194304 bytes (4.2 MB) copied, 0.0444805 seconds, 94.3 MB/s
4194304 bytes (4.2 MB) copied, 0.0338407 seconds, 124 MB/s
4194304 bytes (4.2 MB) copied, 0.0333174 seconds, 126 MB/s

Thanks,
Chr
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