linux-kernel - Re: [patch 2.6.22-rc6] ATA: add a PCI ID for Intel Santa Rosa PATA controller

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Date:	Fri, 6 Jul 2007 21:45:01 +0200
From:	Chr <chunkeey@....de>
To:	"Gaston, Jason D" <jason.d.gaston@...el.com>
Cc:	"Thorsten Leemhuis" <thl@...heise.de>,
	"Thorsten Leemhuis" <fedora@...mhuis.info>,
	"Chuck Ebbert" <cebbert@...hat.com>,
	"Jeff Garzik" <jeff@...zik.org>,
	"IDE/ATA development list" <linux-ide@...r.kernel.org>,
	"Alan Cox" <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: [patch 2.6.22-rc6] ATA: add a PCI ID for Intel Santa Rosa PATA controller

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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