From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugme-daemon@bugzilla.kernel.org
Subject: [Bug 11635] strange message in dmesg for IDE HDD: cannot use LBA48 DMA - PIO mode will be used for accessing sectors > 268435456
Date: Wed, 24 Sep 2008 03:18:07 -0700 (PDT)
Message-ID: <20080924101807.9B313108056@picon.linux-foundation.org>
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http://bugzilla.kernel.org/show_bug.cgi?id=11635
------- Comment #1 from sshtylyov@ru.mvista.com 2008-09-24 03:18 -------
(In reply to comment #0)
> hdc: cannot use LBA48 DMA - PIO mode will be used for accessing sectors >
> 268435456
The IDE core honestly warns you that the controller doesn't support DMA for
accesses abobe 137 GB. Where's the problem?
> hdc: 488397168 sectors (250059 MB) w/8192KiB Cache, CHS=30401/255/63
> hdparm output:
> hdparm -Tt /dev/hdc output:
> /dev/hdc:
> Timing cached reads: 388 MB in 2.01 seconds = 193.07 MB/sec
> Timing buffered disk reads: 142 MB in 3.03 seconds = 46.89 MB/sec
> (I want to get something above 500MB/sec)
500 MB/s on disk reads?! That's totally wrong expectaion. What I am seeing
seems quite adequate speed for UltraDMA. And cached reads don't measure disk
transfer speed but rather your CPU bus/memory bandwidth.
> May it help (googled)
> i found that related info:
> https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.20/+bug/119730
> http://osdir.com/ml/ide/2005-03/msg00064.html
The latter reports DMA timeouts -- now that's an error indeed. But the report
is against 2.6.11. :-)
I suggest this to be resolved INVALID.
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