New: strange message in dmesg for IDE HDD: cannot use LBA48 DMA - PIO mode will be used for accessing sectors > 268435456
http://bugzilla.kernel.org/show_bug.cgi?id=11635
Summary: strange message in dmesg for IDE HDD: cannot use LBA48
DMA - PIO mode will be used for accessing sectors >
268435456
Product: IO/Storage
Version: 2.5
KernelVersion: 2.6.26.1
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: IDE
AssignedTo: [email protected]
ReportedBy: [email protected]Latest working kernel version: unknown
Earliest failing kernel version: detected on kernel-2.6.25
Distribution: gentoo
Hardware Environment: Asus A7A266 motherboard with BIOS upgraded to latest release (no beta version of upgrade) lspci output:
00:00.0 Host bridge: ALi Corporation M1647 Northbridge [MAGiK 1 / MobileMAGiK 1] (rev 04)
00:01.0 PCI bridge: ALi Corporation PCI to AGP Controller
00:02.0 USB Controller: ALi Corporation USB 1.1 Controller (rev 03) 00:04.0 IDE interface: ALi Corporation M5229 IDE (rev c4)
00:05.0 Multimedia audio controller: C-Media Electronics Inc CM8738 (rev 10) 00:06.0 USB Controller: ALi Corporation USB 1.1 Controller (rev 03) 00:07.0 ISA bridge: ALi Corporation M1533/M1535 PCI to ISA Bridge [Aladdin IV/V/V+]
00:0a.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)
00:0c.0 Serial controller: Rockwell International HCF 56k Data/Fax Modem (rev
01)
00:11.0 Bridge: ALi Corporation M7101 Power Management Controller [PMU] 01:00.0 VGA compatible controller: nVidia Corporation NV4 [RIVA TNT] (rev 04)
Software Environment: Gentoo Linux.
Problem Description: Hdd is slow and dmesg show a strange message
Steps to reproduce:compile kernel and boot
Output of script/ver_linux
If some fields are empty or look unusual you may have an old version. Compare to the current minimal requirements in Documentation/Changes.
Linux AServer 2.6.26.1 #1 Wed Sep 24 00:18:06 CEST 2008 i686 AMD Athlon(TM) XP1600+ AuthenticAMD GNU/Linux
Gnu C 4.1.2 Gnu make 3.81 binutils 2.18 util-linux 2.13.1.1 mount 2.13.1.1 module-init-tools 3.4 e2fsprogs 1.40.9 reiserfsprogs 3.6.19 Linux C Library 2.6.1 Dynamic linker (ldd) 2.6.1 Procps 3.2.7 Net-tools 1.60 Kbd 1.13 Sh-utils 6.9 udev 124 Modules Loaded ipt_REJECT ipt_LOG ipt_addrtype xt_pkttype xt_multiport
xt_MARK xt_mac xt_iprange xt_tcpudp xt_state nf_conntrack_ipv4 nf_conntrack iptable_mangle nfnetlink iptable_filter ip_tables x_tables ohci_hcd usbcore i2c_ali1535
dmesg output:
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
hda: max request size: 128KiB
hda: cannot use LBA48 DMA - PIO mode will be used for accessing sectors > 268435456
hda: 488397168 sectors (250059 MB) w/8192KiB Cache, CHS=30401/255/63
hda: cache flushes supported
hda: hda1 hda2 hda3 hda4
hdc: max request size: 128KiB
hdc: cannot use LBA48 DMA - PIO mode will be used for accessing sectors > 268435456
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)
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
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[Bug 11635] strange message in dmesg for IDE HDD: cannot use LBA48 DMA - PIO mode will be used for accessing sectors > 268435456
http://bugzilla.kernel.org/show_bug.cgi?id=11635
------- Comment #1 from [email protected] 2008-09-24 03:18 ------- (In reply to comment #0)
Quoted 2 lines
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?
Quoted 8 lines
hdc: 488397168 sectors (250059 MB) w/8192KiB Cache, CHS=30401/255/63
hdparm output:
hdparm -Tt/dev/hdcoutput:/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.
Quoted 4 lines
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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[Bug 11635] strange message in dmesg for IDE HDD: cannot use LBA48 DMA - PIO mode will be used for accessing sectors > 268435456
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=11635
[email protected] changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |REJECTED
Resolution| |WILL_NOT_FIX------- Comment #2 from [email protected] 2008-09-24 03:27 ------- This is a hardware limit.
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[Bug 11635] strange message in dmesg for IDE HDD: cannot use LBA48 DMA - PIO mode will be used for accessing sectors > 268435456
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=11635
------- Comment #3 from [email protected] 2008-09-24 07:11 -------
Quoted 1 line
500 MB/s on disk reads?! That's totally wrong expectaion
For my personal computer (Pentium IV)
hdparm -Tt /dev/hda
/dev/hda:
Timing cached reads: 1500 MB in 2.00 seconds = 749.31 MB/sec
Timing buffered disk reads: 184 MB in 3.01 seconds = 61.14 MB/sec
Server I'm using its athlon 1800MHz and I got same performance as previous server I got (k6-II @ 450MHz) I found server slow in transfers and high CPU usage (and k6-II never warnning me for hardware limits :S) This is the reason I'm in doubt.
Upgrading server didn't increase transfers between my PC and my server, in my local network :(
Thanks for replies.
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[Bug 11635] strange message in dmesg for IDE HDD: cannot use LBA48 DMA - PIO mode will be used for accessing sectors > 268435456
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=11635
------- Comment #4 from [email protected] 2008-09-24 07:44 -------
Quoted 1 line
Timing buffered disk reads: 184 MB in 3.01 seconds = 61.14 MB/sec
is the disk speed
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