Public bug reported:
Hello.
We're experiencing an issue with performance of the 2nd harddrive (/dev/sdb)
when running Ubuntu kernels.
The system has the following 2 UATA harddrives:
/dev/sda:
Model=WDC WD1200JB-75EVA0, FwRev=15.05R15, SerialNo=WD-WMAEL1235051
Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq }
RawCHS=16383/16/63, TrkSize=57600, SectSize=600, ECCbytes=74
BuffType=DualPortCache, BuffSize=8192kB, MaxMultSect=16, MultSect=8
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=234375000
IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
AdvancedPM=no WriteCache=enabled
Drive conforms to: Unspecified: ATA/ATAPI-1,2,3,4,5,6
/dev/sdb:
Model=ST3160812A, FwRev=3.ADH, SerialNo=5LSCYD99
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
BuffType=unknown, BuffSize=8192kB, MaxMultSect=16, MultSect=8
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=312500000
IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
AdvancedPM=no WriteCache=enabled
Drive conforms to: Unspecified: ATA/ATAPI-1,2,3,4,5,6,7
The speed measurement with hdparm -Tt results in these values:
/dev/sda:
Timing cached reads: 932 MB in 2.00 seconds = 465.53 MB/sec
Timing buffered disk reads: 168 MB in 3.01 seconds = 55.73 MB/sec
/dev/sdb:
Timing cached reads: 638 MB in 2.00 seconds = 318.51 MB/sec
Timing buffered disk reads: 12 MB in 3.56 seconds = 3.37 MB/sec
I've tested the same with kernel taken from Mageia 2.
The second drive returned over 400MB/sec for the cached reads
and 75MB/s for buffered disk reads.
I tested the following two Ubuntu kernels and the issue is reproducible with
both of them:
3.5.0-17-generic
3.5.0-28-generic
lspci -nn says:
00:0f.1 IDE interface [0101]: Broadcom CSB6 RAID/IDE Controller [1166:0213]
(rev a0)
/dev/sda is sharing the primary UATA cable with DVD burner.
/dev/sdb is single on the secondary UATA cable.
I'm willing to provide you with any additional debug info.
Please, let me know.
Thanks and regards,
Jaromir.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1176993
Title:
Very poor performance of the 2nd UATA harddrive (works well with
Mageia2 kernel)
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