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[Launchpad Bug Tracker <1176993@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1176993

Title:
  Very poor performance of the 2nd UATA harddrive (works well with
  Mageia2 kernel)

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  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.

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