Public bug reported:
Hi,
upgrading from Gutsy to Hardy I've seen a considerable HD transfer rate
slowdown.
I have a machine with two IDE disks, both are udma5 capable. In Gutsy,
they were recognised as 'hd[ab]' and I with hdparm sequential thoughput
was:
/dev/hdb:
Timing buffered disk reads: 172 MB in 3.01 seconds = 57.19 MB/sec
which is quite correct for that kind of drive.
In Hardy, they are recognized as 'sd[ab]', and the performance regarding
transfer rate is LESS THAN HALF:
/dev/sdb:
Timing buffered disk reads: 78 MB in 3.01 seconds = 25.92 MB/sec
That slowdown is visible also during file transfer operations,
obviously. One thing I've noticed is that in the dmesg, my drive is set
at UDMA/33, and also hdparm reports that udma2 is currently configured:
sudo hdparm -i /dev/sdb
/dev/sdb:
Model=WDC WD2500JB-00GVC0 , FwRev=08.02D08, SerialNo=
WD-WCAL78023606
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=?16?
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=488397168
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
* signifies the current active mode
I've seen a number of users complaining about that, a number of bugs
with status Incomplete or Release Fixed. I can say that with the latest
Hardy patches (as of now), the problem is still there. Will that be
fixed before the final release? If not, that can be a huge performance
penalty!
Here are some infos. I'm willing to help to solve the problem, just ask if you
need any info.
[EMAIL PROTECTED]:~$ lsb_release -rd
Description: Ubuntu hardy (development branch)
Release: 8.04
Pertinent dmesg output:
[ 35.085132] libata version 3.00 loaded.
[ 35.460830] pata_via 0000:00:11.1: version 0.3.3
[ 35.463781] scsi0 : pata_via
[ 35.465345] scsi1 : pata_via
[ 35.465441] ata1: PATA max UDMA/100 cmd 0x1f0 ctl 0x3f6 bmdma 0xcc00 irq 14
[ 35.465446] ata2: PATA max UDMA/100 cmd 0x170 ctl 0x376 bmdma 0xcc08 irq 15
[ 35.637026] ata1.00: ATA-6: Maxtor 5T030H3, TAH71DP0, max UDMA/100
[ 35.637034] ata1.00: 60030432 sectors, multi 16: LBA
[ 35.638417] ata1.01: ATA-6: WDC WD2500JB-00GVC0, 08.02D08, max UDMA/100
[ 35.638424] ata1.01: 488397168 sectors, multi 16: LBA48
[ 35.638446] ata1.00: limited to UDMA/33 due to 40-wire cable
[ 35.638450] ata1.01: limited to UDMA/33 due to 40-wire cable
[ 35.652916] ata1.00: configured for UDMA/33
[ 35.669962] ata1.01: configured for UDMA/33
[ 36.136471] ata2.00: ATAPI: LG DVD-ROM DRD-8160B, 1.01, max UDMA/33
[ 36.136502] ata2.01: ATAPI: HL-DT-ST GCE-8160B, 1.02, max MWDMA2
[ 36.300210] ata2.00: configured for UDMA/33
[ 36.464034] ata2.01: configured for MWDMA2
[ 36.464239] scsi 0:0:0:0: Direct-Access ATA Maxtor 5T030H3 TAH7
PQ: 0 ANSI: 5
[ 36.464959] scsi 0:0:1:0: Direct-Access ATA WDC WD2500JB-00G 08.0
PQ: 0 ANSI: 5
Kernel:
Linux ste-ubuntu 2.6.24-16-generic #1 SMP Thu Apr 10 13:23:42 UTC 2008
i686 GNU/Linux
For other info, just let me know! BTW, congrats for the GREAT WORK!!!
** Affects: ubuntu
Importance: Undecided
Status: New
--
Slow disk transfer rate on Hardy
https://bugs.launchpad.net/bugs/216878
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