Comment 8 for bug 216878

Hi Teej,
    if you take a look at the bug report, you'll discover that this
but is STILL present in Intrepid.

There hasn't been any activity since nobody from the bug squad ever
replied to this bug, but I can confirm definitely that this is there.

Let me know what kind of info do you need to spot the problem.

2008/11/6 Teej <email address hidden>:
> Thank you for taking the time to report this bug and helping to make
> Ubuntu better. You reported this bug a while ago and there hasn't been
> any activity in it recently. We were wondering is this still an issue
> for you? Can you try with latest Ubuntu release? Thanks in advance.
>
> Note: Why was this never set to confirmed by anyone if so many users are
> experiencing this same problem?
>
> ** Changed in: ubuntu
> Status: New => Confirmed
>
> --
> Slow disk transfer rate on Hardy
> https://bugs.launchpad.net/bugs/216878
> You received this bug notification because you are a direct subscriber
> of the bug.
>
> Status in Ubuntu: Confirmed
>
> Bug description:
> 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.
> ste@ste-ubuntu:~$ 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!!!
>