3ware 9000 Controller Extremely Slow Performance

Ive not much experience with such things; I have setup a RAID5 on a
3ware 9500S-MI8 controller using the cards utility. I have created a
reiserfs partition on this drive, i access via /dev/sda, installed
gentoo. The kernel contains the 3w_9xxx driver as well as PIIX ide
driver for my i875 intel board. My problem isn't one of functionality
but one of speed, it is painfully slow. I might note as well that this
is a 32bit pci card.

Here's what a hdparm -tT /dev/sda yields

/dev/sda
Timing Cached Reads: 60MB in 2.14 seconds = 20.06 MB/sec
Timing Buffered Disk Reads: 22MB in 3.12 seconds = 7.05 MB/sec

I have no experience with raid controllers so my initial thoughts were
no dma, io @ 16bit, but these are not options via hdparm on /dev/sda.
I looked through tw_cli man page to find anything related to
performance and found nothing except about cache, which was on, and a ?
profile? being set to performance ?if bbu is turned off? which wasn't
much relevant. I cant find anyone with similar performance searching
on google either for the past 5 hours.

Does anyone have any ideas, advice, anything? Im starting to feel a
bit lost to this problem, if it is indeed a problem and not simply a
result of my hardware configuration.
.

Relevant Pages

  • IT821x: no DMA since 2.6.21
    ... Since 2.6.21 I have a problem with the it821x driver on my ITE 8212 ... IT8212: IDE controller at PCI slot 0000:00:09.0 ... hdf: ... and hdparm does not work anymore: ...
    (Linux-Kernel)
  • Re: IT821x: no DMA since 2.6.21
    ... Back on 2.6.20 - here is some output from the working driver. ... IT8212: IDE controller at PCI slot 0000:00:09.0 ... BUG DMA OFF ... But hdparm works: ...
    (Linux-Kernel)
  • RAID ate my PCIe-PCI bridges MMIO address space (?)
    ... When I boot a live CD of the same distro with the same kernel the soundcard ... Note that fglrx or no fglrx, as well as Intel HDA driver or no HDA driver, ... 0000:00:12.0: OHCI Host Controller ... cannot reserve MMIO region ...
    (Linux-Kernel)
  • Re: Intel PRO/1000CTcontroller & SuSE Pro 8.2 (MSI 875P Neo-FIS2R)
    ... SuSE 8.2 fresh does not detect the integrated controller. ... driver separately. ... number of MP IRQ sources: ... ACPI: Power Resource ...
    (alt.os.linux.suse)
  • Re: 2.6.11-rc1-mm2
    ... CPU: Trace cache: 12K uops, ... PCI: PCI BIOS revision 2.10 entry at 0xf1e50, ... PCI: Ignoring BAR0-3 of IDE controller 0000:00:1f.1 ... usbcore: registered new driver usbfs ...
    (Linux-Kernel)
Quantcast