lkml.org 
[lkml]   [2000]   [Mar]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRE: max UDMA33 IDE performace ?
Date
I have the same disk and get ~15-21 MB/sec with a BX chipset.  I also
noticed
the "maxDMA=0(slow)" however I doubt that it has a meaning (I think it even
vanished in newer hdparm versions, your hdparm seems a bit dated it doesn't
even now about UDMA modes).

I have come to the conclusion that the UDMA33 implementation of certain
chipsets
is quite bad. Your results kind of confirm this observation. I also have
seen results where a Promise Ultra 33 (not 66) card has improved HD
performance
over a BX chipset.

--
Markus

> -----Original Message-----
> From: Harald Koenig [SMTP:koenig@tat.physik.uni-tuebingen.de]
> Sent: Monday, March 06, 2000 10:01 AM
> To: linux-kernel-list
> Subject: max UDMA33 IDE performace ?
>
> which max. sustained read performace can be expected with UDMA33 ?
>
> I have a 40GB 7200rpm Maxtor disk which should give min/max 16.7/29.0
> MB/sec
> accoring to a benchmark test in german c't magazine.
>
> but with DFI K6BV3+ main board (MVP3 chipset, only supports UDMA33 not
> UDMA66),
> AMD K6/2-400, 128MB PC100 ram, 2MB L2 cache only get ~11-14 MB/sec read
> rate.
> I noticed the "maxDMA=0(slow)" in "hdparm -i" output but can't find any
> hint how to change this.
>
> is there any chance to improve/tune performace, or is UDMA33 the real
> limit ?
> do I need UDMA66 for 20-30 MB/sec ? why?
>
>
> from startup (2.3.47):
>
> Uniform Multi-Platform E-IDE driver Revision: 6.30
> VP_IDE: IDE controller on PCI bus 00 dev 39
> VP_IDE: not 100% native mode: will probe irqs later
> VT 82C598 Apollo MVP3 Chipset Core ATA-33
> Split FIFO Configuration: 16 Primary buffers, threshold = 3/4
> 0 Second. buffers, threshold = 1/2
> ide0: BM-DMA at 0xd000-0xd007, BIOS settings: hda:DMA, hdb:DMA
> ide0: VIA Bus-Master (U)DMA Timing Config Success
> hda: Maxtor 54098U8, ATA DISK drive
> ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
> hda: Maxtor 54098U8, 39082MB w/2048kB Cache, CHS=4982/255/63, UDMA(33)
> Partition check:
> hda: [EZD] [remap 0->1] [4982/255/63] hda1 hda2 hda3 hda4
>
> # hdparm -tT /dev/hda
>
> /dev/hda:
> Timing buffer-cache reads: 64 MB in 0.89 seconds =71.91 MB/sec
> Timing buffered disk reads: 32 MB in 2.35 seconds =13.62 MB/sec
> # hdparm /dev/hda
>
> /dev/hda:
> multcount = 0 (off)
> I/O support = 0 (default 16-bit)
> unmaskirq = 0 (off)
> using_dma = 1 (on)
> keepsettings = 0 (off)
> nowerr = 0 (off)
> readonly = 0 (off)
> readahead = 8 (on)
> geometry = 4982/255/63, sectors = 80041248, start = 0
>
> # hdparm -i /dev/hda
>
> /dev/hda:
>
> Model=Maxtor 54098U8, FwRev=DA620CQ0, SerialNo=K803ENKC
> Config={ Fixed }
> RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57
> BuffType=3(DualPortCache), BuffSize=2048kB, MaxMultSect=16, MultSect=off
> DblWordIO=no, maxPIO=2(fast), DMA=yes, maxDMA=0(slow)
> CurCHS=4047/16/255, CurSects=16511760, LBA=yes, LBAsects=80041248
> tDMA={min:120,rec:120}, DMA modes: mword0 mword1 mword2
> IORDY=on/off, tPIO={min:120,w/IORDY:120}, PIO modes: mode3 mode4
>
>
> Harald
> --
> All SCSI disks will from now on ___ _____
> be required to send an email notice 0--,| /OOOOOOO\
> 24 hours prior to complete hardware failure! <_/ / /OOOOOOOOOOO\
> \ \/OOOOOOOOOOOOOOO\
> \
> OOOOOOOOOOOOOOOOO|//
> Harald Koenig, \/\/\/\/\/\/\/\/\/
> Inst.f.Theoret.Astrophysik // / \\ \
> koenig@tat.physik.uni-tuebingen.de ^^^^^ ^^^^^
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.rutgers.edu
> Please read the FAQ at http://www.tux.org/lkml/

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:56    [W:0.039 / U:0.240 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site