In article <fa.gp91u1v.195qi0a@ifi.uio.no>, Meelis Roos <mroos@linux.ee> writes:
> AH> Use it and complain, boast, or nothing.........being a bench warmer will
> AH> continue the status of "EXPERIMENTAL".
OK Here goes.
I have a Jetway J-542B MB with 64MB RAM and a K6-2/333 CPU. I am running
kernel 2.3.37.
00:00.0 Host bridge: Acer Laboratories Inc. M1541 (rev 04)
00:01.0 PCI bridge: Acer Laboratories Inc.: Unknown device 5243 (rev 04)
00:07.0 ISA bridge: Acer Laboratories Inc. M1533 (rev b4)
00:0f.0 IDE interface: Acer Laboratories Inc. M5229 (rev 20)
>From dmesg I have,
Uniform Multi-Platform E-IDE driver Revision: 6.21
ALI15X3: IDE controller on PCI bus 00 dev 78
ALI15X3: not 100% native mode: will probe irqs later
ide0: BM-DMA at 0xf000-0xf007, BIOS settings: hda:DMA, hdb:pio
ide1: BM-DMA at 0xf008-0xf00f, BIOS settings: hdc:pio, hdd:pio
hda: Maxtor 90680D4, ATA DISK drive
hdc: QUANTUM FIREBALL CX10.2A, ATA DISK drive
hdd: TAEIL CDD-7320T, ATAPI CDROM drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
ALI15X3: MultiWord DMA enabled
hda: Maxtor 90680D4, 2014MB w/256kB Cache, CHS=826/255/63, (U)DMA
ALI15X3: MultiWord DMA enabled
hdc: QUANTUM FIREBALL CX10.2A, 9787MB w/418kB Cache, CHS=19885/16/63, (U)DMA
hdd: ATAPI 20X CD-ROM drive, 128kB Cache
Uniform CD-ROM driver Revision: 3.06
After booting hdparm /dev/hda gives,
multcount = 0 (off)
I/O support = 0 (default 16-bit)
unmaskirq = 0 (off)
using_dma = 1 (off)
readahead = 8 (on)
So far, so good?
Here are my hdparm -tT /dev/hda results,
/dev/hda:
Timing buffer-cache reads: 128 MB in 3.04 seconds =42.11 MB/sec
Timing buffered disk reads: 64 MB in 9.73 seconds = 6.87 MB/sec
I am disappointed by the 6.87MB/sec. Shouldn't it be much more? With
using_dma=0 I get 4-5MB/sec. NB: The Maxtor HD is a UDMA/Mode2 device and
its specs say,
DATA TRANSFER RATE:
To/From Interface: ....................... Up to 33.0 MBs
To/From Media: ........................... Up to 18.6 MBs
A couple of supplementary points/questions: My kernel is reporting
'ALI15X3: MultiWord DMA enabled' rather than 'ALI15X3: Ultra DMA enabled'
as Meelis' does. Any ideas why?
According to Western Digital's UDMA info webpage, 'multiword DMA mode 2'
should give a max. data-rate of 16.6MB/sec - much more than I get.
> Positive results on 2 computers.
[system details cut]
> /dev/hda:
> Timing buffered disk reads: 64 MB in 10.82 seconds = 5.91 MB/sec
This is very similar to the figure I get...
> /dev/hdb:
> Timing buffered disk reads: 64 MB in 4.10 seconds =15.61 MB/sec
> /dev/hdc:
> Timing buffered disk reads: 64 MB in 4.32 seconds =14.81 MB/sec
>
> Strange that hda is slower than hdb, since these disks are identical.
Any Suggestions ??
Thanks
Tom.
-- Tom Crane, Dept. Physics, Royal Holloway, University of London, Egham Hill, Egham, Surrey, TW20 0EX, England. Email: uhap023@vms.rhbnc.ac.uk SPAN: 19.875 Fax: 01784 472794- 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/
This archive was generated by hypermail 2b29 : Sat Jan 15 2000 - 21:00:18 EST