>I've tried most of the tests you all have been discussing, with a couple
>of exceptions. I haven't tried bonnie ( don't even know where to get it
>or what it is supposed to test ).
>
Well, it's part of the SuSE distribution at least, and it tests hard
disk performance - you need to give it a test size greater than your
system's memory or all you're testing is Linux's ability to buffer reads
and writes. :-) So for my 512Mb system I use "bonnie -s 1024"
>><redundant>as long as you're sure you do have DMA enabled that is - SuSE
>>at least leaves it disabled by default, under which conditions all
>>kernels are stable for me</redundant>
>>
>
>Fairly certain. I could be misinterpreting things, though. Here is some
>output I'm seeing:
>
Compare:
>[root@localhost /root]# hdparm -tT /dev/hde
>
>/dev/hde:
> Timing buffer-cache reads: 128 MB in 0.70 seconds =182.86 MB/sec
> Timing buffered disk reads: 64 MB in 2.31 seconds = 27.71 MB/sec
>
root@hex:/home/rachel > hdparm -tT /dev/hde
/dev/hde:
Timing buffer-cache reads: 128 MB in 0.66 seconds =193.94 MB/sec
Timing buffered disk reads: 64 MB in 2.11 seconds = 30.33 MB/sec
>[root@localhost /root]# hdparm /dev/hde
>
>/dev/hde:
> 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 = 3649/255/63, sectors = 58633344, start = 0
>
root@hex:/home/rachel > hdparm /dev/hde
/dev/hde:
multcount = 16 (on)
I/O support = 3 (32-bit w/sync)
unmaskirq = 0 (off)
using_dma = 1 (on)
keepsettings = 0 (off)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 79780/16/63, sectors = 80418240, start = 0
I have 32-bit IO (with sync) and multiple sector transfers enabled,
where you don't. I don't expect that's the cause of the problem though -
For instance, I can run reliably with any kernel with those enabled, as
long as DMA is disabled.
>
>[root@localhost /root]# hdparm -i /dev/hde
>
>/dev/hde:
>
> Model=WDC WD300BB-00AUA1, FwRev=18.20D18, SerialNo=WD-WMA6W1592536
> Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq
>}
> RawCHS=16383/16/63, TrkSize=57600, SectSize=600, ECCbytes=40
> BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=off
> CurCHS=16383/16/63, CurSects=-66060037, LBA=yes, LBAsects=58633344
> 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 udma0 udma1 udma2 udma3 udma4 *udma5
>
root@hex:/home/rachel > hdparm -i /dev/hde
/dev/hde:
Model=IBM-DTLA-305040, FwRev=TW4OA60A, SerialNo=YJEYJLG3070
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=40
BuffType=DualPortCache, BuffSize=380kB, MaxMultSect=16, MultSect=16
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=80418240
IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 *udma5
Drive Supports : Reserved : ATA-2 ATA-3 ATA-4 ATA-5
Kernel Drive Geometry LogicalCHS=79780/16/63 PhysicalCHS=79780/16/63
. o O ( Dont' suppose any of this is useful to anyone... )
-- Rachel
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