Thanks for the pictures.
You know, you can upload pictures at http://imageshack.us/
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Pics are up
Finally got them up on a site. I can't hotlink them here, Angelfire sucks like that. I created the most basic of basic pages for display pursposes here:
http://www.angelfire.com/rpg2/tweakit/index.htmlLast edited by halfmanhalfamazing; 15 August 2007, 11:37 AM.
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Originally posted by halfmanhalfamazing View PostThis is the Extreme 3 card:
/sbin/hdparm -i /dev/hdc
/dev/hdc:
Model=SanDisk SDCFX3-4096, FwRev=HDX 4.08, SerialNo=116918E2707D4818
Config={ HardSect NotMFM Removeable DTR>10Mbs nonMagnetic }
RawCHS=7964/16/63, TrkSize=0, SectSize=576, ECCbytes=4
BuffType=DualPort, BuffSize=1kB, MaxMultSect=4, MultSect=4
CurCHS=7964/16/63, CurSects=8027712, LBA=yes, LBAsects=8027712
IORDY=no, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 *mdma2
AdvancedPM=no WriteCache=disabled
Drive conforms to: Unspecified: ATA/ATAPI-4
* signifies the current active mode
I noticed this line:
Config={ HardSect NotMFM Removeable DTR>10Mbs nonMagnetic }
I ran this on the EX3 card:
# hdparm -Tt /dev/hdc
/dev/hdc:
Timing cached reads: 788 MB in 2.00 seconds = 393.73 MB/sec
Timing buffered disk reads: 20 MB in 3.16 seconds = 6.33 MB/sec
I'd bet that's what it is. Wherever that configuration is set at, that's the problem. May not even be driver related; just some text/config file somewhere that's doing it.
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This is the Extreme III card:
/sbin/hdparm -i /dev/hdc
/dev/hdc:
Model=SanDisk SDCFX3-4096, FwRev=HDX 4.08, SerialNo=116918E2707D4818
Config={ HardSect NotMFM Removeable DTR>10Mbs nonMagnetic }
RawCHS=7964/16/63, TrkSize=0, SectSize=576, ECCbytes=4
BuffType=DualPort, BuffSize=1kB, MaxMultSect=4, MultSect=4
CurCHS=7964/16/63, CurSects=8027712, LBA=yes, LBAsects=8027712
IORDY=no, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 *mdma2
AdvancedPM=no WriteCache=disabled
Drive conforms to: Unspecified: ATA/ATAPI-4
* signifies the current active modeLast edited by halfmanhalfamazing; 25 June 2007, 09:06 AM.
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Just as a reference point, here's what I'm expecting from this extreme IV card.
http://www.robgalbraith.com/bins/con...id=7-7896-8475
Most benchmarks put it in the 30MB+/- range, but at the bare minimum it should be 20MB+/-.Last edited by halfmanhalfamazing; 25 June 2007, 09:06 AM.
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# hdparm -Tt /dev/hdc
/dev/hdc:
Timing cached reads: 788 MB in 2.00 seconds = 393.17 MB/sec
Timing buffered disk reads: 20 MB in 3.10 seconds = 6.45 MB/sec
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Originally posted by glussier View PostTher's actually UDMA mode 3 activated for that card, which means a maximum transfer speed of 44mB/sec. When you load an application or boot your computer, you are actually loading multiple files, so what is most important is not the transfer speed as such but the latency. With the memory card, it doesn't matter where the files are stored, the latency is pretty much the same, no matter where the files are stored on it, with a hard drive, the controller has to mode the reading/writing heads, which takes a lot of time.
But there's still that issue of having to pass off the IDE=NODMA command at bootloader time.
If I don't do that, the system hangs and I get DMA timeouts. It'll eventually boot, but I could cook dinner in the amount of time that passes by.
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Originally posted by halfmanhalfamazing View PostAgreed. I knew going into all of this that access times were going to be a net benefit, but it wasn't until I saw the transfer rate numbers that I realized just how much of a difference that access times truely mean.
Unfortunately, much of our disk accesses on most machines are more like the CD than the multi-terabyte transfer in the above analogy. That's why "counterintiuitive" things happen like that "low" speed flash disk either over USB or over PATA/SATA seeming to be a LOT faster than the "fast" SATA disk drives we have nowadays.
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Originally posted by halfmanhalfamazing View PostYes Sir.
# /sbin/hdparm -i /dev/hdc
/dev/hdc:
Model=SanDisk SDCFX-4096, FwRev=HDX 4.04, SerialNo=012222C1207Q0359
Config={ HardSect NotMFM Removeable DTR>10Mbs nonMagnetic }
RawCHS=7964/16/63, TrkSize=0, SectSize=576, ECCbytes=4
BuffType=DualPort, BuffSize=1kB, MaxMultSect=4, MultSect=4
CurCHS=7964/16/63, CurSects=8027712, LBA=yes, LBAsects=8027712
IORDY=no, 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 udma3 *udma4
AdvancedPM=no WriteCache=disabled
Drive conforms to: Unspecified: ATA/ATAPI-4
* signifies the current active mode
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Originally posted by Svartalf View PostAaahh... The fun of benchmarking things.
What precisely are you measuring when you set up a metric?
Michael's got a fun job of trying to come up with things that actually have meaning when he does his performance comparisons (Which, by the way, keep doing the great work you have been doing in that space...).
In the case of disk performance, data throughput speed IS important, but it's only a piece of the puzzle.
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