Stefan Klein <[EMAIL PROTECTED]> wrote: > If I use exactly the same commands / mount options as you I get less than > 1MB/s.... > > I know that I cannot expect a "good" performance with the CF card, but 5MB/s > would just be fine :-)
I've started playing with a CF in a bigger machine, and the results are rather disappointing. wd1 at pciide2 channel 0 drive 0: <TRANSCEND> wd1: 1-sector PIO, LBA, 7775MB, 15924384 sectors wd1(pciide2:0:0): using PIO mode 4, Ultra-DMA mode 4 This is a new "266x" CF. Write performance is in the 200..300 kB/s range. It takes six hours or so to copy the OpenBSD CVS repository on that drive. Sequential read performance tops out at about 2300 kB/s. Random access read throughput--running CVS checkouts in parallel, local and NFS--ends at ~1750 kB/s. Interestingly, the older and supposedly slower CF in my Soekris 5501 wd0 at pciide0 channel 0 drive 0: <SanDisk SDCFH-1024> wd0: 4-sector PIO, LBA, 977MB, 2001888 sectors wd0(pciide0:0:0): using PIO mode 4, DMA mode 2 reads sequentially at just short of 5 MB/s. I suspect the main performance factor to be the N-sector capability. The Transcend generates an interrupt for each 512-byte sector (which eats a ridiculous share of CPU on my Opteron box), the SanDisk a fourth of that. IIRC, the SanDisk above is from their "Ultra II" line. I wonder how the newer "Extreme III" and "Extreme IV" perform. -- Christian "naddy" Weisgerber [EMAIL PROTECTED]
