On a net5501 with NetBSD 5.1_STABLE (not what you asked, but close enough to be interesting :-), I get
gdt 2 ~ > dd if=/dev/rwd0d of=/dev/null bs=128k ^C1747+0 records in 1747+0 records out 228982784 bytes transferred in 8.162 secs (28054739 bytes/sec) This is with a very old PATA drive, circa 2003 I think: viaide0 at pci0 dev 20 function 2 viaide0: Advanced Micro Devices CS5536 IDE Controller (rev. 0x01) viaide0: bus-master DMA support present viaide0: primary channel wired to compatibility mode viaide0: primary channel interrupting at irq 14 atabus0 at viaide0 channel 0 viaide0: secondary channel wired to compatibility mode viaide0: secondary channel ignored (disabled) wd0 at atabus0 drive 0: <FUJITSU MHT2040AT> wd0: drive supports 16-sector PIO transfers, LBA addressing wd0: 38154 MB, 77520 cyl, 16 head, 63 sec, 512 bytes/sect x 78140160 sectors wd0: 32-bit data port wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 5 (Ultra/100) wd0(viaide0:0:0): using PIO mode 4, Ultra-DMA mode 5 (Ultra/100) (using DMA) but still 28 MB/s seems slow, even for an old notebook drive. So I wonder if the controller is maxing out before the drive. (I'm still not sure if you are using dd to a file in the filesystem, or if you're talking about using the raw device as I did above.) What are other people seeing with PATA and SATA drives? Can you post your dmesg?
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