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ahcisata poor performance


Can someone tell - is there a way to inspect poor hard drive performance?

Two computers - windows and linux, SMB and NFS connected to NetBSD host.

Writing over SMB (GE interface) freeze linux NFS client (writing few bytes
can take 2 seconds).

I believe thats hard drive problem because iostat show not more than 10MB/s
even copying locally on NetBSD from one drive to another. Top show up to
10% interrupt.

Hardware is quite modern and this can be a problem, but I also could miss
proper raid or filesystem tunes.

ahcisata0 at pci0 dev 9 function 0: vendor 0x10de product 0x0ad4 (rev. 0xa2)
APSI: Picked IRQ 20 with weight 1
ahcisata0: interrupting at ioapic0 pin 20
ahcisata0: 64-bit DMA
ahcisata0: AHCI revision 1.20, 6 ports, 32 slots, CAP 

wd0(ahcisata0:0:0): using PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133) 
(using DMA)
wd1 at atabus2 drive 0
wd1: <ST3000VN000-1H4167>
wd1: drive supports 16-sector PIO transfers, LBA48 addressing
wd1: 2794 GB, 5814021 cyl, 16 head, 63 sec, 512 bytes/sect x 5860533168 sectors

000:09:0: NVIDIA nForce MCP77 AHCI Controller (SATA mass storage, interface 
0x01, revision 0xa2)

Sincerelly yours

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