nforce4, SATA and a low HD performance
board A8N-SLI, nforce4, Debian Etch AMD64, Athlon64x2, 2GB, 2 SATA and 1 IDE disk.
Linux kirk 2.6.20-rc6 #5 SMP PREEMPT Wed Jan 31 13:34:55 NZDT 2007 x86_64 GNU/Linux
frustrating times: although I thought that the sata_nv driver in the new kernel branch 2.6.20-rcX supports ADMA/UCQ the disk performance hasn't changed at all.
hdparm -Tt /dev/sda
Timing cached reads: 1370 MB in 2.00 seconds = 684.76 MB/sec
Timing buffered disk reads: 162 MB in 3.01 seconds = 53.76 MB/sec
hdparm -Tt /dev/sdb
Timing cached reads: 1434 MB in 2.00 seconds = 716.94 MB/sec
Timing buffered disk reads: 224 MB in 3.00 seconds = 74.56 MB/sec
see also the dmesg log attached. Has anyone a clue why the performance of the SATA disks is slightly below the the old IDE disk?