On Thursday 27 September 2001 02:12 pm, Peter S Galbraith wrote: > Peter Jay Salzman wrote: > > i'm having a HECK of a time trying to get UDMA/100 transfer speeds on my > > system. > > > > hdparm -t reports 35 MB/s. this is nowhere near the 100MB/s that i'm > > expecting to get. > > Why are you expecting 100MB/s? That's the bus maximum bandwidth. > It doesn't mean you can physically read data off the disk platter > that fast. > > (5 years ago I was happy to get 7 MB/s of a disk.)
Yeah, that's pretty much where I stand today... I've got an old ATA33 disk. It's a Quantum Fireball 30GB disk. What sort of throughput should I be getting? nebula:/home/jasonb# hdparm -t -T /dev/hdb /dev/hdb: Timing buffer-cache reads: 128 MB in 2.09 seconds = 61.24 MB/sec Timing buffered disk reads: 64 MB in 8.96 seconds = 7.14 MB/sec /dev/hdb: multcount = 16 (on) I/O support = 0 (default 16-bit) unmaskirq = 0 (off) using_dma = 0 (off) keepsettings = 0 (off) nowerr = 0 (off) readonly = 0 (off) readahead = 8 (on) geometry = 3649/255/63, sectors = 58633344, start = 0 Last time I messed with hdparm and tried to tweak the settings I ended up with WORSE performance (I believe I ended up with 4MB/sec buffered disk reads instead of 7MB/sec). Ideas? > Peter
