> On Sun, 2002-05-26 at 10:52, Phil Payne wrote: > > > Your I/O bus is typically PCI however so you are limited to about > > > 100Mbytes/second I/O throughput in the real world. > > > > I would regard 100Mb/sec as a peak (instantaneous) transfer rate. Throughp > ut will be only a > > fraction of that. On some tests only a small fraction. > > That really depends on the system. On an Athlon with 64bit PCI I can do > 150Mbyte/second peak I/O , 120Mbyte/second sustained. Thats with about > $10,000 of loaner hard disks. The sustained disk read/write speed for a > single UDMA hard disk is about a magnitude lower.
Well, ... [root@numbat root]# hdparm -t /dev/hda /dev/hda: Timing buffered disk reads: 64 MB in 1.86 seconds = 34.41 MB/sec [root@numbat root]# hdparm -t /dev/hda /dev/hda: Timing buffered disk reads: 64 MB in 1.85 seconds = 34.59 MB/sec [root@numbat root]# hdparm -t /dev/hda /dev/hda: Timing buffered disk reads: 64 MB in 1.84 seconds = 34.78 MB/sec [root@numbat root]# I wouldn't want anyone to think Alan means 15 Mbytes/sec. I can do better than that on a P II/233. Bonnie does produce a similar figure. -- Cheers John Summerfield Microsoft's most solid OS: http://www.geocities.com/rcwoolley/ Note: mail delivered to me is deemed to be intended for me, for my disposition. ============================== If you don't like being told you're wrong, be right!
