Messages in this thread | | | Date | Tue, 01 Dec 1998 20:35:37 +0000 | From | Mark Lord <> | Subject | Re: IDE-DMA strangeness (another one) |
| |
Rik van Riel wrote: > > Hi, > > I've just moved my IDE disks around, taking out an old > disk and moving my new 6.4GB disk from hdd to hda. > > With this move I saw in improvement (hdparm -t) from 3 > to 8.4 (!) MB/second... Now I wonder what kind of bug > in the Linux I/O subsystem could hold performance back
Heck, I see wild swings without moving anything around.
Sometimes my induhvidual drives show 13MB/sec, sometimes they show 8MB/sec.
Sometimes my raid0 shows 22MB/sec, sometimes 18MB/sec, and sometimes 6MB/sec.
Just weird scheduling effects or buffer-cachisms on an otherwise idle machine. Most peculiar. -- mlord@pobox.com (author of hdparm)
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/
| |