On Mon, 21 Mar 2005 23:09:42, Andrew Morton wrote: > "Miquel van Smoorenburg" <[EMAIL PROTECTED]> wrote: > > > > I just upgrades one of our newsservers from 2.6.9 to 2.6.11. I > > use "iostat -k -x 2" to see live how busy the disks are. But > > I don't believe that Linux optimizes things so much that a disk > > can be 1849.55% busy :) > > > > (you'll have to stretch out your xterm to be able to read this): > > > > Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s > > avgrq-sz avgqu-sz await svctm %util > > hda 0.00 50.00 0.00 18.18 0.00 545.45 0.00 272.73 > > 30.00 2.35 129.00 86.25 156.82 > > hdc 0.00 45.45 77.27 31.82 3927.27 618.18 1963.64 309.09 > > 41.67 6.27 57.42 38.42 419.09 > > hdd 4.55 0.00 63.64 0.00 68.18 0.00 34.09 0.00 > > 1.07 1.11 17.43 17.43 110.91 > > hde 477.27 0.00 45.45 0.00 522.73 0.00 261.36 0.00 > > 11.50 0.40 8.90 8.90 40.45 > > hdg 18.18 70154.55 22.73 172.73 40.91 70727.27 20.45 35363.64 > > 362.07 1010.36 1127.72 94.63 1849.55 > > > > With 2.6.9, %util never came above 100% (and that was indeed "fully loaded". > > I have systems with a comparable load running 2.6.10 and 2.6.11-rc3-bk4 > > that also don't show this behaviour (but those are SCSI, not IDE). > > > > I use CFQ, but changing that to deadline doesn't make a difference. > > > > Mike, did you ever get to the bottom of this? Still happening in 2.6.12-rc1?
Sortof... (I already posted this before:) the siimage.c driver was broken for me with 2.6.11. Lots of IDE warning messages to /dev/console @ 9600 baud also makes things slow and weird. I couldn't find what caused this, though, there weren't much (if any) changes in siimage.c so it must have been something different. Perhaps the IRQ changes. I moved to sata_sil.c and everything now works fine. I tried sata_sil around 2.6.5 or so, and it was very unstable, but I was pleasantly surprised to see that the new SATA code has come a long way. So I still don't know what the _actual_ problem was, but the solution is "use libata instead of the old IDE driver". As "make menuconfig" tells you something similar it's probably an acceptable solution. Mike. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
