Am Samstag 06 November 2010 20:58:12 schrieb Stefan Hajnoczi: > On Fri, Nov 5, 2010 at 5:16 PM, Hermann Himmelbauer <dusty@xxxxxxx> wrote: > > I experience strange disk I/O stucks on my Linux Host + Guest with KVM, > > which make the system (especially the guests) almost unusable. These > > stucks come periodically, e.g. every 2 to 10 seconds and last between 3 > > and sometimes over 120 seconds, which trigger kernel messages like this > > (on host and/or guest): > > > > INFO: task postgres:2195 blocked for more than 120 seconds > > The fact that this happens on the host too suggests there's an issue > with the host software/hardware and the VM is triggering it but not > the root cause. > > Does dmesg display any other suspicious messages? No, there's anything that can be seen via dmesg. I at first suspected the hardware, too. I can think of the following reasons: 1) Broken SATA cable / Harddisks - I changed some cables, no change, thus this is probably ruled out. I also can't see anything via S.M.A.R.T. Moreover, the problem is not bound to a specific device, instead it happens on sda - sdd, so I doubt it's harddisk related. 2) Broken Power Supply / Insufficient Power - I'd expect either a complete crash or some error messages in this case, so I'd rather rule that out. 3) Broken SATA-Controller - I cannot think of any way to check that, but I'd also expect some crashes or kernel messages. I flashed the board to the latest BIOS version, no change either. However, it seems no one except me seems to have this problem, so I'll buy a new, similar but different mainboard (Intel instead of Asus), hopefully this solves the problem. What do you think, any better idea? Anyway, thanks for your reply! Best Regards, Hermann -- hermann@xxxxxxx GPG key ID: 299893C7 (on keyservers) FP: 0124 2584 8809 EF2A DBF9 4902 64B4 D16B 2998 93C7 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
