On Dec 4, 2014, at 12:46 AM, Roger Pau Monné <[email protected]> wrote: > Hello, > > El 04/12/14 a les 3.27, David P. Discher ha escrit: >> So, the “working” part … the hypervisor up, and Dom0 running, is correct. >> >> However, after ~5 minutes, the AHCI buses timeout. This seems to be >> constantly >> reproducible via Dom0. FreeBSD on the this bare metal does’t have this >> issue. > > If you boot Xen with iommu=debug, do you see any messages on the Xen > console? > > My test boxes also use AHCI, but the chipset is not exactly the same > (mine is ICH8, yours is ICH10). Do you do anything specific to trigger > the timeout, or just leaving Dom0 in an idle state also triggers this? > > Could you switch to the Xen console and post the output of the "i" debug > key when this happens? > > Also, you can try to play with the AHCI driver sysctls, to see if some > of them have any effect. I would recommend trying to disable MSI > interrupts (hint.ahci.X.msi=0) and power control (hint.ahcich.X.pm_level=0). Yes, ICH10. I’m not sure if an idle Dom0 does this, however limited access to the disks, even just editing things like /boot/loader.conf and /etc/rc.conf will eventually hang. But I’m also trying to launch a DomU, and for the convince of a documented process, I’m following your debian steps … and the debian installer is running. I’m running a zpool mirror across 4k aligned GPT partitions for the root drive. I’ll also attempt to break break the mirror, as I don’t remember this being a problem with a single drive. As first step last night, I actually moved the msi interrupts to = 2, instead of fully disabled. And this helped a little. It seemed to allow the AHCI driver to recovered after the first several timeouts. I will try disabling MSI as well and well as iommu debug. However, I’m still without a Xen console. Durning the ACPI/pci probing … my console over SOL com3 cuts out. I haven’t try to recover it yet. I will see what I can do. However, from what it looks like, Xen kernel is latching on the com port, and freebsd sees it as “busy”. I’ll see what I can figure out. I believe the pm_level is default to 0, but will double check that. - David P. Discher http://davidpdischer.com/ AIM: DavidDPD | Y!M: daviddpdz
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