[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] XenServer Xen-4.5 (-rc3ish) testing
On 09/12/14 08:46, Jan Beulich wrote: >> We have certain machines which are showing reliable failure to boot >> under Xen-4.5, where they worked with 4.4. Symptoms range from the dom0 >> kernel crashing before printing anything, to complaining that the initrd >> is corrupt when attempting to decompress. This appears to be hardware >> specific. > Any chance this is C-state related, just like narrowed down to for > http://lists.xenproject.org/archives/html/xen-devel/2014-11/msg00228.html? > I.e. Westmere Xeons being affected? If not, this would seem rather > worrying to me (read: a release blocker). And even if so, a workaround > would be minimally needed. Otoh you didn't report so for earlier RCs - > was that just because the testing scope was more narrow then, or can > we imply that this is a recently introduced regression? > > Jan > I very much doubt it. We blanket set max cstate to 1 on that era of hardware, because the existing workarounds in Xen still experimentally don't work. https://github.com/xenserver/xen-4.4.pg/blob/master/detect-nehalem-c-state.patch The first system I am looking at with a view to fixing is a SandyBridge EN IBM Blade. ~Andrew _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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