DragonFly BSD
DragonFly bugs List (threaded) for 2009-10
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Re: vkernel stuck in umtxsl state when booting from a NFS root mount

From: Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>
Date: Fri, 9 Oct 2009 18:04:57 -0700 (PDT)

:When booting a vkernel with '-n 1' I'm not sure when was the last time that it
:got stuck, while booting with '-n 2' fails in most if not all cases.

    Ok, all the NFS issues with vkernels should now be fixed.  There were
    several problems but the ones causing the permanent stalls were

    (1) NFS was running the kernel out of mbufs, and

    (2) The NFS root mount was NFSv2 instead of NFSv3, and there appears
	to be bugs with large write()s on NFSv2 mounts.

    I also changed the default mount type from UDP to TCP which will improve

    I have not figured out what the problem with NFSv2 write()'s is yet.
    I'm still working on that one.  But the vkernel should now mount w/
    NFSv3 and thus work around that issue.


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