Re: Trying to track down odd behavior, errors in xen dmesg

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Fri, Apr 08, 2011 at 08:40:10AM -0500, Keith Swett wrote:
> Another update:
> 
> Retested using Xen 4.0.1-2 (i386 install)
> and Dom0 Kernel 2.6.32-5-xen-686
> with the same kernel for the domU.  The same strange behavior still
> shows up when using iSCSI backing.

So way back at VirtualIron we had some of these issues (if this 
is the same issue) and we fixed it by holding on the pages that
went to the network stack and took a bit of time to get back.

I was going to dust them of next week to prepare the blkback for
upstream submission. Are you up for being a beta-tester? Will
require some kernel recompilation.

> 
> --Keith
> 
> On Thu, Apr 7, 2011 at 11:39 AM, Keith Swett <swettk@gmail.com> wrote:
> > Here's a summary:
> >
> > All installs are Debian Squeeze
> >
> > These stay the same for all tests:
> > Host is Xen 4.0.1-2 (AMD64 install)
> > Dom0 Kernel is 2.6.32-5-xen-amd64
> >
> > Test procedure:
> > Install Debian Distro via PXE boot using HVM.
> > If successful, install xen version of kernel, reboot in non-HVM mode.
> >
> > DomUs:
> >
> > with iSCSI:
> > debian pxe netboot installer i386 in HVM mode WORKS (disk detects as
> > Qemu hard drive)
> > FAIL after installing a xen kernel (linux-image-xen-686_2.6.32+29) and
> > switching to builder=linux
> >
> > debian pxe netboot installer AMD64 in HVM mode FAIL (disk detects as
> > Xen Virtual Hard drive)
> >
> > with AOE:
> > debian pxe netboot installer AMD64 in HVM mode FAIL (disk detects as
> > Xen Virtual Hard drive)
> >
> > with LVM:
> > debian pxe netboot installer i386 in HVM mode WORKS (disk detects as
> > Qemu hard drive)
> > WORKS after installing a xen kernel (linux-image-xen-686_2.6.32+29)
> > and switching to builder=linux
> >
> > debian pxe netboot installer AMD64 in HVM mode WORKS (disk detects as
> > Xen Virtual hard drive)
> > WORKS after installing a xen kernel
> > (linux-image-2.6-xen-amd64_2.6.32+29) and switching to builder=linux
> >
> > the tests for physical drives are identical to the LVM tests.
> >
> > In all FAIL cases, similar messages appear in xm dmesg.
> >
> > --Keith
> >
> >
> >
> > On Thu, Apr 7, 2011 at 11:23 AM, Konrad Rzeszutek Wilk
> > <konrad.wilk@oracle.com> wrote:
> >> On Thu, Apr 07, 2011 at 11:02:55AM -0500, Keith Swett wrote:
> >>> Local disk, partition, and LVM all work correctly.
> >>
> >> And you mentioned that at the end and I completly missed it. Ooops.
> >> Sorry about that.
> >>
> >> You mentioned Xen 4.0.1... so when did this work? What kernel/hypervisor
> >> did not exhibit this problem?
> >>
> >>
> >>>
> >>> --Keith
> >>>
> >>> On Thu, Apr 7, 2011 at 11:01 AM, Konrad Rzeszutek Wilk
> >>> <konrad.wilk@oracle.com> wrote:
> >>> > On Thu, Apr 07, 2011 at 10:52:37AM -0500, Keith Swett wrote:
> >>> >> A bit more info to add, I just tested with AOE (ata over ethernet)
> >>> >> instead of iSCSI and I see the same issue.
> >>> >
> >>> > Sure, but does it occur if you devices that are not using the network.
> >>> > Like a local disk?
> >>> >
> >>> >>
> >>> >> --Keith
> >>> >>
> >>> >> On Thu, Apr 7, 2011 at 8:54 AM, Konrad Rzeszutek Wilk
> >>> >> <konrad.wilk@oracle.com> wrote:
> >>> >> > On Wed, Apr 06, 2011 at 11:30:02AM -0500, Keith Swett wrote:
> >>> >> >> Hi,
> >>> >> >>
> >>> >> >> I'm having a strange issue with Xen 4.0.1 AMD64 (debian squeeze).
> >>> >> >> I am importing a iSCSI lun into dom0 from a storage array (using
> >>> >> >> open-iscsi), this is used as the disk [phy:] for my domU.
> >>> >> >
> >>> >> >> If I use HVM, the install works correctly. As soon as I switch to pv
> >>> >> >> for the disk drivers (after installing a xen kernel in the domU) I get
> >>> >> >> a slew of messages in xm dmesg:
> >>> >> > This problem does not occur if the phy is pointing to a local disk?
> >>> >> >>
> >>> >> >> (XEN) grant-table.c:1956:d0 Could not get src frame 3f3149
> >>> >> >> (XEN) printk: 1851 messages suppressed.
> >>> >> >> (XEN) grant-table.c:1956:d0 Could not get src frame 3f3728
> >>> >> >> (XEN) printk: 1354 messages suppressed.
> >>> >> >> (XEN) grant-table.c:1956:d0 Could not get src frame 3f3485
> >>> >> >> (XEN) printk: 1890 messages suppressed.
> >>> >> >> (XEN) grant-table.c:1956:d0 Could not get src frame 3f3e58
> >>> >> >> (XEN) printk: 2153 messages suppressed.
> >>> >> >> (XEN) grant-table.c:1956:d0 Could not get src frame 3f3c9c
> >>> >> >> (XEN) printk: 1912 messages suppressed.
> >>> >> >> (XEN) grant-table.c:1956:d0 Could not get src frame 3f4287
> >>> >> >> (XEN) printk: 2287 messages suppressed.
> >>> >> >> (XEN) grant-table.c:1956:d0 Could not get src frame 3f40dc
> >>> >> >> Disk speed is very slow as well. Running DD in the domU to write a
> >>> >> >> file to disk causes more error messages to appear.  It also badly
> >>> >> >> corrupts the disk in some cases.
> >>> >> >> Testing from a local LVM works without error in all cases.
> >>> >> >>
> >>> >> >> Any suggestions?
> >>> >> >> --Keith
> >>> >> >>
> >>> >> >> _______________________________________________
> >>> >> >> Xen-devel mailing list
> >>> >> >> Xen-devel@lists.xensource.com
> >>> >> >> http://lists.xensource.com/xen-devel
> >>> >> >
> >>> >>
> >>> >> _______________________________________________
> >>> >> Xen-devel mailing list
> >>> >> Xen-devel@lists.xensource.com
> >>> >> http://lists.xensource.com/xen-devel
> >>> >
> >>>
> >>> _______________________________________________
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> >>> Xen-devel@lists.xensource.com
> >>> http://lists.xensource.com/xen-devel
> >>
> >
> 
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