Re: [Xen-devel] Trying to track down odd behavior, errors in xen dmesg

[Keith Swett <swettk@xxxxxxxxx>]

Not a problem, would be happy to beta test.  Send the patches my way
whenever they're available.
Would you like me to be building against the debian-src of the
packages or would another tree be more beneficial?

--Keith

On Fri, Apr 8, 2011 at 8:53 AM, Konrad Rzeszutek Wilk
<konrad.wilk@xxxxxxxxxx> wrote:
> 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@xxxxxxxxx> 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@xxxxxxxxxx> 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@xxxxxxxxxx> 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@xxxxxxxxxx> 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@xxxxxxxxxxxxxxxxxxx
>> >>> >> >> http://lists.xensource.com/xen-devel
>> >>> >> >
>> >>> >>
>> >>> >> _______________________________________________
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>> >>> >> Xen-devel@xxxxxxxxxxxxxxxxxxx
>> >>> >> http://lists.xensource.com/xen-devel
>> >>> >
>> >>>
>> >>> _______________________________________________
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>> >>
>> >
>>
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>

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