Re: blktap2 problem with pvops kernel 2.6.32.13 and xen 4.0-rc1

[Fantu <fantonifabio@tiscali.it>]

Sorry, i wrong to write, is 4.0.1-rc1, i have always take from
xen-4.0-testing.hg last weeks about xen 4
Yesterday i have try tap2:aio in cfg files and work, is blktap how not work
with lenny, pv_ops kernel and xen 3.4.3 or 4.0
With tap2:aio minor ram used by dom0 but i see minor performance on domU
(mainly on start)
All important fix do in unstable are merged with xen-4.0-testing.hg?

Pasi Kärkkäinen wrote:
> 
> On Fri, May 28, 2010 at 04:27:33AM -0700, Fantu wrote:
>> 
>> thanks for reply
>> 
>> About blktap i not uderstand, always this error:
>> May 28 12:05:56 cpmcOR01AV BLKTAPCTRL[2775]: blktapctrl.c:790:
>> blktapctrl:
>> v1.0.0
>> May 28 12:05:56 cpmcOR01AV BLKTAPCTRL[2775]: blktapctrl.c:792: Found
>> driver:
>> [raw image (aio)]
>> May 28 12:05:56 cpmcOR01AV BLKTAPCTRL[2775]: blktapctrl.c:792: Found
>> driver:
>> [raw image (sync)]
>> May 28 12:05:56 cpmcOR01AV BLKTAPCTRL[2775]: blktapctrl.c:792: Found
>> driver:
>> [vmware image (vmdk)]
>> May 28 12:05:56 cpmcOR01AV BLKTAPCTRL[2775]: blktapctrl.c:792: Found
>> driver:
>> [ramdisk image (ram)]
>> May 28 12:05:56 cpmcOR01AV BLKTAPCTRL[2775]: blktapctrl.c:792: Found
>> driver:
>> [qcow disk (qcow)]
>> May 28 12:05:56 cpmcOR01AV BLKTAPCTRL[2775]: blktapctrl.c:792: Found
>> driver:
>> [qcow2 disk (qcow2)]
>> May 28 12:05:56 cpmcOR01AV BLKTAPCTRL[2775]: blktapctrl_linux.c:92:
>> couldn't
>> find device number for 'blktap0'
>> May 28 12:05:56 cpmcOR01AV BLKTAPCTRL[2775]: blktapctrl.c:859: couldn't
>> open
>> blktap interface
>> May 28 12:05:56 cpmcOR01AV BLKTAPCTRL[2775]: blktapctrl.c:922: Unable to
>> start blktapctrl
>> 
>> But module there is in kernel and is load (see lsmod) i have try also xen
>> 3.4.3, kernel 2.6.31 and 2.6.32 with some different config, always with
>> blktap option, also with =y and also try with sysfs deprecated option but
>> always nothing
>> 
> 
> Hmm.. are you really running Xen 4.0.0-rc1 ? If yes, then you should
> definitely 
> upgrade to Xen 4.0.0 final, or even better, to Xen 4.0.1-rc1.
> 
> There was some dom0 memory corruption bug fixed around Xen 4.0.0-rc6.
> 
> About your blktap2 problems.. dunno really. I'll try it myself some day
> and
> let's see how it goes.
> 
> -- Pasi
> 
>> I found also 1 problem on save of 1 domU and some of this line in log:
>> May 28 12:55:35 cpmcOR01AV kernel: [ 3000.882349] hrtimer: interrupt took
>> 4279522 ns
>> 
>> Here the syslog and kern.log if can help: 
>> http://old.nabble.com/file/p28705622/kern.log kern.log  
>> http://old.nabble.com/file/p28705622/syslog syslog 
>> And xend.log when stop some minute for problem on one domU save: 
>> http://old.nabble.com/file/p28705622/xend.log xend.log 
>> 
>> 
>> Pasi Kärkkäinen wrote:
>> > 
>> > On Fri, May 28, 2010 at 02:45:04AM -0700, Fantu wrote:
>> >> 
>> >> Server is Dell T610 with last bios (2.0.13)
>> >> Dom0: Lenny 64 bit, kernel 2.6.32.13, xen 4.0-rc1
>> >> Kernel is last commit of jeremy git xen/stable-2.6.32.x with this
>> config: 
>> >> http://old.nabble.com/file/p28704783/config-2.6.32.13 config-2.6.32.13 
>> >> lspci -vvv:  http://old.nabble.com/file/p28704783/lspcivvv.log
>> >> lspcivvv.log 
>> >> dmidecode:  http://old.nabble.com/file/p28704783/dmidecode.log
>> >> dmidecode.log 
>> >> dmesg:  http://old.nabble.com/file/p28704783/dmesg dmesg 
>> >> lsmod:  http://old.nabble.com/file/p28704783/lsmod.log lsmod.log 
>> >> xend log:  http://old.nabble.com/file/p28704783/xend.log xend.log 
>> >> menu.lst:
>> >> title           Xen 4 / Debian GNU/Linux, kernel 2.6.32.13
>> >> root            (hd0,0)
>> >> kernel          /boot/xen.gz dom0_mem=2560M
>> >> module          /boot/vmlinuz-2.6.32.13 root=LABEL=root-backup2 ro
>> >> nomodeset
>> >> module          /boot/initrd.img-2.6.32.13
>> >> 
>> >> The server run 12 domU windows xp with gplpv 0.11.0.213, all work
>> >> On dom0 blktap not work (write about in other topic) and i must chage
>> >> domU
>> >> disk from tap:aio to file, is one or the problem about performance?
>> >> With not set of dom0 memory and dom0 balloning have "freeze" with last
>> >> msg
>> >> calltrace about out of memory, i set dom0 memory in menu.lst and
>> disable
>> >> dom0 balloning, is necessary more ram that 2.5gb for dom0?
>> >>
>> > 
>> > You really don't need 2,5 GB for dom0.
>> > Start with 1024 MB. You might be able to go down to 512 MB or so.
>> > 
>> > It really depends what kind of tools you run in dom0.
>> > 
>> > Also remember that file: driver for guest disks uses dom0 page cache,
>> > so it may appear that a lot of dom0 memory is used when using file:
>> driver
>> > since dom0 page cache will use *all* the free memory.. so increasing 
>> > dom0 memory just makes you use more of the memory as cache.
>> > 
>> > You really should get tap:aio: working instead. But I guess you open
>> > another
>> > thread about it.
>> > 
>> >> There are some option in .config of kernel wrong or not good?
>> >> with c state option in bios enable system is inusable, now i disable
>> it
>> >> but
>> >> this is kernel, xen or bios problem?
>> >> 
>> >> I hope this information helps improve the kernel and xen, tell me if
>> need
>> >> another information
>> >> 
>> >> Thanks for any reply about my questions
>> >> 
>> > 
>> > -- Pasi
>> > 
>> > 
>> > _______________________________________________
>> > Xen-devel mailing list
>> > Xen-devel@lists.xensource.com
>> > http://lists.xensource.com/xen-devel
>> > 
>> > 
>> 
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>> 
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