Re: [Xen-devel] Low performance and some problem with kernel 2.6.32.13 and xen 4.0-rc1

[Fantu <fantonifabio@xxxxxxxxxx>]

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

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 KÃrkkÃinen 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@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
> 
> 

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